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Re: nfs/local performance with software raid5 and xfs and SMP

To: Steve Lord <lord@xxxxxxx>
Subject: Re: nfs/local performance with software raid5 and xfs and SMP
From: Tru Huynh <tru@xxxxxxxxxx>
Date: Thu, 19 Jul 2001 19:12:05 +0200
Cc: "linux-xfs@xxxxxxxxxxx" <linux-xfs@xxxxxxxxxxx>
Organization: Institut Pasteur
References: <200107191617.f6JGHwk32337@jen.americas.sgi.com>
Sender: owner-linux-xfs@xxxxxxxxxxx
A little update,

At least, some better news:
I did *NOT* see the problem (yet!) with the noapic option
with 2.4.7pre8-SMP

Steve Lord wrote:
> 
<...>

> If you choose another partition (non raid5) for the log and make an external
> log instead of using an internal log then the issue should go away, we
> are going to test this here. I suppose a mirrored log would be the best
> solution here as you could still survive the loss of a drive with the
> log on it.

I wish I could do that :) 
- hda and hdc on a raid 1 array (system disk) + mirrored xfs log 
- sda..sdh for a 7 disk + 1 hot spare disk for the raid5 array.

The only issue is space, trying to squeeze a second IDE disk
on the second IDE controller will not easily be manageable is
the rack :(
I do have a spare system disk on the shelf, and quick method to
restore the system disk but I would not risk putting the xfs log
on this lone disk.

What if I cut the 8 disks in 2 parts
1st partition of sd[a..d] of 2 GB (enough?) for a raid10 array for the
log
2nd partition of sd[a..g] for the main raid5 array 
sdh for the hot spare?

Best regards,

Tru
--
Dr Tru Huynh          | Bioinformatique Structurale
mailto:tru@xxxxxxxxxx | tel/fax +33 1 45 68 87 37/19
Institut Pasteur, 25-28 rue du Docteur Roux, 75724 Paris CEDEX 15 France


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