linux-kernel - Re: xfs: very slow after mount, very slow at umount

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Message-ID: <20110131191720.GA2327@infradead.org>
Date:	Mon, 31 Jan 2011 14:17:20 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	david@...g.hm, Stan Hoeppner <stan@...dwarefreak.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, xfs@....sgi.com,
	Christoph Hellwig <hch@...radead.org>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	Alex Elder <aelder@....com>, Mark Lord <kernel@...savvy.com>
Subject: Re: xfs: very slow after mount, very slow at umount

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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