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From Nico Kadel-Garcia <>
Subject Re: Standards "Best Practice"
Date Fri, 01 Jul 2011 12:47:03 GMT
On Fri, Jul 1, 2011 at 8:27 AM, Andy Levy <> wrote:
> On Fri, Jul 1, 2011 at 07:55, Nico Kadel-Garcia <> wrote:
>> This is more likely to happen in virtualization due to limiting the
>> disk resources. Think hard about your back end disk storage. Let us
>> know if you use attached storage such as a NetApp or fibre channel,
>> I've got some notes on aligning those filesystems for virtualization,
>> which makes a huge performance improvement.
> I'd like to see those notes if I can. We're on a NetApp device right
> now but when we upgrade our environment later this year we'll be
> moving storage to an Equallogic device. We have had some Subversion
> performance issues with large checkouts using the NetApp device. The
> Equallogic appears to be better-tuned in general (we've had no trouble
> running a 100GB SQL Server DB off it) but every little bit helps.

The big booby trap was the 4096 byte block alignment, as described at
This is awkward to configure fat installation time for virtualized
OS's, and it makes a huge performance difference. If you look up "4096
byte block NetApp Nico Kadel-Garcia" on Google, you'll see my comments
on this for the last year or so.

My old work accounts at Red Hat and NetApp are no longer active (I
ended that contract and started a new job.), so I don't have access to
the scripts I submitted on their support sites. Do you have Access to
Red Hat's knowledgebase? Some notes are at,
and I can dig around for a published copy of the tools.

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