April 8, 20206 yr Hello, Wondering if anyone can help me with an issue I am having with my Cache pool. Basically after a reboot today, when I started up the array I saw the following: Along side this I see the below asking me if I want to format the primary cache drive. Now obviously I do not want to as I don't want to loose data. I then ran a btrfs check --readonly /dev/sdb1 which came with the following output: Opening filesystem to check... Checking filesystem on /dev/sdb1 UUID: ab81d341-8531-4c08-8fa1-645911b301fd cache and super generation don't match, space cache will be invalidated found 310226411520 bytes used, error(s) found total csum bytes: 0 total tree bytes: 90783744 total fs tree bytes: 29900800 total extent tree bytes: 60588032 btree space waste bytes: 16964433 file data blocks allocated: 156191051776 referenced 154714845184 I then did a btrfs check --repair /dev/sdb1 which showed the following: Starting repair. Opening filesystem to check... Checking filesystem on /dev/sdb1 UUID: ab81d341-8531-4c08-8fa1-645911b301fd [1/7] checking root items Fixed 0 roots. [2/7] checking extents incorrect offsets 12845 12358 incorrect offsets 12845 12358 incorrect offsets 12845 12358 incorrect offsets 12845 12358 Shifting item nr 94 by 487 bytes in block 1254219743232 Shifting item nr 95 by 487 bytes in block 1254219743232 Shifting item nr 96 by 487 bytes in block 1254219743232 Shifting item nr 97 by 487 bytes in block 1254219743232 Shifting item nr 98 by 487 bytes in block 1254219743232 Shifting item nr 99 by 487 bytes in block 1254219743232 items overlap, can't fix check/main.c:4336: fix_item_offset: BUG_ON `ret` triggered, value -5 btrfs[0x42f27d] btrfs[0x43842d] btrfs[0x438960] btrfs[0x43950c] btrfs[0x43d495] btrfs(main+0x90)[0x40ecc0] /lib64/libc.so.6(__libc_start_main+0xeb)[0x1473a7ed6e5b] btrfs(_start+0x2a)[0x40ef4a] Aborted So at this point I am stumped on what to do to resolve the issue. I have been able to set the primary cache as no device and then start the array at which point it seems the secondary cache drive is working fine and has all the data I need. However preferably I do not want to run at a reduced redundancy for an extended period of time. If I am infact being stupid and do need to format the primary cache drive to then make it re-sync the raid I can do that. Any help infact would be very much apprriciated. Appologies this post is VERY long, I just wanted to make sure that I covered all the options I could find before asking for help.
April 8, 20206 yr Community Expert https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/?tab=comments#comment-543490
April 9, 20206 yr Author 7 hours ago, trurl said: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/?tab=comments#comment-543490 Okay great that information helped. As I had the secondary cache working and all the data was there I just copied it from the single drive cache pool to the array. I then stopped the array, assigned the primary cache back and started the array. I then ticked the format box and started the format of the primary cache. As expected this formatted the cache pool, so all I had to do is restore the files to the cache and everything was back to normal. Just so I know for future, reading the errors shown can someone explain what happened?
April 9, 20206 yr Community Expert 1 hour ago, Conmyster said: ust so I know for future, reading the errors shown can someone explain what happened? Not without the diagnostics, also careful with btrfs check --repair, it should only be used if told to do so, or it might make things even worse.
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