May 2, 20197 yr I for some reason thought I could just plug and play 2 more SSDs into my cache pool for storage. I was able to get them installed and mounted, however it didnt go as planned, one of my original SSDs is now saying its unmountable with with no file system present, while the other still says its apart of a pool still. I even tried unplugging the 2 new drives to see if I could boot it up as before, but that didnt help. Can anyone take a look at my logs and see if there is something I did wrong? Thanks in advance! ~Acps unraid-diagnostics-20190502-2237.zip
May 3, 20197 yr Community Expert Not quite sure what happened here, but it looks like all 4 devices where already part of a pool at boot time but only two were assigned, so you re-assigned the missing two and they were detected as new and so wiped, and a 4 device pool can't mount with only two working devices, you might try the options below but have some doubts they will work for this situation: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=543490
May 4, 20197 yr Author 22 hours ago, johnnie.black said: Not quite sure what happened here, but it looks like all 4 devices where already part of a pool at boot time but only two were assigned, so you re-assigned the missing two and they were detected as new and so wiped, and a 4 device pool can't mount with only two working devices, you might try the options below but have some doubts they will work for this situation: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=543490 "mount: /x: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error." Any ideas? Quote Edited May 4, 20197 yr by Acps
May 4, 20197 yr Community Expert 1 hour ago, Acps said: Any ideas? Not really, you can try #btrfs on IRC or their mailing list for more help, since the filesystem was wiped on two devices I suspect the only way would be to manually recreate the missing superblocks.
May 4, 20197 yr Author Ok, well i ended up just starting over, i did have an appdata backup but its from Feb 18, which is better than nothing!
May 4, 20197 yr Community Expert Maybe @limetechcan do something to avoid similar situation happening in the future, i.e., if added device has the same fsid as the current pool device(s) don't wipe it.
May 4, 20197 yr Author I only had like 4-5 dockers installed and no VMs at the moment. I was trying to add 2 more ssds to my cache pool when it got hung up. I unassigned all 4 ssd drives and precleared them, then assigned one to the cache to setup. Now i am working on adding one at a time to the cache pool to see if that will work, then maybe ill try to restore a backup of my appdata!
May 4, 20197 yr Community Expert The problem you had like I mentioned was that Unraid considered that the two pool devices were new devices, when in fact they were already part of the pool, they remained unassigned likely because of the previous crash, this woudn't happen in normal usage, i.e., it's perfectly safe to add more devices to the pool, you can even add several at the same time.
May 6, 20197 yr Author I was able to add them to my pool as raid 0 using 4 ssds in cache pool. Thank you for the help
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