| satoshi |
09-10-2011 11:00 AM |
RAID 1 - Unable to remove a disk from an array
Hi there,
I'm trying to remove a disk from an array but I get a device busy error.
Code:
# mdadm --fail /dev/md2 /dev/sdd2
mdadm: set /dev/sdd2 faulty in /dev/md2
# mdadm --remove /dev/md2 /dev/sdd2
mdadm: hot remove failed for /dev/sdd2: Device or resource busy
The strange thing is that if a remove the /dev/sdd2 partition using fdisk and then I restart the server, the /dev/md2 RAID partition disappears. But when I create the /dev/sdd2 partition again and I restart the server, the /dev/md2 partition appears again (and the /dev/sdd2 is still busy).
Any help is really appreciated.
Some useful information:
cat /etc/mdadm.conf
Code:
(... comments...)
ARRAY /dev/md1 level=raid1 num-devices=4 UUID=f05a1031:ad1bd9fe:a4d2adc2:26fd5302
cat /proc/mdstat
Code:
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md1 : active raid1 sdd1[3] sdc1[2] sdb1[1] sda1[0]
6142912 blocks [4/4] [UUUU]
md2 : active raid1 sdd2[3]
1048512 blocks [4/1] [___U]
unused devices: <none>
mdadm --detail --scan
Code:
ARRAY /dev/md/2_0 metadata=0.90 UUID=56e4c700:1889447e:34b941fd:060f7980
ARRAY /dev/md1 metadata=0.90 UUID=f05a1031:ad1bd9fe:a4d2adc2:26fd5302
mount
Code:
rootfs on / type rootfs (rw)
/dev/root on / type ext4 (rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered)
proc on /proc type proc (rw,relatime)
rc-svcdir on /lib64/rc/init.d type tmpfs (rw,nosuid,nodev,noexec,relatime,size=1024k,mode=755)
sysfs on /sys type sysfs (rw,relatime)
/dev on /dev type devtmpfs (rw,relatime,size=4046860k,nr_inodes=1011715,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
nfsd on /proc/fs/nfsd type nfsd (rw,nosuid,nodev,noexec,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
fdisk -l
Code:
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00081621
Device Boot Start End Blocks Id System
/dev/sdb1 4096 12290048 6142976+ fd Linux raid autodetect
/dev/sdb2 12290049 14387200 1048576 fd Linux raid autodetect
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00061093
Device Boot Start End Blocks Id System
/dev/sda1 * 4096 12290048 6142976+ fd Linux raid autodetect
/dev/sda2 12290049 14387200 1048576 fd Linux raid autodetect
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c5988
Device Boot Start End Blocks Id System
/dev/sdd1 4096 12290048 6142976+ fd Linux raid autodetect
/dev/sdd2 12290049 14387200 1048576 fd Linux raid autodetect
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a2f73
Device Boot Start End Blocks Id System
/dev/sdc1 4096 12290048 6142976+ fd Linux raid autodetect
/dev/sdc2 12290049 14387200 1048576 fd Linux raid autodetect
Disk /dev/md2: 1073 MB, 1073676288 bytes
2 heads, 4 sectors/track, 262128 cylinders, total 2097024 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md2 doesn't contain a valid partition table
Disk /dev/md1: 6290 MB, 6290341888 bytes
2 heads, 4 sectors/track, 1535728 cylinders, total 12285824 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
uname -r
Code:
gentoo-2.6.39-hardened-r8-xxxx-std-64
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