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Re: RAID5 internal log question

To: Mihai RUSU <dizzy@xxxxxxxxx>
Subject: Re: RAID5 internal log question
From: Austin Gonyou <austin@xxxxxxxxxxxxxxx>
Date: 15 Feb 2002 15:26:30 -0600
Cc: Linux XFS List <linux-xfs@xxxxxxxxxxx>
In-reply-to: <Pine.LNX.4.33.0202152301270.31300-100000@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <Pine.LNX.4.33.0202152301270.31300-100000@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
You could potentially exacerbate an IO issue, even with HW RAID, when
running in a degraded mode(failed drive) or during a rebuild.The outer
logging, if on a mirror, would be able to provide good through put and
ensure you don't have too many problems. 

On Fri, 2002-02-15 at 15:04, Mihai RUSU wrote:
> Hi
> 
> >From the XFS FAQ and other threads on this list I understand that is
> recommended to have the log of an XFS partition out of a RAID5. Is that
> performance impact that bad also with hardware RAID ?
> Because its rather strange to make that external log reside out of the
> RAID with hardware RAID (I have to reboot and use the BIOS configuration
> tool to setup another logical device which should not be RAID5 just only
> for the XFS log).
> 
> Thanks
> 
> ----------------------------
> Mihai RUSU
> "... and what if this is as good as it gets ?"
-- 
Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-698-7250
email: austin@xxxxxxxxxxxxxxx

"It is the part of a good shepherd to shear his flock, not to skin it."
Latin Proverb


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