> What does this means ?
It would thrash the disk heads to keep moving from one partition to another
between each disk operation, so when re-synching disks, it ensures that only
one thread is using a particular disk (spindle) at a time.
> Where is the overlapping ?
Not really overlapping, rather ``using the same set of heads''.
> Dec 9 10:14:11 localhost kernel: md: serializing resync, md1 has
> overlapping physical units with md2!
> Dec 9 10:14:11 localhost kernel: md: serializing resync, md0 has
> overlapping physical units with md2!
Notification only -- not error -- md0 and md1 also use spindles used by md2,
which is already re-synch'ing
> md0 : active raid1 hdb2[1] hda2[0] 1542144 blocks [2/2] [UU] resync=DELAYED
> md1 : active raid1 hdb5[1] hda5[0] 136448 blocks [2/2] [UU] resync=DELAYED
> md2 : active raid1 hdb6[1] hda6[0] 2530112 blocks [2/2] [UU] resync=44%
> finish=14.8min
Just as expected -- hda and hdb are in use, re-synch'ing md2, so md0 and md1
are patiently waiting ...
