September 11, 2025Sep 11 I think I've worked out that at least part of the file system on my cache pool is corrupted, and I need to reformat and restore from a backup. Before I go down that path, though, I want to confirm with the community that my thinking is correct and I haven't missed anything else.What Happened:A few days ago, I performed a safe shutdown for some routine maintenance (just removing dust and stuff, no hardware changes). When I booted back up, everything seemed normal until the system started throwing a bunch of BTRFS errors and I/O errors. I wasn't able to grab the diagnostics before I shutdown, but did grab the syslog syslog-20250908-1352.txtWhen I saw the errors, I performed a clean shutdown, rebooted into safe mode, and ran diagnostics tower-diagnostics-20250908-2032.zipand was seeing different BTRFS errors this time. Based on what I could find on other threads related to BTRFS errors, I ran a scrub of the cache pool, which ran with ~6000 corrected errors and no failed errors, but no other issues with the scrub as far as I can tell.Thinking that had fixed the problem, I performed a clean shutdown, confirmed all hardware connections were secure, and rebooted as normal. After booting up, only part of my dockers started and the others can't be started. The syslog is showing a handful of BTRFS errors still, which I'm understanding to be corruption errors based on the diagnostics after the latest reboot tower-diagnostics-20250908-2225.zipHoping this can be fixed with a reformat and restore.
September 11, 2025Sep 11 Community Expert I would double check the SATA cables and/or replace. Might have bumped something loose when cleaning.I didn't see any corruption errors.Also your docker.img needs to be corrected or deleted and recreated. Edited September 11, 2025Sep 11 by MowMdown
September 11, 2025Sep 11 Community Expert Solution One of the pool devices (/dev/sdg) dropped offline before this boot, scrub the pool and post the results from the GUI.
September 12, 2025Sep 12 Author I double-checked the SATA cables and didn't get any errors when I rebooted.Ran another scrub, and didn't find any errors.Looks like I just need to re-create the docker .img is all I need to do?
September 12, 2025Sep 12 Community Expert Do that, also recommend monitoring the pool for any more issues: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/#findComment-700582
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