i recently set up a drive pool in single mode on my little media
server. about a week later SMART started telling me that the drive
was having issue and there is one bad sector. since the array is far
from full i decided to remove the drive from the pool. but running
btrfs device remove /dev/sdc /mnt/pool
resulted in a deadlock. everything crashed, and i had to pull the
plug to reboot. once up i did a btrfs check of the drive and it
reported no issues with the file system... but running the remove
again results in a dead lock. i have tried running a scrub and it
eventually results in a dead lock also.
my system:
Linux kodbox 4.13.0-38-generic #43-Ubuntu SMP Wed Mar 14 15:20:44 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
btrfs version:
btrfs-progs v4.12
though i have also compiled the latest btrfs from git and i get the
same results.
btrfs fi sh /mnt/pool
Label: none uuid: cb30a848-1882-4f7f-aae1-1533f52d8783
Total devices 4 FS bytes used 6.73TiB
devid 1 size 7.28TiB used 5.67TiB path /dev/sdb1
devid 2 size 1.82TiB used 219.00GiB path /dev/sdd1
devid 3 size 1.82TiB used 220.03GiB path /dev/sda1
devid 4 size 3.64TiB used 655.00GiB path /dev/sdc1
btrfs fi us /mnt/pool
Overall:
Device size: 14.55TiB
Device allocated: 6.74TiB
Device unallocated: 7.81TiB
Device missing: 0.00B
Used: 6.74TiB
Free (estimated): 7.81TiB (min: 3.91TiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:6.73TiB, Used:6.72TiB
/dev/sda1 216.00GiB
/dev/sdb1 5.67TiB
/dev/sdc1 655.00GiB
/dev/sdd1 215.00GiB
Metadata,RAID1: Size:8.00GiB, Used:7.25GiB
/dev/sda1 4.00GiB
/dev/sdb1 8.00GiB
/dev/sdd1 4.00GiB
System,RAID1: Size:32.00MiB, Used:768.00KiB
/dev/sda1 32.00MiB
/dev/sdb1 32.00MiB
Unallocated:
/dev/sda1 1.60TiB
/dev/sdb1 1.60TiB
/dev/sdc1 3.00TiB
/dev/sdd1 1.60TiB
smartmontools tells me this:
=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed: read failure 90% 11625
1372896792
# 2 Short offline Completed: read failure 90% 11571
1372896792
# 3 Extended offline Completed: read failure 90% 11562
1372896792
# 4 Extended offline Completed without error 00% 11243 -
# 5 Short offline Completed without error 00% 10702 -
# 6 Conveyance offline Completed without error 00% 10702 -
can i just dd if=zero of=/dev/sdc count=1 bs=16k seek=42903024
(i get the location by calculating lba * sector size / block size, so
1372896792*512/16384
which should cause the drive to correctly reallocate the sector. i think.
anyway, the data is not super important, but i'd like to rescue it if
i can. is there a way to get data off of one device manually and put
it on another device?
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