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From: Michael Monnerie <michael.monnerie@is.it-management.at>
Subject: Re: 4k sector drives
Date: Fri, 23 Jul 2010 12:59:07 +0200
References: <201007211333.48363.eye.of.the.8eholder@gmail.com>
	<201007230809.28111@zmi.at> <20100723095832.GA23174@infradead.org>
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Cc: Christoph Hellwig <hch@infradead.org>

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On Freitag, 23. Juli 2010 Christoph Hellwig wrote:
> -b size=3D4096 is the default anyway, for 4k sector drivers you also
>  want -s size=3D4096, which you do not want for 512 byte sector disks.

Thanks for clarification. Should I use "-s size=3D4096" despite the drive=20
saying 512b sectors? It's a "hidden" 4K sector drive, so maybe declaring=20
it extra for XFS helps performance? Or does it not matter at all?
=20
> What values do the files
>=20
>         /sys/block/<device>/queue/logical_block_size
>         /sys/block/<device>/queue/physical_block_size
>         /sys/block/<device>/alignment_offset
>=20
> say about your disk?

512, 512, 0 for a Western Digital D20EARS-00MVWB0 (2TB) which has 4K=20
sectors but obviously hides it.

=2D-=20
mit freundlichen Gr=FCssen,
Michael Monnerie, Ing. BSc

it-management Internet Services
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