On 06/27/2015 06:17 PM, Mordechay Kaganer wrote:
B.H.
Hello. I'm running our backup archive on btrfs. We have MD-based RAID5
array with 4 6TB disks then LVM on top of it, and btrfs volume on the
LV (we don't use btrfs's own RAID features because we want RAID5 and
as far as i understand the support is only partial).
I wanted to move the archive to another MD array of 4 8TB drives (this
time without LVM). So i did:
btrfs replace start 1 /dev/md1 <mount_point>
Where 1 is the only devid that was present and /dev/md1 is the new array.
The replace run successfully until finished after more than 5 days.
The system downloaded some fresh backups and created new snapshots
during the ongoing replace. I've go 2 kernel warnings about replace
task waiting for more than 120 seconds in the middle, but process
seamed to go on anyway.
After the replace have finished i did btrfs fi resize 1:max
<mount_point> then unmounted and mounted again using the new drive.
Then i've run a scrub on the FS - and got a lot of checksum errors.
Messages like this:
BTRFS: checksum error at logical 5398405586944 on dev /dev/md1, sector
10576283152, root 12788, inode 4512290, offset 23
592960, length 4096, links 1 (path: XXXXXXXXX)
BTRFS: bdev /dev/md1 errs: wr 0, rd 0, flush 0, corrupt 67165, gen 0
BTRFS: unable to fixup (regular) error at logical 5398405586944 on dev /dev/md1
Is there any way to fix this? I still have the old array available but
replace have wiped out it's superblock so it's not mountable.
# uname -a
Linux <hostname> 3.16.0-41-generic #57~14.04.1-Ubuntu SMP Thu Jun 18
18:01:13 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
# btrfs --version
Btrfs v3.12
I was seeing insane behavior with btrfs and kernel versions from the
stock/update distros. Upgrading the kernel to stable
(4.1.0-1.gfcf8349-default as of today) and btrfs progs btrfs-progs
v4.1+20150622
resolved the insane (such as negative left percentages during tasks etc)
behavior and errors I was seeing.
--
--Moby
They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety. -- Benjamin Franklin
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