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@bruvv
Created December 6, 2019 18:12
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Synology BTRFS repair
btrfs fi show -d
(/dev/mapper/vg1000-lv)
syno_poweroff_task -d
(or: umount /volume1)
(or2: umount /volume1 -f -k)
Check to see if all us unmounted:
df -h
mdadm --stop /dev/vg1000/lv
btrfsck /dev/vg1000/lv
btrfs check --repair /dev/vg1000/lv
btrfs rescue super-recover -v /dev/vg1000/lv
vgchange -ay
e2fsck -nvf -C 0 /dev/vg1000/lv
fsck.ext4 -pvf -C 0 /dev/vg1000/lv
(or: e2fsck -pvf -C 0 /dev/vg1000/lv -C O)
(do not do this: -C fd)
@Invisi
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Invisi commented May 20, 2024

Greetings from 2024 with a DS1819+ running DSM 7.2.1-69057 Update 3.
Had some corrupted leaves and managed to get btrfs check /dev/mapper/cachedev_0 running by unmounting via synostgvolume --unmount -p /volume1 as mentioned in this xpenology thread and above. It did not shut down SSH for me.

Additionally, I couldn't run btrfs on /dev/vg1000/lv or /dev/md2, only /dev/mapper/cachedev_0 worked properly for unknown reasons. Good luck to you all.

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