SYNOPSIS
mount -o degraded,ro /dev/disk/by-uuid/ec3 /mnt/ec3/ && echo noerror
noerror
DESCRIPTION
mount -t btrfs fails but returns with noerror as above and only since the last reboot.
btrfs check seems clean to me (I am simple user).
btrfs restore errors out with "We have looped trying to restore files in"...
I had a lingering artifact btrfs filesystem show giving " *** Some devices missing " on the volume. This meant it would not automount on boot and I have been manually mounting (+ searching for a resolution to that)
I have previously used rdfind to deduplicate with hard links (as many as 10 per file)
I had just backed up using btrfs send/recieve but have to check if I have everything - this was the main Raid1 server
DETAILS
btrfs-find-root /dev/disk/by-uuid/ec3
Superblock thinks the generation is 103093
Superblock thinks the level is 1
Found tree root at 8049335181312 gen 103093 level 1
btrfs restore -Ds /dev/disk/by-uuid/ec3 restore_ec3
We have looped trying to restore files in
df -h /mnt/ec3/
Filesystem Size Used Avail Use% Mounted on
/dev/dm-0 16G 16G 483M 97% /
mount -o degraded,ro /dev/disk/by-uuid/ec3 /mnt/ec3/ && echo noerror
noerror
df /mnt/ec3/
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/dm-0 16775168 15858996 493956 97% /
btrfs filesystem show /dev/disk/by-uuid/ec3
Label: none uuid: ec3
Total devices 3 FS bytes used 1.94TiB
devid 6 size 2.46TiB used 1.98TiB path /dev/mapper/26d2e367-65ea-47ad-b298-d5c495a33efe
devid 7 size 2.46TiB used 1.98TiB path /dev/mapper/3c193018-5956-4637-9ec2-dd5e49a4a412
*** Some devices missing #### comment, this is an old artifact unchanged since before unable to mount
btrfs check /dev/disk/by-uuid/ec3
Checking filesystem on /dev/disk/by-uuid/ec3
UUID: ec3
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 2132966506496 bytes used err is 0
total csum bytes: 2077127248
total tree bytes: 5988204544
total fs tree bytes: 3492638720
total extent tree bytes: 242151424
btree space waste bytes: 984865976
file data blocks allocated: 3685012271104
referenced 3658835013632
btrfs-progs v4.1.2
Update: After a reboot (had to wait for a slot to go down) the system mounts manually but not completely clean.
Now asking question on irc #btrfs:
! http://pastebin.com/359EtZQX
Hi, I'm scratching my head and searched in vain to remove *** Some devices missing. Can anyone help give me a clue to clean this up?
- is there a good way to 'fix' the artifacts I am seeing? trying: scrub, balance. Try: resize, defragment.
- would I be advised to move to a new clean volume set?
- would a fix via a btrfs send/recieve be safe from propogating errors?
- or (more painfully) rsync to a clean volume? http://pastebin.com/359EtZQX (My first ever day using irc)
