Hi, All:
Today, I encountered this problem and don't know whether it is a bug.
# uname -a
Linux Storage 2.6.31.6 #7 Thu Dec 10 15:24:00 CST 2009 ppc unknown
# mdadm -C /dev/md0 --bitmap=internal -l5 -n3 /dev/sd{b1,c1,d1}
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Thu Dec 10 15:45:48 2009
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Thu Dec 10 15:45:48 2009
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=3 ctime=Thu Dec 10 15:45:48 2009
Continue creating array? y
mdadm: array /dev/md0 started.
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]
5879552 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
[===>.................] recovery = 15.7% (462848/2939776)
finish=2.0min speed=20125K/sec
bitmap: 0/180 pages [0KB], 8KB chunk
unused devices: <none>
#dd if=/dev/zero of=/dev/md0 bs=1M count=1000
When dd is going on, I cat /proc/mdstat
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]
5879552 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
[========>............] recovery = 44.1% (1297280/2939776)
finish=3.3min speed=8166K/sec
bitmap: 6/180 pages [24KB], 8KB chunk
After dd completed, I cat /proc/mdstat:
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[2] sdc1[1] sdb1[0]
5879552 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 32/180 pages [128KB], 8KB chunk
unused devices: <none>
Some time later, I cat /proc/mdstat again:
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[2] sdc1[1] sdb1[0]
5879552 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 32/180 pages [128KB], 8KB chunk
unused devices: <none>
As you noticed, the value before slash in "bitmap: 32/180 pages "
never changed. I think it should be zero after date is written into
disk.
unused devices: <none>
--
The simplest is not all best but the best is surely the simplest!
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