I'm trying to create RAID-1 with external bitmap with this command:
mdadm --create /dev/md11 --level=1 --bitmap=/mnt/src/bitmap --raid-devices 2 /dev/storage/origin missing
/dev/storage/origin is 1.2 TB; is placed on "stacked" block devices like this:
RAID-5 -> dm-crypt -> LVM-2 -> /dev/storage/origin
/mnt/src/bitmap is technically the same stacked device, except the last LVM volume:
RAID-5 -> dm-crypt -> LVM-2 -> /dev/storage/src -> /mnt/src/bitmap
(although I tried to keep bitmap outside of this RAID-5 device, and it was still hanging).
When started with "strace", mdadm hangs with 100% CPU usage after opening /mnt/src/bitmap:
(...)
rename("/var/run/map.new", "/var/run/map") = 0
flock(3, LOCK_UN) = 0
close(3) = 0
munmap(0x6ff40000, 4096) = 0
unlink("/var/run/map.lock") = 0
ioctl(4, 0x800c0910, 0x77f5f89c) = 0
fstat64(4, {st_mode=S_IFBLK|0600, st_rdev=makedev(9, 1), ...}) = 0
fstat64(4, {st_mode=S_IFBLK|0600, st_rdev=makedev(9, 1), ...}) = 0
ioctl(4, 0x800c0910, 0x77f5f7cc) = 0
ioctl(4, 0x40480923, 0x77f5f854) = 0
access("/mnt/src/bitmap", F_OK) = -1 ENOENT (No such file or directory)
open("/mnt/src/bitmap", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 3
I see no disk activity when this happens.
# mdadm -V
mdadm - v3.1.2 - 10th March 2010
Kernel is 2.6.34.1 (tried also 2.6.28.7), 32 bit x86 system.
Or, I didn't wait long enough? So far, it takes about an hour to create this array...
Creating smaller arrays (i.e. 8 GB) in a similar configuration works fine.
--
Tomasz Chmielewski
http://wpkg.org
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