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From: David Miller <davem@davemloft.net>
To: jengelh@computergmbh.de
Cc: chris.mason@oracle.com, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, btrfs-devel@oss.oracle.com
Subject: Re: BTRFS partition usage...
Date: Tue, 12 Feb 2008 15:26:52 -0800 (PST)	[thread overview]
Message-ID: <20080212.152652.217936905.davem@davemloft.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0802121458420.21102@fbirervta.pbzchgretzou.qr>

From: Jan Engelhardt <jengelh@computergmbh.de>
Date: Tue, 12 Feb 2008 15:00:20 +0100 (CET)

> (Yes, I had xfs on sparc before, so it's not like you NEED the 
> whitespace at the start of a partition.)

You actully do unless you want to lose significant chunks of your disk
space.

The Sun disk label only allows you to specify the start of a partition
in cylinders, so if you want to use a filesystem like XFS you have to
start the partition on cylinder 1 which can be many blocks into the
disk.  That entire first cylinder is completely wasted.

What XFS does by putting the superblock at zero is simply does not
take these kinds of issues into consideration.

  parent reply	other threads:[~2008-02-12 23:26 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 17:00 [ANNOUNCE] Btrfs v0.12 released Chris Mason
2008-02-11  1:12 ` David Miller
2008-02-11 13:42   ` Chris Mason
2008-02-12  6:43     ` David Miller
2008-02-12 13:43       ` Chris Mason
2008-02-12  7:21 ` BTRFS partition usage David Miller
2008-02-12  8:11   ` David Miller
2008-02-12 13:49     ` Chris Mason
2008-02-12 14:00       ` Jan Engelhardt
2008-02-12 14:08         ` Chris Mason
2008-02-12 14:21           ` Jan Engelhardt
2008-02-12 14:35             ` Chris Mason
2008-02-12 15:04               ` Jan Engelhardt
2008-02-12 16:17                 ` Chris Mason
2008-02-12 23:38                 ` David Miller
2008-02-12 23:42                   ` Jan Engelhardt
2008-02-13  1:09                     ` David Miller
2008-02-13  1:22                     ` Rene Herman
2008-02-12 23:35               ` David Miller
2008-02-13  7:02                 ` Christoph Hellwig
2008-02-12 23:34             ` David Miller
2008-02-12 23:33           ` David Miller
2008-02-13  2:10             ` Jeff Garzik
2008-02-14  0:51               ` Szabolcs Szakacsits
2008-02-12 23:26         ` David Miller [this message]
2008-02-12 23:39           ` Jan Engelhardt
2008-02-13  1:08             ` David Miller
2008-02-13  1:25           ` Bryan Henderson
2008-02-12 23:28         ` David Miller
2008-02-13  0:45           ` Theodore Tso
2008-02-12 20:50       ` David Miller
2008-02-12  9:23 ` CRC32C big endian bugs David Miller
2008-02-12 21:55 ` BTRFS only works with PAGE_SIZE <= 4K David Miller
2008-02-12 22:03   ` Chris Mason

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