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Re: xfs: very slow after mount, very slow at umount

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: xfs: very slow after mount, very slow at umount
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 31 Jan 2011 14:17:20 -0500
Cc: david@xxxxxxx, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>, Alex Elder <aelder@xxxxxxx>, Mark Lord <kernel@xxxxxxxxxxxx>
In-reply-to: <20110129073554.GC21311@dastard>
References: <4D419765.4070805@xxxxxxxxxxxx> <4D41CA16.8070001@xxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1101271209370.17579@xxxxxxxxxxxxxx> <4D42056E.2050505@xxxxxxxxxxxxxxxxx> <alpine.DEB.2.00.1101271730030.17579@xxxxxxxxxxxxxx> <20110128135629.GX21311@dastard> <alpine.DEB.2.00.1101281119250.17579@xxxxxxxxxxxxxx> <20110129054021.GB21311@dastard> <alpine.DEB.2.00.1101282201260.29659@xxxxxxxxxxxxxx> <20110129073554.GC21311@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Jan 29, 2011 at 06:35:54PM +1100, Dave Chinner wrote:
> Just because we can't do it right now doesn't mean it is not
> possible. Array/raid controller vendors need to implement the SCSI
> block limit VPD page, and if they do then stripe unit/stripe width
> may be exposed for the device in sysfs. However, I haven't seen any
> devices except for md and dm that actually export values that
> reflect sunit/swidth in the files:

I have access to a few big vendor arrays that export it, but I think
they are still running beta firmware versions.

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