I've been running Docker containers on unRAID for quite a while now and I recently started having issues.  My NZBget container often complains about being out of space during while unraring.  All of my docker containers and their data are on my cache driver (750GB).  I do not use the cache for my user shares or anything else and I haven;t changed anything recently other than update some containers.  This morning I looked and NZBget showed a space issue for a download.  I checked the unraid main screen and it is showing 418GB free on my cache drive.  ANy odeas on what might be happening?

 

My unRAID log is attached.

wopr-syslog-20170729-1149.zip

Your docker.img file appears to be full (btw, diagnostics are preferred over syslogs)

 

Jul 28 23:27:49 WOPR kernel: blk_update_request: I/O error, dev loop0, sector 5192054
Jul 28 23:27:49 WOPR kernel: BTRFS error (device loop0): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
Jul 28 23:27:49 WOPR shfs/user: err: shfs_write: write: (28) No space left on device

But, it appears to be related to this:

Jul 26 19:05:57 WOPR kernel: BTRFS warning (device sdb1): block group 104173928448 has wrong amount of free space
Jul 26 19:05:57 WOPR kernel: BTRFS warning (device sdb1): failed to load free space cache for block group 104173928448, rebuilding it now

 

First issue is easy, second one needs help from someone more familiar with BTRFS cache drives ( @johnnie.black )

 

 

Those last btrfs warnings are usually not serious, but there are read errors on the cache device, those are hardware errors, from a bad disk or a bad cable/port, etc, hard to say more without the full diagnostics.

 

Quote

Jul 26 19:00:21 WOPR kernel: BTRFS info (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 28, flush 0, corrupt 0, gen 0

 

Under the Docker settings page it says I am using 9.77GiB out fo 20.00GiB:

 

Label: none  uuid: 4c1a64ff-2605-41f8-87ce-136fcc9896f9
	Total devices 1 FS bytes used 3.90GiB
	devid    1 size 20.00GiB used 9.77GiB path /dev/loop0

 

I've attached my diagnostics.

wopr-diagnostics-20170729-1259.zip

SMART for the cache disk looks fine, check/replace cables, run an extended SMART test, delete and recreate docker image, upgrade to latest unRAID and post new diagnostics if there are more issues, as latest release includes better btrfs diags.