doubt about resync - raid1

[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

hi guys, i was running a resync in a non-normal hardware instalation

it's a server with 4 disks, they are in a raid hardware controller (perci
from dell)
disk 1-2 are raid1 and linux know it about /dev/sda
disk 3-4 are raid1 and linux know it about /dev/sdb

well i add more 4 disks
disk 5-6 raid1 with /dev/sdc
disk 7-8 raid1 with /dev/sdd

nice...
well /dev/sda and /dev/sdb have same partitions (/dev/sda1, 2 3 4) and have
some md devices in this partitions..
/dev/md0 = /dev/sda1 /dev/sdb1
/dev/md1 = /dev/sda2 /dev/sdb2
/dev/md2 = /dev/sda3 /dev/sdb3
all raid 1 too

i create same partitions on /dev/sdc, /dev/sdd
and add they to md raid1
/dev/md0 = /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
/dev/md1 = /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
/dev/md2 = /dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3


nice..
mdadm start resync...
the point is...
/dev/sda1 start copies to /dev/sdc1 and /dev/sdd1, i checked this with
iostat -d 1 -k, and server is idle, only mdadm and raid is running,
/dev/sda1 have reads and /dev/sdc1 and /dev/sdd1 have writes
nice..

the problem is...
/dev/sdc2 and /dev/sdd2 didn't start sync while /dev/md0 is running, since
they share the same devices (/dev/md0 => /dev/sda1, /dev/md1 => /dev/sda2)

could i force a sync in /dev/md1??
since /dev/sda is a raid1 hardware, it can handle two disks without
performace problems...
it have 2 heads, in others words the mdadm disk balance isn't perfect here
to this solution, but works... the problem is sync not running, if i could
force it every things could be allright

i must check kernel version, it's about 2.6.3x, 1 year old +-

well that's it, any ideas?


***
sorry if i send two emails, the email was configured to HTML/RICH TEXT text


--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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