Re: Locking md device and system for several seconds

[Neil Brown]

On Sunday November 13, info@xxxxxxxxxxxxx wrote:
> Hi!
> 
> I'm using kernel 2.6.14.2 with md (RAID1 static) as bootable.
> 
> While md synching (initial creation or after marked one as failed,
> removed and re-added) there are some locking problems with the
> complete system/kernel.

Can you check which IO scheduler the drives are using, try different
schedulers, and see if it makes a different.

     grep . /sys/block/*/queue/scheduler

will show you (the one in [brackets] is active). 
Then just echo a new value out to each file.

I've had one report that [anticipatory] causes this problem and [cfq]
removes it.  Could you confirm that?

Thanks,

NeilBrown

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