Time-honoured problem : RHEL3 iowait performance

[Steve Thompson]

On Sat, 3 Mar 2007, Brendan Heading wrote:

> Robin Humble wrote:
>> Hi Brendan,
>>
>> On Fri, Mar 02, 2007 at 12:52:14PM +0000, Brendan Heading wrote:
>>> Robin Humble writes:
>>
>> BTW, I forgot to mention that I'm using CentOS4.4 x86_64 which could
>> have very different to characteristics to RHEL3.
>
> It does indeed. Upgrading to RHEL4 is something that may be on the
> cards, but I'd have to be sure that it would help things.

I just got to try this out myself, having also noticed a big difference 
between LVM and non-LVM on RHEL3. On RHEL4 (actually, CentOS 4.4) on a 
Dell PE2900 server (Intel 5160 CPUs at 3.0GHz) with SAS disks, the LVM and 
non-LVM I/O are very close together (within 1% of each other).

Steve
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