Machine is:
Debian Lenny, Linux version 2.6.26-2-686 (Debian 2.6.26-21lenny4)
mdadm - v2.6.7.2 - 14th November 2008
2 HD's
/dev/md1 = /, /dev/sda1 /dev/sdb1
/dev/md0 = /home/data, /dev/sda3 /dev/sdb3
They are numbered that way for "historical" reasons, I created /dev/md0
as data partition first and converted root/boot to RAID1 later.
The problem is:
/dev/md2 = swap, /dev/sda2, /dev/sdb2
I set up md2 (/dev/md2 is already in fstab as swap, the partition type
is fd on both drives):
mdadm --zero-superblock /dev/sda2
mdadm --zero-superblock /dev/sdb2
mdadm -C /dev/md2 -l 1 -n 2 /dev/sdb2 /dev/sda2
mkswap /dev/md2
swapon -a
free says: swap active, mdstat says:
md2 : active (auto-read-only) raid1 sda2[1] sdb2[0]
979840 blocks [2/2] [UU]
(no resync=PENDING or other funny stuff)
mdadm --examine --scan shows the md2, /etc/mdadm/mdadm.conf gets updated
by me.
reboot, and the free says: no swap.
cat /proc/mdstat says: no md2 !
mdadm --examine --scan shows md2, exactely as written in
/etc/mdadm/mdadm.conf
the longer output:
mdadm --examine /dev/sda2
/dev/sda2:
Magic : a92b4efc
Version : 00.90.00
UUID : d97bc68d:a6bd724d:b66f1fce:677f10ed (local to host
nearyou)
Creation Time : Mon Mar 29 03:43:06 2010
Raid Level : raid1
Used Dev Size : 979840 (957.04 MiB 1003.36 MB)
Array Size : 979840 (957.04 MiB 1003.36 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Update Time : Mon Mar 29 03:45:06 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : dec1b89a - correct
Events : 8
Number Major Minor RaidDevice State
this 1 8 2 1 active sync /dev/sda2
0 0 8 18 0 active sync /dev/sdb2
1 1 8 2 1 active sync /dev/sda2
mdadm --examine /dev/sda2
/dev/sda2:
Magic : a92b4efc
Version : 00.90.00
UUID : d97bc68d:a6bd724d:b66f1fce:677f10ed (local to host
nearyou)
Creation Time : Mon Mar 29 03:43:06 2010
Raid Level : raid1
Used Dev Size : 979840 (957.04 MiB 1003.36 MB)
Array Size : 979840 (957.04 MiB 1003.36 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Update Time : Mon Mar 29 03:45:06 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : dec1b89a - correct
Events : 8
Number Major Minor RaidDevice State
this 1 8 2 1 active sync /dev/sda2
0 0 8 18 0 active sync /dev/sdb2
1 1 8 2 1 active sync /dev/sda2
So the raid is there, it is on the HD, it is consistent and clean, it
says it's preferred minor is 2 = md2.
It is simply not autodetected at boot time, or not activated, I tried
that quite a few times now. I can recreate the raid with -C -f and issue
a --rebuild, swapon -a, everything fine. The other RAID1's on the drives
work as expected.
What is the trap I am running in here? I have other machines with
/dev/md1 as swap without such problems. It there some kind of kernel
option how high autodetect should count in md "Preferred Minor" devices?
kind regards,
Joachim Otahal
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
