linux-kernel - Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid 5 under heavy load ?

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Message-Id: <B4617BF6-ABC5-4B38-801C-142ED3882444@neuf.fr>
Date:	Mon, 7 Jan 2008 21:22:57 +0100
From:	Guillaume Laurès <guillaume-laures@...f.fr>
To:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid 5 under heavy load  ?

Well, I should have tried to answer my own question earlier... but  
there is still a problem.

A quick reading of Wikipedia later, I can tell the following.
First, the anticipatory scheduler seems to be the worse choice when  
dealing with raid arrays.
Now, a better choice in my case could be:
- the CFQ scheduler for the array in the dom0;
- and the NOOP scheduler for the VBDs in the domUs (seems already  
there by default btw)

However even with CFQ/NOOP I keep getting soft resets, only the  
sata_nv SATA ports, when under load. Any thoughs ?

Thanks to all who did not flame me on this one ...;-)

GoM 
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