I have a raid1 setup with three partitions:
md0, mounted on /, composed of /dev/sda1 and /dev/sdb1
md1, mounted on swap, composed of /dev/sda2 and /dev/sdb2
md2, mounted on swap, composed of /dev/sda3 and /dev/sdb3
I am not sure how it was installed because it was done a long time ago, I
don't even if I did it myself or someone else. I've found that the whole b
disk was in removed state, so we put a new disk (just in case) and added it.
Now when I reboot I get this state:
# mdadm --detail --scan
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda3,/dev/sdb3
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda1
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda2
As you can see md0 and m1 are missing the second member of the array. Further
inquiring shows it is removed:
# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.01
Creation Time : Tue Feb 7 14:58:18 2006
Raid Level : raid1
Array Size : 15623104 (14.90 GiB 16.00 GB)
Device Size : 15623104 (14.90 GiB 16.00 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Feb 21 01:04:16 2007
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
UUID : a1a07d14:64ab7244:8a585e9b:fbee0505
Events : 0.6120832
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 - removed
# mdadm --detail /dev/md1
/dev/md1:
Version : 00.90.01
Creation Time : Tue Feb 7 14:59:06 2006
Raid Level : raid1
Array Size : 979840 (956.88 MiB 1003.36 MB)
Device Size : 979840 (956.88 MiB 1003.36 MB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Wed Feb 21 00:43:44 2007
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
UUID : 2e8d1e91:1db84b53:602c6a7d:b9fb162a
Events : 0.1409
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 0 0 - removed
I believe md2 was ok because it was actually assembled
from /etc/mdadm/mdadm.conf which lists both partitions correctly:
# cat /etc/mdadm/mdadm.conf
DEVICE partitions
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda1,/dev/sdb1
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda2,/dev/sdb2
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda3,/dev/sdb3
but md0 and md1 must have been assembled with another method (because there
was no /etc at that time to read configs from) and that must be failing
somehow.
The kernel command line is: root=/dev/md0 ro md=0,/dev/sda1,/dev/sdb1
The relevant information from dmesg is:
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: raid1 personality registered as nr 3
...
md: raid0 personality registered as nr 2
raid5: automatically using best checksumming function: pIII_sse
pIII_sse : 5044.000 MB/sec
raid5: using function: pIII_sse (5044.000 MB/sec)
md: raid5 personality registered as nr 4
...
md: md1 stopped.
md: bind<sda2>
raid1: raid set md1 active with 1 out of 2 mirrors
md: md0 stopped.
md: bind<sda1>
raid1: raid set md0 active with 1 out of 2 mirrors
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
Adding 979832k swap on /dev/md1. Priority:-1 extents:1
EXT3 FS on md0, internal journal
Capability LSM initialized
md: md2 stopped.
md: bind<sdb3>
md: bind<sda3>
raid1: raid set md2 active with 2 out of 2 mirrors
kjournald starting. Commit interval 5 seconds
EXT3 FS on md2, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
Any ideas what is wrong here?
If after that I add the spare partitions, everything is good, until the next
reboot:
# mdadm /dev/md0 --add /dev/sdb1
mdadm: hot added /dev/sdb1
# mdadm /dev/md1 --add /dev/sdb2
mdadm: hot added /dev/sdb2
# mdadm --detail --scan
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda3,/dev/sdb3
ARRAY /dev/md0 level=raid1 num-devices=2 spares=1 UUID=[...]
devices=/dev/sda1,/dev/sdb1
ARRAY /dev/md1 level=raid1 num-devices=2 spares=1 UUID=[...]
devices=/dev/sda2,/dev/sdb2
and after waiting some minutes:
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda3,/dev/sdb3
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda1,/dev/sdb1
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=[...]
devices=/dev/sda2,/dev/sdb2
Any help is greatly appreciated.
Thank you.
--
José Pablo Fernández
[EMAIL PROTECTED]
