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Subject: Re: RAID-5 build time calculation?
From: Steve Lord <lord@sgi.com>
To: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
Cc: linux-kernel@vger.kernel.org
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Date: 14 Nov 2001 09:20:40 -0600
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On Wed, 2001-11-14 at 07:40, Roy Sigurd Karlsbakk wrote:
> hi all
> 
> I apologize if this is more of a support question, but I couldn't find it
> anywhere...
> 
> How long time may I have to wait for kernel to build a software RAID-5 on
> 12 18GB 15k SCSI drives? Algorithm is set to left-symmetric and persistent
> superblock is 1.
> 
> What can be done to speed this up_
> 
> thanks
> 

I have seen the raid resync get stuck at really slow rates, it seems to
start running faster if you echo a larger number into

/proc/sys/dev/raid/speed_limit_min

You can look at /proc/mdstat to see how the rebuild is progressing.

Steve