From: Michael Monnerie <michael.monnerie@is.it-management.at>
To: xfs@oss.sgi.com
Cc: Christoph Hellwig <hch@infradead.org>
Subject: Re: 4k sector drives
Date: Fri, 23 Jul 2010 12:59:07 +0200 [thread overview]
Message-ID: <201007231259.11714@zmi.at> (raw)
In-Reply-To: <20100723095832.GA23174@infradead.org>
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On Freitag, 23. Juli 2010 Christoph Hellwig wrote:
> -b size=4096 is the default anyway, for 4k sector drivers you also
> want -s size=4096, which you do not want for 512 byte sector disks.
Thanks for clarification. Should I use "-s size=4096" despite the drive
saying 512b sectors? It's a "hidden" 4K sector drive, so maybe declaring
it extra for XFS helps performance? Or does it not matter at all?
> What values do the files
>
> /sys/block/<device>/queue/logical_block_size
> /sys/block/<device>/queue/physical_block_size
> /sys/block/<device>/alignment_offset
>
> say about your disk?
512, 512, 0 for a Western Digital D20EARS-00MVWB0 (2TB) which has 4K
sectors but obviously hides it.
--
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next prev parent reply other threads:[~2010-07-23 10:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-21 10:33 4k sector drives Khelben Blackstaff
2010-07-21 12:21 ` Michael Monnerie
2010-07-23 6:09 ` Michael Monnerie
2010-07-23 9:58 ` Christoph Hellwig
2010-07-23 10:42 ` Stan Hoeppner
2010-07-23 10:47 ` Christoph Hellwig
2010-07-23 12:41 ` Stan Hoeppner
2010-07-23 10:59 ` Michael Monnerie [this message]
2010-07-23 12:56 ` Emmanuel Florac
2010-07-23 13:10 ` Stan Hoeppner
2010-07-23 13:38 ` Matthias Schniedermeyer
2010-07-23 13:50 ` Emmanuel Florac
2010-07-23 14:13 ` Matthias Schniedermeyer
2010-07-24 8:47 ` Christoph Hellwig
2010-07-24 21:07 ` Eric Sandeen
2010-07-24 22:35 ` Michael Monnerie
2010-07-25 15:33 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2010-07-23 15:02 Khelben Blackstaff
2010-07-23 15:28 ` Emmanuel Florac
2010-07-23 9:19 Khelben Blackstaff
2010-07-21 7:53 Khelben Blackstaff
2010-07-21 9:14 ` Michael Monnerie
2010-07-21 10:33 ` Emmanuel Florac
2010-07-20 18:58 Michael Monnerie
2010-07-20 20:30 ` Stan Hoeppner
2010-07-20 20:39 ` Emmanuel Florac
2010-07-20 21:34 ` Michael Monnerie
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