somethings aren't matching well. the issue is..
----
[ 6219.703606] Btrfs: too many missing devices, writeable mount is not
allowed
----
But per Vincent only xvdc is missing in a raid10 (both data and metadata
are raid10 ?)
Anand
On 10/18/14 10:02, Suman Chakravartula wrote:
On 2014-10-17 18:47, Vincent. wrote:
Hi !
I have a faulty drive in my raid10 and want it to be replaced.
Working drive are xvd[bef] and replacement drive is xvdc.
This is something I ran into the other day. Key difference is that I was
running 3.17.1 kernel and 3.16 btrfs-progs
When I mount my drive in RW:
#mount -odegraded /dev/xvdb /tank
#dmesg -c
[ 6207.294513] btrfs: device fsid 728ef4d8-928c-435c-b707-f71c459e1520
devid 1 transid 551398 /dev/xvdb
[ 6207.327357] btrfs: allowing degraded mounts
[ 6207.477041] btrfs: bdev (null) errs: wr 15211054, rd 3038899, flush
0, corrupt 0, gen 0
[ 6219.703606] Btrfs: too many missing devices, writeable mount is not
allowed
[ 6219.785929] btrfs: open_ctree failed
In my case, I was able to rw mount. May be update btrfs-progs and retry?
When I mount my drive in RO:
#mount -odegraded,ro /dev/xvdb /tank
#btrfs filesystem show
Label: none uuid: 728ef4d8-928c-435c-b707-f71c459e1520
Total devices 4 FS bytes used 4.70TiB
devid 1 size 2.73TiB used 2.73TiB path /dev/xvdb
devid 2 size 2.73TiB used 2.73TiB path
devid 3 size 2.73TiB used 2.73TiB path /dev/xvde
devid 4 size 2.73TiB used 2.73TiB path /dev/xvdf
Btrfs v3.12
Of course, because my mount is in RO, i can't add device and do a
balance:
#btrfs device add /dev/xvdc /tank
ERROR: error adding the device '/dev/xvdc' - Read-only file system
Neither a "replace without disk":
#btrfs replace start -Br 2 /dev/xvdc /tank
ERROR: ioctl(DEV_REPLACE_START) failed on "/tank": Read-only file
system, no error
Because my mount was rw, replace worked.
FYI I'm on ubuntu 14.04 with btrfs 3.12
Any idea ?
Thanks !
--
fensoft
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