linux-kernel - Re: [dm-devel] REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory.

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Message-ID: <yq1fxdoqkec.fsf@sermon.lab.mkp.net>
Date:	Thu, 25 Jun 2009 13:43:23 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	John Robinson <john.robinson@...nymous.org.uk>
Cc:	NeilBrown <neilb@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alasdair G Kergon <agk@...hat.com>, jens.axboe@...cle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>
Subject: Re: [dm-devel] REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory.

>>>>> "John" == John Robinson <john.robinson@...nymous.org.uk> writes:

John> Even sadder, when a raid 0/4/5/6 is reshaped over more discs (and
John> probably other scenarios outwith md),

I'm not sure I agree with the whole "sad" sentiment.  Just because
ext[234] doesn't query devices automatically doesn't mean the technology
doesn't exist.  I wrote the MD/LVM extraction code for XFS in 2001.

John> both stripe-width and stride-size change. Is there any prospect
John> this new stacking could give us the opportunity to tell our client
John> (LVM, filesystem, whatever) about the change, or that they'll be
John> able to take advantage of it?

When you resize the fs it would have to compare the new topology to the
old one and adjust accordingly.

-- 
Martin K. Petersen	Oracle Linux Engineering
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