MrFrizzy Posted September 7, 2021 Share Posted September 7, 2021 Near the start of the year, I migrated from multiple machines down to a single Unraid 6.9.2 box with storage, dockers, and VMs. Since day one nothing has gone well or smoothly and I have consistently ran into performance issues, lockups, devices missing, etc. It has taken many months to resolve some of those issues after a lot of digging and trial and error, but I am frustrated and tired of working on this. This is my first Unraid build. That said, I am hoping I am just overlooking something or not using the right keywords when searching around. The current issue I am trying to resolve is that I am running into performance issues with the various SSDs in my system (nothing with the HDD array). Currently I have: (2) 500GB Samsung 860 EVO drives as the cache (btrfs) (1) 250GB Samsung 860 EVO drive as an unassigned device (ntfs) I primarily run a Windows 10 VM off of the cache drive and have the 250GB unassigned SSD shared so it is accessible to the VM. What I am finding is that I cannot seem to get good read or write performance when moving data between the two drives. I am doing large, sequential reads and writes but I get anywhere from 10-80MB/s, not the 110MB/s I would get if it were a network bottleneck or the hundreds of MB/s I would on bare metal. I get better speeds reading and writing to the HDD array than I do between two different SSD-based drives. Another thing of note is that the VM starts getting very slow and laggy when doing these file transfers. I have seen some people say that going with XFS on the cache drives gives much better performance, but I haven't seen much in the way of performance with btrfs. I don't want to go through the process of moving everything off of the cache, rebuild the cache with XFS, and move everything back again (multiple dockers and VMs). I don't want to passthrough the 250GB SSD to the VM as I need it accessible to the other VMs and computers on my network. Thoughts? Quote Link to comment
itimpi Posted September 7, 2021 Share Posted September 7, 2021 It might be worth providing your system’s diagnostics zip file (obtained via Tools -> Diagnostics) covering a period where you are seeing the issue to see if anyone can spot something that might point to an underlying issue? Quote Link to comment
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