linux-ext4 - Re: [PATCH] blkid: optimize dm_device_is

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Message-id: <20080826194445.GN3392@webber.adilger.int>
Date:	Tue, 26 Aug 2008 13:44:45 -0600
From:	Andreas Dilger <adilger@....com>
To:	Theodore Tso <tytso@....edu>
Cc:	Karel Zak <kzak@...hat.com>, linux-ext4@...r.kernel.org,
	Eric Sandeen <sandeen@...hat.com>, mbroz@...hat.com,
	agk@...hat.com
Subject: Re: [PATCH] blkid: optimize dm_device_is_leaf() usage

On Aug 26, 2008  10:47 -0400, Theodore Ts'o wrote:
> I don't think you mean multipath support in terms of where there are
> multiple paths to the same physical device ala fiber channel, but
> rather where are multiple devices which are built on each other,
> right?  So where /dev/sda is used to create the LVM PV's, and so on,
> right?

No, in fact DM has actual mutliple-paths-to-the-same-device support,
via "dm-multipath".

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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