Dear list,
I'm going to replace one hard drive (partition actually) of a btrfs
raid1. Can you please spell exactly what I need to do in order to get my
filesystem working as RAID1 again after replacement, exactly as it was
before? I saw some bad examples of drive replacement in this list so I
afraid to just follow random instructions on wiki, and putting this
system out of action even temporarily would be very inconvenient.
For this filesystem:
$ sudo btrfs fi show /dev/sdb7
Label: 'data' uuid: 37d3313a-e2ad-4b7f-98fc-a01d815952e0
Total devices 2 FS bytes used 106.23GiB
devid 1 size 2.71TiB used 126.01GiB path /dev/sda7
devid 2 size 2.71TiB used 126.01GiB path /dev/sdb7
$ grep /mnt/data /proc/mounts
/dev/sda7 /mnt/data btrfs
rw,noatime,space_cache,autodefrag,subvolid=5,subvol=/ 0 0
$ sudo btrfs fi df /mnt/data
Data, RAID1: total=123.00GiB, used=104.57GiB
System, RAID1: total=8.00MiB, used=48.00KiB
Metadata, RAID1: total=3.00GiB, used=1.67GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
$ uname -a
Linux host 4.4.0-93-generic #116-Ubuntu SMP Fri Aug 11 21:17:51 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
I've got this in dmesg:
[Sep 8 20:31] ata6.00: exception Emask 0x0 SAct 0x7ecaa5ef SErr 0x0
action 0x0
[ +0.000051] ata6.00: irq_stat 0x40000008
[ +0.000029] ata6.00: failed command: READ FPDMA QUEUED
[ +0.000038] ata6.00: cmd 60/70:18:50:6c:f3/00:00:79:00:00/40 tag 3
ncq 57344 in
res 41/40:00:68:6c:f3/00:00:79:00:00/40 Emask
0x409 (media error) <F>
[ +0.000094] ata6.00: status: { DRDY ERR }
[ +0.000026] ata6.00: error: { UNC }
[ +0.001195] ata6.00: configured for UDMA/133
[ +0.000030] sd 6:0:0:0: [sdb] tag#3 FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ +0.000005] sd 6:0:0:0: [sdb] tag#3 Sense Key : Medium Error
[current] [descriptor]
[ +0.000004] sd 6:0:0:0: [sdb] tag#3 Add. Sense: Unrecovered read
error - auto reallocate failed
[ +0.000005] sd 6:0:0:0: [sdb] tag#3 CDB: Read(16) 88 00 00 00 00 00
79 f3 6c 50 00 00 00 70 00 00
[ +0.000003] blk_update_request: I/O error, dev sdb, sector 2045996136
[ +0.000047] BTRFS error (device sda7): bdev /dev/sdb7 errs: wr 0, rd
1, flush 0, corrupt 0, gen 0
[ +0.000062] BTRFS error (device sda7): bdev /dev/sdb7 errs: wr 0, rd
2, flush 0, corrupt 0, gen 0
[ +0.000077] ata6: EH complete
There's still 1 in Current_Pending_Sector line of smartctl output as of
now, so it probably won't heal by itself.
--
With Best Regards,
Marat Khalili
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