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From: Eric Sandeen <sandeen@sandeen.net>
To: Matthias Schniedermeyer <ms@citd.de>
Cc: xfs@oss.sgi.com
Subject: Re: What are the correct mkfs.xfs parameters for a lying WD-EARS HDD?
Date: Mon, 08 Mar 2010 16:45:23 -0600	[thread overview]
Message-ID: <4B957E03.9090000@sandeen.net> (raw)
In-Reply-To: <20100308221044.GA17830@citd.de>

Matthias Schniedermeyer wrote:
> Hi
> 
> 
> More than a month ago i bought 4 Western Digital WD15EARS (1.5 TB) which 
> are (AFAIK) the first general/commercial available 4k sector SATA-HDDs.
> 
> Unfortunatly the HDDs lie about the 4k physical sector size and the most 
> prominent drawback is a worse than abysmal delete performance.
> ("Normal" Read & Write-performance is OK)
> 
> So if i wanted to (re-)mkfs the filesystems what would the correct 
> parameters be?
> 
> Kernel/Userspace is pretty recent (Debian-SID):
> mkfs.xfs version 3.1.1, kernel v2.6.33, util-linux 2.16.0
> Not that that should matter when the HDDs lies.

Recent kernel+util-linux-ng++fdisk+parted+xfsprogs -should- do the right thing for you....
Oh, but this was maybe the drive that didn't output the right stuff when queried.

Make sure your partitions, if any, are on 4k boundaries.(*)  older fdisk at least
won't do this by default, not sure about parted.

once that is done, tell mkfs.xfs "-s size=4096" to set the 4k sector size
(again, all-upstream should do this magically for sane drives)

-Eric

(*)unless the drive has an offset to make 512-sector 63 line up on a nice
boundary... in which case I guess you could experiment with perf both
ways to be sure...

> 
> Bis denn
> 

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  reply	other threads:[~2010-03-08 22:43 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-08 22:10 What are the correct mkfs.xfs parameters for a lying WD-EARS HDD? Matthias Schniedermeyer
2010-03-08 22:45 ` Eric Sandeen [this message]
2010-03-08 23:47   ` Matthias Schniedermeyer
2010-03-09 21:41     ` Matthias Schniedermeyer
2010-03-10  8:26       ` Gim Leong Chin
2010-03-08 23:55   ` Martin K. Petersen
2010-03-09  0:55     ` Eric Sandeen

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