Re: md raid10 regression in 2.6.27.4 (possibly earlier)

On Mon, 3 Nov 2008, Thomas Backlund wrote:

Thomas Backlund skrev:

quoted

Thomas Backlund skrev:

quoted

Peter Rabbitson skrev:

Ands some more info...
After rebooting into 2.6.27.4 I got this again:

md5 : active raid1 sdb7[1] sda7[0] sdd7[2]
     530048 blocks [4/3] [UUU_]

md3 : active raid10 sdc5[4](S) sda5[3] sdd5[0] sdb5[1]
     20980608 blocks 64K chunks 2 near-copies [4/3] [UU_U]

md2 : active raid10 sdc3[4](S) sda3[5](S) sdd3[3] sdb3[1]
     41961600 blocks 64K chunks 2 near-copies [4/2] [_U_U]

So it seems it's not only raid10 affected....

and here how they are started:
[root@tmb ~]# cat /etc/udev/rules.d/70-mdadm.rules
SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="linux_raid*", \
	RUN+="/sbin/mdadm --incremental --run --scan $root/%k"

Maybe only raid10 + other raids?  Running r1+r5 here, no problems with 2.6.27.4:

$ cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md1 : active raid1 sdb2[1] sda2[0]
      136448 blocks [2/2] [UU]

md2 : active raid1 sdb3[1] sda3[0]
      276109056 blocks [2/2] [UU]

md3 : active raid5 sdl1[9] sdk1[6] sdj1[7] sdi1[5] sdh1[8] sdg1[4] sdf1[3] sde1[0] sdd1[1] sdc1[2]
      2637296640 blocks level 5, 1024k chunk, algorithm 2 [10/10] [UUUUUUUUUU]

md0 : active raid1 sdb1[1] sda1[0]
      16787776 blocks [2/2] [UU]

unused devices: <none>