Hello,
I have a strange issue, I cannot reduce the size of a degraded raid 5:
strace mdadm -vv --grow /dev/md125 --size=2778726400
Fails with:
Stace:
open("/sys/block/md125/md/dev-sdb4/size", O_WRONLY) = 4
write(4, "2778726400", 10) = -1 EBUSY (Device or resource busy)
close(4)
Stdout:
component size of /dev/md125 unchanged at 2858285568K
Stderr:
<nothing>
Any suggestions ?
Note: I can work around this bug, by moving partitions around a bit, and not requiring the size reduction.
However I suspect a bug/undocumented border case that should be resolved?
Things I tried:
---------------
- Disable bcache udev rules (as it was appearing in each attempt, maybe it got triggered during resize, seems not to be the case).
- I have tried the same with loop files -> this works fine even with bcache (and the udev rules disabled)
- Removed the internal write bitmap
- Opend the file os.open("md125",os.O_EXCL,os.O_RDWR) in Python to test if it's in use somewhere (command worked fine)
- Set array-size to the less then the desired new size (while still not destroying the FS below it).
Information:
------------
Kernel version: 3.15.5
mdadm tools: 3.3-r2
mdadm --detail:
/dev/md125:
Version : 1.2
Creation Time : Wed Apr 16 20:58:09 2014
Raid Level : raid5
Array Size : 8283750400 (7900.00 GiB 8482.56 GB)
Used Dev Size : 2858285568 (2725.87 GiB 2926.88 GB)
Raid Devices : 4
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Fri Jul 18 09:53:08 2014
State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
UUID : 885c588b:c3503d9d:c67b86db:2887f8f7
Events : 6440
Number Major Minor RaidDevice State
0 8 36 0 active sync /dev/sdc4
2 0 0 2 removed
2 8 20 2 active sync /dev/sdb4
4 8 52 3 active sync /dev/sdd4
--
Killian De Volder
Megasoft bvba
killian.de.volder@xxxxxxxxxxx
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