I did some more tests, and it looks like my problem may be related to
SMP. When I setup a RAID1 array on my SMP machine, the component
devices stay "dirty", but when I do the same on an UP machine, the
state is "clean". However, when I boot the SMP machine with "nosmp",
or boot a non-SMP kernel, the problem persists. Both machines run a
2.6.0-test5 kernel (with your oops fix from 2003-09-12), and have
mdadm-1.3.0.
This is the test script:
#!/bin/sh
dd bs=1024k count=10 if=/dev/zero of=/tmp/img1
dd bs=1024k count=10 if=/dev/zero of=/tmp/img2
losetup /dev/loop1 /tmp/img1
losetup /dev/loop2 /tmp/img2
mdadm -C -n 2 -l 1 /dev/md1 /dev/loop1 /dev/loop2
while grep resync /proc/mdstat
do sleep 1
done
echo done
sleep 3
mdadm -E /dev/loop1
mdadm -S /dev/md1
losetup -d /dev/loop1
losetup -d /dev/loop2
rm /tmp/img1
rm /tmp/img2
This is the output on the UP machine:
[======>..............] resync = 30.0% (3584/10176) finish=0.1min speed=716K/sec
done
/dev/loop1:
Magic : a92b4efc
Version : 00.90.00
UUID : 6553bca6:9c4152b1:960d65fc:75de3d79
Creation Time : Sat Sep 27 16:23:58 2003
Raid Level : raid1
Device Size : 10176 (9.94 MiB 10.42 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Update Time : Sat Sep 27 16:24:11 2003
State : clean, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 35976528 - correct
Events : 0.1
Number Major Minor RaidDevice State
this 0 7 1 0 active sync /dev/loop1
0 0 7 1 0 active sync /dev/loop1
1 1 7 2 1 active sync /dev/loop2
This is the output on the SMP machine:
[>....................] resync = 0.0% (0/10176) finish=1.6min speed=0K/sec
done
/dev/loop1:
Magic : a92b4efc
Version : 00.90.00
UUID : dc1e7844:0571f448:75ec8ac0:df235bed
Creation Time : Sat Sep 27 16:23:18 2003
Raid Level : raid1
Device Size : 10176 (9.94 MiB 10.42 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Update Time : Sat Sep 27 16:23:19 2003
State : dirty, no-errors
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 5eb70538 - correct
Events : 0.1
Number Major Minor RaidDevice State
this 0 7 1 0 active sync /dev/loop1
0 0 7 1 0 active sync /dev/loop1
1 1 7 2 1 active sync /dev/loop2
--
Dick Streefland //// De Bilt
dick.streefland@xs4all.nl (@ @) The Netherlands
------------------------------oOO--(_)--OOo------------------
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