Unraid cache drive reddit. Shutdown the server and replace cache drive.

Unraid cache drive reddit Run mover again and let it finish. Backup your cache drive and tune off the array. From the date center drives, they are rated at 60 drive wipes per day compared to 3 for normal NAND ssd’s. Edit - I have just been through the fix common problems and unbalance plugins to move the mediaserver share data off of the cache drive - it seemed to transfer for 38GB but within unraid the drive space has not changed at all, no changes to function of the array. I shut it down and removed the second cache drive and booted back up, then the GUI wasn't loading. So until 6. The problem is I still have 45GB on the cache drive. Don’t do a move just in case it messes up you have another copy. Having a share storing your Movies set to cache-prefer will cause mover to try and move as many large files as possible to the cache drive causing it to fill up, causing more issues. the Dynamix SSD Trim plugin will only work on cache drives. this is also one of the main reasons why ZFS is dumb in home servers. If you pop in 2x250GB drives. Unless you need that extra HDD maybe shrink the array by one drive, keep the cache and then upgrade to the next licence up when you need to grow the array or when you've got the money From this I gained the assumption that a single copy (I was using rsync to copy the 12TB directory tree to unRAID) will not switch drives mid copy, but if I had a full cache and initiated a new copy that it would then go directly to the array. divvy it up anyway you like. Right now, the NVMe isn't being used because I don't have the pool/cache enabled (I'm running unRAID from a USB flash drive, as I have been doing with the old servers I mentioned), as I'm filling the array with files which are currently on a bunch of external USB-3 drives (ranging in sizes from 500GB to 20TB) and I didn't want the extra step of I run my mover pretty frequently so I'm fine with having multiple small-ish cache drives to ensure saturating SATA isn't a concern, I have 2 500gb SATA SSDs in my cache pool, they split the load pretty evenly of VMs/Dockers/tmp storage/write cache functionality and makes sure I don't get caught with my pants down if one spontaneously just dies. Save, Apply. This data was from a mass download of updating old media content. This server ONLY hosts Emby, Openvpn and a Minecraft server. One for standard mover cache and one as a unassigned device just a specific docker that needs to read write a lot. For cache you want a drive with write endurance, MLC (Samsung 860 pro) not TLC (870 EVO). But I haven't found this exact scenario. if you use btrfs (the unraid default) you can just slap in a second drive and it will raid 1 it automagically. The NVMe drives I have are for VM, Docker and some other stuff and I don’t bother with write tolerance. I believe cache drive must be empty (so do this before enabling Docker and VMs) and array stopped. 2 slot, and therefore I will only have one nvme drive as a cache drive. I just want to make sure Plex is the only thing that used that ssd. Check out setting up a cache pool using both your NVMe drives. Bought a ton of used 7200 RPM SAS drives tested the shit out of them and kept the best ones. As a cache drive it's almost never fully saturated as my Unraid build uses 2. I'm not even generating a lot of data or transfer much. So I'm trying to get a handle on this again. Copy the Plex appdata folder to new drive with krusader. Total newbie here so forgive me if this is common knowledge. I am building an unraid server right now and I am trying to figure out how to setup my Cache Pools. I added another cache drive last night after finally getting my other one to show back up and booted the server up and it was stuck starting the array for a while. Now that you can have multiple "cache arrays" on unraid, can use a SSD-Cache into a separate array for the "system" folder (unraid configuration), appdata folder (docker configuration), VMs and the like (but I would create YET ANOTHER SSD array for the VM and not co-mingle and "compete" for bandwidth with the docker userdata). from the Unraid manual: With a single cache drive, data captured there is at risk, as a parity drive only protects the array, not the cache. NVMe/SSDs can only be used as cache in Unraid, so you’re kinda of mixing it up in your questions. Diagnostics in the forum thread on unraid, because i don't know how to upload the zip here - HERE. Move everything over then format the other one. I don't think you'll get any write speed benefits compared to a 2 drive mirror, but in theory you should get a read speed increase since it can technically read from 4 drives. It's definitely a performance v. what you have is a situation where you just need to get off the freetard bullshit and start keeping everything on the solid state drive. It's not set up that way by default. Discord Feb 15, 2020 · Hi, Today i merged my unassigned SSD/data back into the main pool, and now have 2x 1Tb drives in a SSD cache pool for a 3x 4Tb HDD array. But the cache is suppose to be temporary without much safety backup. According to the web GUI, I'm using 166GB. NVMe is your cache drive (or cache pool) and App Data should go on it. RAID 1 mirroring will set the new mirror drive to the same size as the existing. Started up again and after it auto re-balanced it all looks good finally. Planning to build my first ever unRAID server and doing my research, I have few questions on how the cache should be set up: From what I gathered, the cache is used to increase the write efficiency by writing to it first and then moving to the disk at a later time. Go to Main, this is where the picture comes in handy, put your array disks back into the proper slots (make sure it is correct, especially the parity drive) increase you cache to 3 slots, put all three ssd's in, click on cache and define the 3 as zfs, raid0 or raid z. I’m located in Europe, more specifically the Netherlands. 'Yes' if memory serves means everything is stored on cache first if there's space and then the mover will move it to the array. As others have stated, the advantage with #2 is that the cache drive is usually a SSD, which is much faster than the drives in the array. My cache drive has filled up before - especially if there are a lot of media files being downloaded. Twitter. This happened to me a while ago - no reason, no cause. Then change the cache setting to 'no'. Primary use will be software dev on windows vm. 2) cache drives for my Unraid server. Hey guys, I'm having an issue with my cache drive. My cache drive is maxing out to 100% usage and just sitting there while the array spins all the array drives up to use them until I manually click on the mover. I added a second SSD cache drive to give my UnRAID today in the hopes of bumping up the space then realised it was by default mirrored to RAID1. Doing my weekend upgrades/updates and I am upgrading my 2TB Cache drive with a 4TB Cache drive. This freaked me out, then I noticed that my first cache drive was listed as "Unmountable: No file system". I’m upgrading my cache drive from an SSD to a NVME drive. I would be interested to hear if that is correct/incorrect as I see some comments indicating otherwise. So basically question is - use 1 TB nvme or go for 2 SATA drives? Any benefits of using NVME drive for cache (no VM's there), like faster data transfer to the array for example I want to keep VM's at separate drive. Plex, MariaDB, InfluxDB, AdGuard, Grafana, etc), VMs and my cache for my array will reside. This is incorrect. * or lower, full SSD arrays are not supported It is not that it won't work, it is just bad practice. One drive failure, all data is gone. For example, I use a cache pool of mirrored Inland 1TB NVMe drives for appdata/domains/system shares. I use the server for automatic media management (with the arr's & hardlinks), also some VM's, backups of our pc's, and some docker containers. Say before the data can be moved from the cache drive to the array it's not protected unless you have two cache drives setup. From what I've read, compression actually improves read & write speed. The server will contain 6 total drives, 12TB 7200rpm as the Parity drive, and 5x 8TB 7200rpm drives. Then go raid 1 again? Also is it worth it to look into just reformatting the drives as XFS and staying single drive until unraid 6. Then the data gets automatically moved to the array when Mover is invoked (can be manual or on a schedule - see Mover Tuning plug-in). I currently have appdata and system shares using cache as "Prefer" Most of the other drives either have data storage or are media drives for Emby. I just replaced my cache drive. As a NAS, it works wonderfully. Any suggestions on how to fix that? Yeah, as did I so I started on basic then upgraded to the next tier and again after that as I moved to machines with more bays etc. You can set all the shares that use the cache to 'prefer' and then give it 12-24 hours (to be overly cautious) to copy all data to array I have a 1TB Cache drive that has about 800 MB of data on it which 700 MB is media files used with Plex. I know enterprise grade SSDs are what a lot of people prefer. Second thing is how the parity system works. 9 we can now have numerous cache pools. 10 votes, 16 comments. Unraid Forums. Now, that probably explains the 180GB pool size. I then was planning on picking up a 1TB nvme ssd as the cache drive. Hi - I've found guides for adding a second cache drive to make a RAID 1. (link… I've had my unRaid server setup for a couple of years now, but pretty sure I setup the cashe drive wrong. This unassigned drive gets copied to Google after the weekly backups. Provides about 15TB of cache. I set it up on an old decommissioned server rack with 12HDDs and no cache drive. If I run btrfs filesystem usage /mnt/cache, I see the 155 GB used. It's currently moving the appdata folder to the array, about 15gb so far, and I was able to start my docker containers back up. Just add the second SSD to your cache pool. Remove the failed cache drive Start the array. Do i need a Cache Drive? Currently got 2x 10tb WD reds as parity and one 10tb Ultrastar as data. Important data ? If the cache crashes, what is the issue? Unless you can't have another one, you should backup important stuff directly to the drives, without using the cache. Run the mover. That means your drives will give you a 500GB mirrored cache. Set these to move the data onto a different pool or the main array. The drive looks fine when the array is stopped, it lists it's file system as BTRFS, it can be selected as a cache drive and URAID says "Configuration valid". I stopped the array a 4th time, set slot 2 unassigned, and set the NVME to slot 1. I have a bunch of enterprise SSDs but none are NVMe. I have a spare 500gb ssd should I use this for the cache drive and use the nvme just for plex appdata and how do I transfer stuff to new cache if this is the way to go. I want to make Plex run faster at the least. (I juste receive my cache drive today ssd nvme 500Gb) and i will soon invest in a parity drive. Thier performance isn't great, but its still better than a HDD. I haven't figured out a way to benchmark it, the DiskSpeed container doesn't work with cache pools. The issue is what else is going on the cache. For 1TB under $150 is tough, search for used intel DC drives, consumer drives are generally rated for well under 1 write per day paying more for the enterprise drive is cheaper in the long run. Ironically, I've had bad luck replacing one drive when the mirror fails in my cache - again probably due to my cheap drives! Twice not, the second drive has failed as soon as I replace the 1st - therefor losing all the data on the cache. Running df -h command shows the size correctly. Keep in mind, cache is not covered by main array parity. The "Mover" then will copy them to the protected array at a time/interval you set. Verify your cache drive is empty. I am planning on making an unraid server; I've bought all the components I need so far (case, motherboard, CPU, RAM, PSU, HDD's) except for an SSD cache drive. The correct steps include changing the share to prefer cache, run the mover, then changing the share back to cache only. I do keep a good backup schedule, but don't like downtime in case my cache nvme drive decides to fail. Cache is faster at writes, so if you are running apps/VMs, you don't want them running directly on your protected shares. As well as my array hdd drives, I have 2 drives samsung 980 pro nvme pcie 4 and samsung 870 sata ssd, both 1tb. Are there any particular enterprise grade SSD's that you prefer? Sep 30, 2024 · Unraid is a linux based operating system that allows you to create high capacity data and media servers. you get a 250GB cache drive, slower than a single drive would have been. I didn’t realise they would be used in a kind of Raid way in using both making only 500GB useable. I also use duplicati to copy my Backup/Restore AppData plugin directory to an unassigned device drive. Still full, still locked. Had a mind for data2 but will use as cache if thats worthwhile. My SSD cache drive is at 37ºC when idling, but 2+ times each week I get a temperature warning for a couple hours that the cache drive gets above 48ºC. 12 rolls out then go back to raid 1? Once I realized it the Plex appdata folder was the culprit, I changed the appdata share to "yes" cache, so that I could invoke the mover, and free up space on the cache drive. And RAID 0 has no redundancies. By default, the mover service runs every night. Make that the new cache drive. Luckily I was using the CA Appdata backup/restore plugin. I would say in 2023 there is no place for a DRAM-LESS SSD drive. Say you set that as your cache drive and set the cache minimum free space to 32 GB. You have four options, you can: use the CA Backup/restore Appdata and VM utilities to back up the data and restore it. On Unraid 6. It was literally causing people's drives to fail early. I'm not sure what you plan on running besides Plex, but if thats it, you'd probably be fine with 2 x 500GB cache drives, running in a RAID 1 for redundancy (If you do BTRFS, I believe it defaults to RAID 1 with 2 cache drives). Still new to unRAID but are your appdata locations for your docker containers set to mnt/user/appdata or is it mapped to cache mnt/cache/appdata, I believe the latter could cause your containers to crash as they can't see the data moved to your appdata share which moved to the array, since it's only looking at the cache drive specifically. I use 2 500GB nvme for my cache pool in raid 1 for the redundancy because all my dockers are on it. That means that if your Cache is set to XFS (which is the default for single Cache drives) then you won't be able to just add the new drive. Shut down the server and remove the old drive. You'd get rid of unraid and just use Windows server. If your download and appdata are on the same pool, huge I/O writes will lock up your server. Why did you opt for cache, rather than array drives? From what I've seen, the cache drive makes writes a lot quicker (if it's an SSD), but only really helps for reads if the items (dockers/VMs in this case) are stored on there, but that would remove them from the array, and therefore wouldn't be parity proteted. I am new to unraid and I'm trying to figure out what the best SSD would be for a cache drive. Anytime I tried to format and partition cache to xfs, it would revert back to btrfs. security tradeoff. I wanted to add a ssd Cache drive to be used just for plex, but unsure how to do it. Change your share settings back to what they originally were and run the mover. I use two 500gb cache drives like that. I had more than a 30MB/s of writes with all of my dockers stopped with that bug. This is for my dedicated plex/nextcloud running all the *arrs torrent & nzb server that im running PNY 128gb ssd now but want to switch to nvme drives for more speed and space. Same, I switched XFS because of the cache write bug in 6. How can I get this storage back? I recently had an incident where my cache drive filled up completely, and it's been this way since then. As for Raid1 config in Unraid/BTRFS, it really means that all files will be stored on two separate drives. Stop VM Manager and Docker service - set all shares to "Cache to Array" and then run mover. Not ideal cause it cause wear on it. These drives are endurance rated up to 1600TB written. Wait until it mirrors all the data to the new drive. When I had /data set to "/mnt/user/downloads/" with cache disk off, I would get 50 MB/s download that would crawl to 5-10 MB/s when too many things unpack. I copied off my /appdata, /system, /domains folders, and then copied them back to the new drive (still has the same "Device Name"). You probably want to set your shares to yes rather than prefer. At this point, I see no reason to get anything less than 500gb anymore as the cost difference between 500gb and The best cache drive will be dictated by your particular use case. So then I stuck in an old 256gb NVME drive I had sitting around and got that I ran a scrub, but it immediately cancelled. So I have a slighty odd cache setup. The Yes setting means to use the Cache drive as temporary storage until mover is run. It works great with my dual NVME cache pool. The downside is that if you're writing a lot of data, it's not going to be as fast as an SSD with DRAM. Downloads will go to the cache drive first, then get moved to the hdd array via schedule. But at the time, I didn't know much about NAS solutions and unraid was fairly easy to set up and configure, so I went with it. Shutdown the server and replace cache drive. Enabled both drives as cache and had to run balance option for system to see drives as RAID1 instead of 1TB RAID0 (512GB drives). Your movies / tv shows should be in a different Unraid share that is usually set to "Yes : Cache" which means the files are placed in the cache first when moved to the Unraid system and then moved from the cache to the array when the mover is invoked. I run two 250GB SSD's in BTRFS as a cache. Depending on how unRAID reads and writes to the pool, in theory, a 4 drive cache setup in raid 10 should get some performance benefits vs a 2 drive mirror. Why is the mover filling the cache to such a degree and then emptying the drive? I was under the impression that the cache drive was just to make perceived write speed Im building my first unraid server. . SSDs normally get hotter than HDDs, so I have the ` Warning/critical disk temperature threshold` set to 65/70c, but I keep getting warnings anyway at 55. It was basically duplicated, a copy was on the cache and also on the array. There should be a drop down for File System Type. Example: I have: (2) 1 TB SSD drives If I set these two identical drives up in a Cache Pool, as an example: Cache Pool: Name: Plex App Data Slots: 2 When you set it to 'no' and there's data currently on your cache drive, Unraid does nothing. I resolved myself to wipe the cache drives (in RAID-1), and start over. This setting also affects mover behavior. 2 drives? Cache --> array for every share except system, appdata and domain. Hopefully that is correct - going from memory. I keep getting temperature warnings about my cache drive (4 ssd raid). You only have to do that for the shares that exist on the Cache drive. But if that's all you have, that's all you have, it's better than nothing. Appdata is on cache. Anything on the cache is not backed up or even has parity. Been using unRaid for about 2-weeks now. Move data back to the cache. My last backup of the AppData share is from 12/21, so that’s manageable but not ideal. Also I have two 1TB NVME SSD cache drives in RAID1 for my Docker/VM and two 1TB SATA SSD cache that I use for my Downloads/Shares. 12 is released, I have 1 cache drive for appdata that is btrfs and 1 for downloads that is xfs. Cache size would depend on how much you are downloading, or how much you plan to store on the drive for VMs and Dockers. To make a long story short, I feel like I made a mistake going into unraid for my NAS. Basically using 2 SSDs together as 1 cache drive. How should I proceed? Thx I’ve been tinkering with unRAID and so far have been pretty happy with it. If I didn't do this, I would stick with the default file system for the cache array, which I believe is btrfs. My current setup is the NVME is the Cache drive, and I set up the 2x SATA drives as a mirrored pool. If you can get a good deal on the higher capacity Optane modules, they would be fine but I don’t think many people will write 1. For me it’s not worth it. When you state, "After a few hours my cache drive kept filling up", what does that exactly mean? Here's a summary of my experience trying to do this : I had a 128 GB cache drive that I wanted to update to a 1 TB NVME. After playing around for a few weeks on a test server i'm going to be installing UnRaid this weekend on my real home server. Lime Technology Home Page. That will take everything off the array and move it back to the cache drives. I use Duplicati to backup Nextcloud files to an Unassigned drive once a week. The guide says the drive should be empty after mover. I believe back then since we could only have one cache drive that Unassigned was used for apps/VM's. When the array was stopped, I tried to mount it, but mounting failed. So in reality, the data on the cache drive is in danger of being lost until moved off the cache drive to parity protected storage drives (assuming you have parity drives). I do use zfs on my cache drives, because every night i do snapshots and replication to the 1 zfs drive in my array, which is then also protected by parity. However, you can build a cache with multiple drives both to increase your cache capacity as well as to add protection for that data. Afaik, if your cache drive is an SSD, you will not be able to retain the TRIM functionality and your SSD will degrade faster as a result. That will take everything off the cache drives. QUESTION: How do I find out easily what files on my cache are taking up space on my cache drive?----- Hello all! My cache drive has been repeatedly filling up, I am not downloading anything, I am however: generating thumbnails in plex (this is done, I moved the files and 76GB was 'freed' up I changed my Media Share to use cache: no, and am Worst case scenario in that situation is you move the app data folder to a share on the array, then point all your dockers and/or VMs to the new location and run it from there for a week until you can have a new drive swapped in and move everything back to the new cache. The bigger problem is that it does not handle very well a situation when it's bombarded with multiple reads/writes at the same time. When you switch to a Cache pool IIRC the default Filesystem is BTRFS. First thing is the lack of TRIM support. When you assign them both to the cache pool, unRAID will automatically create a btrfs RAID1 pool. Prefer looks to move data from the array to the cache drive. My cache drive is using btrfs. If files are on the array, and the share is set to cache only new files will be created on the cache drive, but the files on array drives will stay where they are. Double-check that your Cache drive is clear. I followed the above instructions and it seemed to work well (BTRFS copy was successful) but instead of simply unassigning the drive (and keep the slots to 2) to let unraid rebuild the cache, I changed the the slots to 1, which caused some issues. Unraid will assume the drive failed, then add the new larger drive to your machine and replace the failed drive. As just a regular drive for other purposes, like a VM. If you're doing a TON of writes you want SSDs with the highest write endurance possible. If you've got an empty cache at the moment just take the old drives out, put the two new ones in and configure as raid 1, make sure all shares are set to use them as a cache pool and then change settings for any shares you want to be on the cache to "prefer" and invoke mover, then start VM/docker services. Just be aware that: The mover can't move files that are open in something like a docker process. (and turn off array auto-start if you have that enabled) Shut down, replace cache drive. Let’s take your 232 GB SSD as an example. Unraid Blog. Start back up, format the Cache drive and then set the Shares back to cache drive were needed. I suspect you had shares that were set to Only, or Prefer which would prevent mover from moving the data. My mover settings are set up to move every morning starting at 4 am. On main page, under Cache Devices click 'Cache' to open settings for that drive. 9 but I never switched back. Dumped some large groups of files off and on to the cache pool for a while and was quite pleased with performance and of course lack of issues. It just seems to be ignoring my temperature settings for that drive. Yes will write to the cache and temporary store files on the cache until mover runs and moves the files from the cache drive to the array. Which means you would have enough RAM available to store all of your stuff for the containers, have something for everything that is running on your unraid, unraid If it's writing to a share that has the cache drive enabled, the data after the drive fills up will write directly to the data disks and calculate the parity as if a cache weren't present. Currently, I run Plex on a laptop and have an 8TB hard drive (that I will shuck into the server) plugged into it with all of my movies, TV shows, and metadata on it. I’m using unRaid since 3 month now. (not unraid specific) Yes you can. Switching over to new cache pool was very easy with zero problems. For the moment my storage setup was 2 x4TB disk in my array with no cache drive and no parity drive. Ones that can sustain 1250+ mb/s writes no matter the file type (small or large). I won't build a cache pool without it being a mirrored pool. Change the previously modified shares back to cache only. Then you can remove the original drive one the RAID1 is rebuilt. They are cheap DRAM-less drives. I have a 256GB Samsung 850 Pro SATA SSD drive just for the the mover to exclusively use as a cache drive for the array, separately i have 500GB Western Digital 2TB NVME drive I'm planning to use for my dockers and VMs. the only way to expand ZFS pools is by doubling the drives you already have in a single go. So far I have used a mover criteria of 'move when a file is older than 14 days old' so that at worst I lose 14 days worth of files, but a tradeoff is that I am only using ~5% of my 1TB cache drive and my array drives are spun up more often than would be necessary if I were using say 75% of the cache drive capacity. Does Unraid have any known issues with U. It's a single SSD formatted in XFS, what is the best way to perform that swap? Per all the articles I've seen, it requires the format to be BTRFS. 5TB/day everyday for 5 years to a NAND cache drive on unRaid. 10. I write maybe 20GB to the server on a heavy day. Reportedly this bug is not fixed in any upcoming release. A plex docker doesn't require much storage, as the bulk of the data will be the movies/tv shows on the main array. But, it has the green circle next to Device column. I would like the drives to be less than €45 each and I don’t really care about capacity, as long as it’s 256gb or more. I've recently moved around files on my array and cache (unbalance) to encrypt all the drives, includes cache. Setup a separate cache pool or unassigned device. Re; drive format… no idea. What i'm trying to work out is the best cache settings to use, whilst also minimizing HDD drive-spin up, and SSD write usage too (obviously depends on the apps Nov 6, 2022 · There are 2 major uses for the cache drive: Speed up, uploads to the server. 8. Never figured out why. Do I add another cache pool or do I just keep the drive as an unassigned device. 5 GbE. If you have files you need encrypted right away, you can set specific shares to not use the cache drive and therefore always be encrypted. If I just run du -sh * on /mnt/cache, I only see about 79 GB used. Also, cache is only used if you have the shares configured for it. Then reverse the process; Delete and rebuild the pool as you need Put the share cache settings back as before Run Mover again The data resides on the cache drive until the mover service moves it to the storage drives. Go back into the shares from before "Use cache pool" to Prefer, then run Mover and things will get moved back to the cache drive. Now replace your cache drive and power back up. Except now I know how it’s used. The overall process of replacing a cache drive looks something like Make sure the cache is setup in RAID1. Yeah you could do 1 cache drive with appdata and system files, then another cache drive could handle bit torrent stuff, and so on. I have evoked the mover several times and the data does no move off. Reply reply OK, so on the unraid manual, under cache pool operations, it states that the cache pool is raid 1. When unRaid started out, this was a problem as people with slow disks were seeing quite slow write operations to the array. Ever since i upgrade to 6. And if you want more speed do 2 SSD drives in either Raid 1 Mirror or Raid 0 Stripe. (to replace one of my cache drives I had to evacuate my cache entirely, destroy the cache pool and then build a new one with the desired drives and then set shared to use it again) How does unraid know which disk to build the array from? There’s no such thing as a “data” or “parity” drive when it comes to a cache pool. Yesterday, the drive dropped from the system, and doesn’t show up when I run “lspci”. However, if you plan on running any dockers or VMs, it is always nice to have a cache drive for their images. In simple terms, with a cache drive configured, data is written to the cache drive, and copied to the array automatically later (maybe overnight). However, I was wondering if I should flip this and make the Cache pool be mirrored and using the SATA drives, since I think the SATA drives will handle the constant writes of the Cache position better than the NVME drive does. I have a replacement drive sled ordered to test with, but in the meantime I have to assume my cache drive is dead. I have never had this issue happen before, so unsure why it started happening now. I would like to swap out my smaller single cache drive for two larger drives. I did have to reformat the entire drive and restore all my appdata though. Hi all, Currently my Unraid system is running with a XFS cache pool for all my dockers and VM's. I was using btrfs for my cache drives, but there is apparently a long standing bug with the btrfs file system and cache pools. Unraid's mover takes care to move files back and forth between the cache drive and the array. The tooltip for the settings explains why you need to do this. This seems to have been fixed on 6. I’ve come across the cache and at first figured for the load I use it isn’t all important. And then the cache drive was used for downloads/files transfers. 3 last night I keep getting alerts that my cache drive is overheating and then returns to normal. What's the best way to clone the existing cache drive + add mirror? I have 4 drives in my cache (500, 500, 1000, 2000; Raid1 config) and mine shows 2TB available but the used/free never add up to 2TB. I just upgraded my UnRaid server Motherboard to a Gigabyte Z690 AERO D. Then restart VM Manager and Docker Stop Dockers / VMs and switch the shares that are cache::Only to cache::No. So if that SSD was to fail and you only have one cache drive that data would be lost. Official Links. Or better take NVME as unassigned for the VM's and SATA for the cache? (downloads and dockers) Go into the settings for the relevant share and adjust the setting for "Use cache pool" and "Select cache pool". If it’s worth it is entirely depend on many other factors. So if you lose a cache drive you still have all the data that is stored on it. Years ago, Micro Center had a deal for 120gb SSDs for $12 each. I believe we can just create a pool and use that to replace the old Well it seems I had left cache drive slot one empty, and running the NVME drive in slot 2 wasn't playing nice. I followed the steps outlined in the unRAID Wiki (I’m on step 4). The rest of the array drives are xfs. Ages ago when I built my Unraid build (which is working fine but due an upgrade) I installed two SSD Cache drives thinking the whole amount would be usable, which in my case would be 1TB or 1000GB as I installed 2 x Samsung SSD 860 Evo 500GB drives. Is it possible to do them one at a time say go from raid 1 to single drive, format the orphaned drive. Change the setting to 'yes' (non-intuitive, I know), turn off all your dockers and VMs, and then run the mover. this mean that as your drives get used they will lose performance. Curious what other people are using in their system. While I can't help you by answering the question, I don't think this is the right way to do. Here's the main text for how cache works per share: Specify whether new files and directories written on the share can be written onto the Cache disk/pool if present. I cache all my large files to 10*3TB SAS drives. Thankfully, I took a backup of the cache first, but both times it was a pain to restore. But with unRAID 6. Then run Mover and wait. If you go into the share settings and click on the cache text it should explain what each one does. Never happened before and looking as it now its only 83F so its seems to have these odd spikes that don't last long and then back to normal. I can see I can convert it to RAID0 but was wondering if I can do that live without moving everything off the cache drive? Use multiple cache pools (preferably still with redundant raid1 like you have mow6, don't forget yhings live on cache or array, not both, and your parity disk does not protect cache, while new things go on cache and are probably only backed up once per day, or not at all for many people) and assign different pool to different share. Unraid will move everything with the cache 'yes' setting from your cache drive to your array. Fix / reformat cache drives. Finally added an SSD 480GB drive to Pool Cache drive. On black friday I bought a second nvme ssd to run my cache in mirror, only to I have an Unraid server running 7 8TB HDD's + 1 8TB HDD as parity. Stop the array and power off your server Add your new cache drives Power on your server and add the cache drives to the array Start the array, enable docker and re add your docker applications Enable backups of your dockers. VM's fired back up no problem, but when I restart the Docker Service it shows no containers installed. I don’t use a pool but believe it is what you’re looking for. I currently have 2 older SSDs that one is a cache drive that my appdata folder sits on as well as my Downloads folder. Wondering who has installed these drives in their unraid servers and which one would you recommend. Also: Unraid has this thing about mirroring your cache drive, too. Start it up, assign the new cache drive (and format it if necessary). In my case, the appdata of my containers is 24GB. As temporary storage sitting in front of the array. Got like 2 virtual cache drives that originate from the same M18 SSD. The benefit to running dual cache drives is you get a second copy. I was using the BTRFS file system on the cache drive, switched over to the XFS file system when it died and haven't had an issue since. Is there a way to put a SSD cache drive as xfs? Please note I'm on the latest stable release, not the beta. The cache pool setup I planned would be a Raid1 (zfs) with 2x 4TB NVME SSDs, on which my Docker AppData(ex. I have done this, but there are still items from 'appdata' and 'system' shares on the cache drive, presumably as the system is using/editing files in the general running of the server. Here are some of my learnings: Unraid doesn't automatically store logs between reboots. Another thing you might consider is to just leave your ssd/an ssd as an unasigned disk. My primary concern is speed of the server as a whole when doing file transfers. So I set up Unraid last weekend without a cache and discovered that it's outrageously slow. Stop Plex Container. So when you don't already have your Cache pool on that filesystem, it would have to be formatted so anything that is on it will be lost. If, however, you're writing directly to the cache disk, the write operation will fail once the drive runs out of space. But, on the Main tab, the Pool/Cache entry says "Unmountable: No Pool uuid". I'm going to be building my first unraid server this weekend primarily as a plex server, but also as a NAS. I finally got everything back up Since you may be wondering why I'm using a 4tb HDD as my cache --- I'm fairly new to Unraid, and I came from five years of running Free/TrueNAS which didn't use a cache drive. Currently my dockers and app settings live on an old data disk. I'm guessing since it's using your CPU for that and well, for modern CPUs that kind of workload is trivial. I think most is from Plex, but I have other appdata folders as well. And while you're there you could also check out user and user0 folders, user0 is without items on the cache drive. I’m looking to get an NVME to use as a cache (1Tb). Would like your guys opinion on these drives. Apr 4, 2013 · If you use a cache drive (for caching) then you can enable the cache drive for that APPS directory that is limited to one drive That way: - all drives are spun down besides the APPS drive and the cache drive (parity drive is also spun down since the cache drive is used); Another thing to note is that the size of your cache pool determines how big of a single file you can write to your cache enabled share. Have a space for another drive. Thinking of replacing the 500gb with a 1 or 2tb ssd. Set the Minimum free space of your cache drive/pool to the "largest" file you may add at one time. I've never understood why this is the preferable default behavior. Intel Optane has insane endurance. Start the array without the old dive in the cache pool. true. Some gaming and some docker use. The usual setup is to have /data use Cache “Yes” so that writes are to the cache pool and things like Plex processing happen on cache drives instead of slower spinners. Stop array, un-assign cache drive. Add the new drive to the cache pool. Most days I do not even write to it. I am migrating my 'Unassigned devices' to Cache Pools, so far it is a great improvement! I can't believe I did not know about Cache pools earlier. Yes, it's btrfs. I would suggest setting your cache drive to enable drive shares so that you can view the contents of the cache pool, and compare it to the location that you intended the mover to move your system folder to. 8 unraid builds. When deduplication can save 75 to 90 percent of the space associated with VM, you're not having a capacity or a cache drive issue. It get warm pretty quickly, as it's located on the back of the mainboard so I had to install an heatsink. Which should i store my vm images and which should i use as data share / cache. Currently I've got a small cache drive 120gb ssd, and have the following folders setup: appdata- prefer Data (main downloads folder) -Yes system-prefer domains- no isos-Yes timemachine - no Should I be setting up the cache any different? I'm running a handful of dockers minecraft server node, no VMs though. A RAM Disk, is as the Name suggests a portion of your physical RAM inside of your server/PC. I am about to get my hands on QTY 3 of 2 TB Samsung NVME drives. Plug in the SSDs and create a cache pool while the array is stopped. Remove one of the RAID1 cache drives. Every night I get notifications telling me that my cache drive is low on space (98% full). Thankfully I had backups which don't appear to be corrupted, and on restore, everything is working well. If it died and the last backup was 6 days ago id lose a day of downloaded data, and a week of changes to app data. The NAS is still in its early days of experimenting. Edit the Plex appdata path in the docker config to the new path. You can go back in and readjust to only for the share you want to keep only on the cache, like the vms etc. In a RAID1 mirrored pool, your data is retained. So cache is the perfect "home". but you do need to have more than 1 drive to get it started. The Cache disk was introduced to mitigate this. Store docker/VM files. "Prefer" will place new files on the cache and let the mover move any files left on the Array to the cache. One major factor for me would be power consumption, so the SSDs shouldn't block higher C-States. I have a server setup with 13 disks and 2 parity drives, 1 512gb nvme cache drive. update - Just run a BTRFS Check on the cache drive - Here is the status report [1/7] checking root items [2/7] checking extents data extent[2057591570432, 245760] referencer count mismatch (root 5 owner 5435779 offset 2976559104) wanted 0 have 1 In a perfect world you would have two SSD cache drives in a pool set up to mirror each other. So lets say I back up my appdata once a week, and my cache runs once a day. The mini-itx motherboard I'll be using only has only 1 m. Unassign the 256gb drive but leave the cache pool intact at 2 drives (you'll get errors on restart but that's normal) Restart the array and let the btrfs repair complete, it'll take a couple of hours When thats done, shut down the array again I had 2 cache drive with raid 1 and it started to have this problem where it would just stop being able to write to after a few mins of restarting… Skip to main content Open menu Open navigation Go to Reddit Home I have a 250gb nvme drive that is used as my cache drive but I’m running out of space as I have a large plex collection. The only time this would be a problem is if you download more data than the cache drive can hold before the next time mover runs. To make proper use of it, I want new (m. Also note that while raid 0 sounds nice by "merging" the drives together and have one big drive with the capacity of all drives (sort of), if in a RAID more drives fail than it can compensate, all data is gone. 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