I started working with raid this week with 2.2.20 + raid patches. I'm
using the raid tools that came with RH6x, because the current raidtools
don't compile:
gcc -O2 -Wall -DMD_VERSION=\""raidtools-0.90"\" -c -o detect_multipath.o detect_multipath.c
scsi.c:38: scsi/scsi_ioctl.h: No such file or directory
make: *** [scsi.o] Error 1
detect_multipath.c:49: scsi/scsi_ioctl.h: No such file or directory
make: *** [detect_multipath.o] Error 1
This isn't my main question, but help with this would be appreciated too.
The raid drives are hda+hdg. I have hda marked failed in raidtab and
only use it (temporarily) to boot. Somehow I've managed to get my
system in a state where it thinks hda is in the raid, yet it doesn't
show in mdstat and can't be removed with raidhotremove.
The raid stuff looks very useful, but I have gotten into many weird
states, with complaints about short reads, file system size doesn't
match superblock size/partition size, and this problem of "not in but in".
Does anyone know how can I get /dev/hdx to be outta this array?
Thanks
Jim
(I'm on the mailing list)
# cat /proc/mdstat (hdax doesn't show up 'cause marked failed)
Personalities : [raid1]
read_ahead 1024 sectors
md1 : active raid1 hdg2[1] 1048704 blocks [2/1] [_U]
md2 : active raid1 hdg3[1] 262464 blocks [2/1] [_U]
md3 : active raid1 hdg4[1] 58727488 blocks [2/1] [_U]
unused devices: <none>
[root@ ~]# raidhotremove /dev/md1 /dev/hda2
/dev/md1: can not hot-remove disk: disk not in array!
[root@ ~]# mount /dev/hda2 /mnt
mount: /dev/hda2 already mounted or /mnt busy
# cat /etc/fstab
/dev/hda1 /boot ext2 defaults 1 2
/dev/md1 / ext2 defaults 1 1
/dev/md2 swap swap defaults,pri=0 0 0
/dev/md3 /home ext2 defaults 1 2
[root@ ~]# cat /etc/raidtab
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda1
failed-disk 0
device /dev/hdg1
raid-disk 1
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda2
failed-disk 0
device /dev/hdg2
raid-disk 1
raiddev /dev/md2
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda3
failed-disk 0
device /dev/hdg3
raid-disk 1
raiddev /dev/md3
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda4
failed-disk 0
device /dev/hdg4
raid-disk 1
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