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From: Jan Engelhardt <jengelh@computergmbh.de>
To: David Miller <davem@davemloft.net>
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: Wed, 13 Feb 2008 00:39:16 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802130032190.14275@fbirervta.pbzchgretzou.qr> (raw)
In-Reply-To: <20080212.152652.217936905.davem@davemloft.net>


On Feb 12 2008 15:26, David Miller wrote:
>
>> (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.

Ok you do have a point there. The GPT users win of course, since it
uses LBA, not cyls, so the number of lost bytes is generally below
a cyl.
On the other hand, the H and S of CHS could be lowered and S increased,
e.g. divide H by 2, divide S by 2, multiply S by 4. This gives a finer
bytes/cylinder granularity.

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

Well it was designed for a different system initially with
a different style of booting.

  reply	other threads:[~2008-02-12 23:39 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
2008-02-12 23:39           ` Jan Engelhardt [this message]
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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