On Sat, 2 Jul 2011 12:07:54 +0100 "Cal Leeming [Simplicity Media Ltd]"
<cal.leeming@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Hi all,
>
> I tried to rebuild/sync two RAID1 arrays at the same time, with strange results.
>
> When a new drive was added into md0, it started to sync fine at
> 123,000kb/sec. Whilst that was running, I also added a new drive into
> md1, and this causes both arrays sync speed to slow down to
> 20,000kb/sec. I checked the /proc/sys/dev/raid/speed_limit_{min|max}
> and these were both set fine.
>
> I removed the drive from md1, and the md0 sync went back to the normal speed.
>
> RAID Setup:
> md0 - 2 drives (2TB Western Digital)
> md1 - 2 drives (500GB M3 SDD)
>
> So my question is, does anyone know why the sync speed (on all arrays)
> slowed down to almost 6-7 times the norm, when two (or more?) sync
> operations are taking place?
>
Dodgy controller? I assume both arrays are on the same controller.
Can you plug in a separate controller even if only temporarily and see what
happens?
I can see how any interaction with md would have this effect.
NeilBrown
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