From: Douglas Gilbert <dougg@torque.net>
To: Bryan Henderson <hbryan@us.ibm.com>
Cc: Jeff Garzik <jeff@garzik.org>,
Jan Engelhardt <jengelh@linux01.gwdg.de>,
linux-fsdevel@vger.kernel.org,
Linux-ide <linux-ide@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
Ric Wheeler <ric@emc.com>
Subject: Re: impact of 4k sector size on the IO & FS stack
Date: Mon, 12 Mar 2007 15:16:07 -0400 [thread overview]
Message-ID: <45F5A6F7.9080108@torque.net> (raw)
In-Reply-To: <OFCF49F323.33FDF27D-ON8825729C.0064FD4B-8825729C.0065C420@us.ibm.com>
Bryan Henderson wrote:
>> DOS partitions start partitions on odd-numbered sectors
>
> I don't get this. If you mean partitions defined by the classic DOS
> partition table format, then AFAICS, such a partition can start in any
> sector.
Bryan,
Typically the first partition on a DOS partitioned disk
starts at the next available sector after the mbr
which, for some bizarre reason, is 63 sectors long.
Hence:
# fdisk -lu /dev/hda
Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 63 18314099 9157018+ c W95 FAT32 (LBA)
/dev/hda2 18314100 19551104 618502+ 82 Linux swap / Solaris
/dev/hda4 19551105 156296384 68372640 83 Linux
>
>> so presuming you have odd-aligned disks, life is good.
>
> What is an odd-aligned disk?
s/disk/partition/ ?
Perhaps hda1 and hda4 above are examples.
Doug Gilbert
next prev parent reply other threads:[~2007-03-12 19:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-11 22:51 impact of 4k sector size on the IO & FS stack Ric Wheeler
2007-03-11 23:14 ` Jan Engelhardt
2007-03-12 2:45 ` Ric Wheeler
2007-03-12 3:27 ` Jan Engelhardt
2007-03-12 3:46 ` Andreas Dilger
2007-03-12 12:17 ` Alan Cox
2007-03-12 14:41 ` Jeff Garzik
2007-03-12 14:36 ` Jeff Garzik
2007-03-12 15:45 ` Alan Cox
2007-03-12 18:31 ` Bryan Henderson
2007-03-12 18:37 ` Sergei Shtylyov
2007-03-12 20:52 ` Bryan Henderson
2007-03-12 19:16 ` Douglas Gilbert [this message]
2007-03-12 19:28 ` Jeff Garzik
2007-03-12 0:02 ` Alan Cox
2007-03-12 0:44 ` Jeff Garzik
2007-03-12 2:37 ` Ric Wheeler
2007-03-12 12:24 ` Alan Cox
2007-03-12 13:32 ` Ric Wheeler
2007-03-12 15:21 ` Douglas Gilbert
2007-03-12 16:08 ` Martin K. Petersen
2007-03-12 14:26 ` Jeff Garzik
2007-03-13 5:11 ` Andreas Dilger
2007-03-13 6:34 ` Chris Wedgwood
2007-03-12 2:41 ` Ric Wheeler
2007-03-12 8:18 ` Christoph Hellwig
2007-03-12 14:40 ` James Bottomley
2007-03-12 14:45 ` Jeff Garzik
2007-03-12 14:57 ` Christoph Hellwig
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