I'm still trying to figure out why some of the mdadm regression tests fail. I started looking at tests/00raid1:
# ./test --tests=00raid1
It is nice that ./test is a bash script so it is easy to do some debugging.
The test script looks like:
# create a simple mirror
# test version0, version1, and no super
# test resync and recovery.
mdadm -CR $md0 -l 1 -n2 $dev0 $dev1
check resync
check raid1
testdev $md0 1 $mdsize1a 64
mdadm -S $md0
# now with version-0.90 superblock, spare
mdadm -CR $md0 -e0.90 --level=raid1 -n3 -x2 $dev0 missing missing $dev1 $dev2
check recovery
check raid1
testdev $md0 1 $mdsize0 64
mdadm -S $md0
# now with no superblock
mdadm -B $md0 -l mirror -n2 $dev0 $dev1
check resync
check raid1
testdev $md0 1 $size 1
#### Point 1
mdadm -S $md0
# again, but with no resync
mdadm -B $md0 -l 1 --assume-clean -n2 $dev0 $dev1
check raid1
check nosync
testdev $md0 1 $size 1
mdadm -S $md0
exit 0
What I did was add a couple of 'cat /proc/mdstat' commands where the script was failing. At Point 1 above, I got:
++ cat /proc/mdstat
Personalities : [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md127 : inactive md0[0](S)
19904 blocks
md0 : active raid1 loop1[1] loop0[0]
20000 blocks super non-persistent [2/2] [UU]
[==>..................] resync = 12.5% (2688/20000) finish=0.1min speed=2688K/sec
The line with resync looked suspicious so at that point I added a 'sleep 10' command. The test now passes.
The full log is at http://anduin.linuxfromscratch.org/~bdubbs/files/mdadm-test1.log
Does anyone know what is going on to need this sleep in order for this test to pass?
-- Bruce Dubbs