2014-01-30 Chris Murphy <lists@xxxxxxxxxxxxxxxxx>:
>> Now the damaged disk disappeared completely. No sign of it in /proc/diskstats.
>
> I don't know what you mean by it's disappeared complete. Are you talking about the physical block device? Or the dm logical block device?
It failed and doesn't appear anywhere. I don't have physical access to
the server at the moment.
> What do you get for:
> lsblk
> blkid
> btrfs device scan --all-devices
> btrfs fi show
root@fortknox:/# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 232,9G 0 disk
└─sda1 8:1 0 232,9G 0 part /
sdb 8:16 0 1,8T 0 disk
└─sdb1 8:17 0 1,8T 0 part
└─bunkerA (dm-0) 253:0 0 1,8T 0 crypt
sdc 8:32 0 2,7T 0 disk
└─sdc1 8:33 0 2,7T 0 part /USBPLATTE
loop1 7:1 0 500G 0 loop
root@fortknox:/# blkid
/dev/sda1: UUID="d055ffe7-80ed-455e-8117-4a2c8bef3ed5" TYPE="ext4"
/dev/sdc1: UUID="812c784b-df5a-48a6-98ff-5b755e29b563" TYPE="ext4"
/dev/sdb1: UUID="947206e2-488e-4dc4-b243-912901512ed4" TYPE="crypto_LUKS"
/dev/mapper/bunkerA: LABEL="bunker"
UUID="7f954a85-7566-4251-832c-44f2d3de2211"
UUID_SUB="6c66c3c1-df8f-4b29-9acb-bd923a69b3ee" TYPE="btrfs"
root@fortknox:/# btrfs device scan --all-devices
Scanning for Btrfs filesystems
root@fortknox:/# btrfs fi show
Label: 'bunker' uuid: 7f954a85-7566-4251-832c-44f2d3de2211
Total devices 2 FS bytes used 1.58TiB
devid 2 size 1.82TiB used 1.59TiB path /dev/mapper/bunkerA
*** Some devices missing
Btrfs v3.12
>> But now, I can't mount bunkerA degraded,RW because degraded
>> filesystems are not allowed to be mounted RW (?)
>
> Have you tried? What errors do you get in user space and dmesg?
root@fortknox:/# umount /mnt
umount: /mnt: not mounted
root@fortknox:/# mount -odegraded,rw /dev/mapper/bunkerA /mnt
mount: wrong fs type, bad option, bad superblock on /dev/mapper/bunkerA,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
root@fortknox:/# dmesg|tail
[756751.574065] btrfs: bdev (null) errs: wr 1375454, rd 186442, flush
0, corrupt 0, gen 0
[756751.837133] Btrfs: too many missing devices, writeable mount is not allowed
[756751.865278] btrfs: open_ctree failed
[781332.902000] btrfs: device label bunker devid 2 transid 121487 /dev/dm-0
[781630.561889] btrfs: device label bunker devid 2 transid 121487
/dev/mapper/bunkerA
[781630.564673] btrfs: allowing degraded mounts
[781630.564684] btrfs: disk space caching is enabled
[781630.598155] btrfs: bdev (null) errs: wr 1375454, rd 186442, flush
0, corrupt 0, gen 0
[781630.816989] Btrfs: too many missing devices, writeable mount is not allowed
[781630.842901] btrfs: open_ctree failed
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