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Date: Fri, 30 Mar 2007 04:12:37 -0400 (EDT)
From: Justin Piszcz <jpiszcz@lucidpixels.com>
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To: Neil Brown <neilb@suse.de>
cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org
Subject: Re: Software RAID (non-preempt) server blocking question. (2.6.20.4)
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On Fri, 30 Mar 2007, Neil Brown wrote:

> On Thursday March 29, jpiszcz@lucidpixels.com wrote:
>>
>>>
>>> Did you look at "cat /proc/mdstat" ?? What sort of speed was the check
>>> running at?
>> Around 44MB/s.
>>
>> I do use the following optimization, perhaps a bad idea if I want other
>> processes to 'stay alive'?
>>
>> echo "Setting minimum resync speed to 200MB/s..."
>> echo "This improves the resync speed from 2.1MB/s to 44MB/s"
>> echo 200000 > /sys/block/md0/md/sync_speed_min
>> echo 200000 > /sys/block/md1/md/sync_speed_min
>> echo 200000 > /sys/block/md2/md/sync_speed_min
>> echo 200000 > /sys/block/md3/md/sync_speed_min
>> echo 200000 > /sys/block/md4/md/sync_speed_min
>>
>
> Yes, well....
>
> You told it to use up to 200MB/s and the drives are only delivering
> 44MB/s, so they will be taking nearly all of the available bandwidth.
> You shouldn't be too surprised if other things suffer.
>
> NeilBrown
>

Understood, will reduce this, thanks.

Justin.