April 23, 20233 yr Hello all. I am currently running Unraid 6.11.5 and have a cache pool of 2 devices in btrfs with 2 nvme drives. I was wanting to remove 1 of the nvme drives so I stopped the array, set the nvme cache drive that I wanted to remove to "no device" (which then moved it to the Unassigned Devices, then checked the box stating "Start will remove the missing cache disk and then bring the array on-line" and started the array. Now, next to my single cache nvme drive it says "Unmountable: No file system". I do see an option under Array Operation Format that says "Unmountable disk present Cache" and the option to check "Format will create a file system in all Unmountable disks". If I do this, should this bring my cache file system back up? I have attached my Diagnostics just in case. paco-diagnostics-20230423-1012.zip
April 23, 20233 yr Community Expert Solution 35 minutes ago, fernandoaleman said: If I do this, should this bring my cache file system back up? No, it will delete all data. According to this the pool wasn't redundant: Apr 23 10:01:50 Paco kernel: BTRFS warning (device nvme1n1p1): chunk 85963309056 missing 1 devices, max tolerance is 0 for writable mount So you could not remove a device, type: btrfs-select-super -s 1 /dev/nvme0n1p1 Then stop array, unassign all cache devices, start array, stop array, re-assign both cache devices, start array, post new diags
April 23, 20233 yr Author @JorgeB Thanks so much! I followed your directions and that seems to have fixed it. My cache pool is now back and all my files are accessible. I have attached the Diagnostics again in case you would like to confirm. What would be the proper way to remove 1 of the 2 nvme drives from the cache pool? Just want to make sure this doesn't happen again. Much appreciated. 👍 paco-diagnostics-20230423-1100.zip Edited April 23, 20233 yr by fernandoaleman
April 23, 20233 yr Community Expert Your pool is mostly using the single profile for data, convert to raid1, check that it actually converted and data is all raid1, then you can remove a device. Data Metadata System Id Path single RAID1 RAID1 Unallocated Total Slack -- -------------- --------- --------- -------- ----------- --------- ----- 1 /dev/nvme1n1p1 - 2.00GiB 32.00MiB 463.73GiB 465.76GiB - 2 /dev/nvme0n1p1 222.00GiB 2.00GiB 32.00MiB 707.48GiB 931.51GiB - -- -------------- --------- --------- -------- ----------- --------- ----- Total 222.00GiB 2.00GiB 32.00MiB 1.14TiB 1.36TiB 0.00B Used 190.15GiB 544.02MiB 48.00KiB
April 23, 20233 yr Author @JorgeB I will follow your instructions to Raid1 so I can remove that additional drive. Again, thanks so much for the help. You saved my day! 🙏
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