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Re: 30 TB RAID6 + XFS slow write performance

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: 30 TB RAID6 + XFS slow write performance
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Fri, 22 Jul 2011 13:05:14 -0500
Cc: xfs@xxxxxxxxxxx, Dave Chinner <david@xxxxxxxxxxxxx>, John Bokma <contact@xxxxxxxxxxxxx>
In-reply-to: <201107220810.01889@xxxxxx>
References: <4E24907F.6020903@xxxxxxxxxxxxx> <201107210820.01019@xxxxxx> <20110721064838.GA13963@dastard> <201107220810.01889@xxxxxx>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20110616 Thunderbird/3.1.11
On 7/22/2011 1:10 AM, Michael Monnerie wrote:

> Yes, I just wanted to know about the corner cases, and how XFS behaves. 
> Actually, we're changing over to using NetApps, and with their WAFL 
> anyway I should drop all su/sw usage and just use 4KB blocks.

I've never used a NetApp filer myself.  However, that said, I would
assume that WAFL is only in play for NFS/CIFS transactions since WAFL is
itself a filesystem.

When exposing LUNs from the same filer to FC and iSCSI hosts I would
assume the filer acts just as any other SAN controller would.  In this
case I would think you'd probably still want to align your XFS
filesystem to the underlying RAID stripe from which the LUN was carved.


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