Re: doubt about resync - raid1

[Marcus Sorensen <shadowsor@xxxxxxxxx>]

see /sys/block/md[0,1,2]/md/sync_force_parallel

On Thu, May 17, 2012 at 9:50 AM, Roberto Spadim <roberto@xxxxxxxxxxxxx> wrote:
> 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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