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

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From: Guillaume Laurès <guillaume-laures@...>
To: <linux-kernel@...>
Subject: Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid 5 under heavy load ?
Date: Monday, January 7, 2008 - 4:22 pm

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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Messages in current thread:
PROBLEM: I/O scheduler problem with an 8 SATA disks raid 5 u..., Guillaume Laurès, (Mon Jan 7, 10:58 am)
Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid..., Guillaume Laurès, (Mon Jan 7, 4:22 pm)
Re: PROBLEM: I/O scheduler problem with an 8 SATA disks raid..., Chuck Ebbert, (Tue Jan 8, 6:56 pm)