From: Matthias Schniedermeyer <ms@citd.de>
To: Stan Hoeppner <stan@hardwarefreak.com>
Cc: Hillel Lubman <shtetldik@gmail.com>, xfs@oss.sgi.com
Subject: Re: What is a recommended XFS sector size for hybrid (512e) advanced format hard drives?
Date: Tue, 6 Jan 2015 09:35:07 +0100 [thread overview]
Message-ID: <20150106083507.GA9943@citd.de> (raw)
In-Reply-To: <54AA0A93.2010204@hardwarefreak.com>
On 04.01.2015 21:52, Stan Hoeppner wrote:
> On 01/04/2015 06:56 PM, Hillel Lubman wrote:
> ...
> > Looking around I saw some references that it's preferable to use sector
> > size (sectsz) of 4 KB when creating XFS partitions on hybrid (512e)
> > advanced format hard drives and also some mentions of making that a
> > default in mkfs.xfs. However I noticed that my current mkfs.xfs (3.2.1)
> > used with current Debian testing (Linux 3.16.0) still uses 512 B sectors
> > by default.
> ...
> > Can you please clarify what after all is the recommended sector size for
> > such drives and why isn't it a default in mkfs.xfs (since supposedly
> > defaults are generally recommended optimal settings unless you have some
> > special use case).
> ...
>
> XFS sectsz is unimportant with these drives. What matters is that any
> partitions you create start and end on 4KB boundaries. This will
> prevent adjacent hardware sector RMW internal to the drive. XFS writes
> in 4KB filesystem blocks on Linux. As long as the fsblocks are aligned
> to the 4KB hardware sectors there's nothing more you can do to avoid
> performance penalties with these drives.
Not in my experience. My first (and lying about it) AF HDD had horrible
write performance until i re'mkfs.xfs'ed it with 4k sector-size. And yes
the aligned was 4k.
But that was many years ago and i don't know if newer XFS (IIRC that was
before delay-log) would behave better. But as all of my storage after
the first AF HDD was either an AF HDD or a SSD i have been formating
everything with 4k sector-size for years.
--
Matthias
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next prev parent reply other threads:[~2015-01-06 8:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-05 0:56 What is a recommended XFS sector size for hybrid (512e) advanced format hard drives? Hillel Lubman
2015-01-05 3:52 ` Stan Hoeppner
2015-01-06 2:23 ` Hillel Lubman
2015-01-06 3:21 ` Stan Hoeppner
2015-01-06 4:01 ` Hillel Lubman
2015-01-06 8:35 ` Matthias Schniedermeyer [this message]
2015-01-06 17:02 ` Eric Sandeen
2015-01-06 19:05 ` Chris Murphy
2015-01-06 19:23 ` Eric Sandeen
2015-01-06 19:42 ` Chris Murphy
2015-01-06 19:55 ` Chris Murphy
2015-01-07 5:31 ` Eric Sandeen
2015-01-07 6:01 ` Chris Murphy
2015-01-07 5:17 ` Hillel Lubman
2015-01-07 5:30 ` Eric Sandeen
2015-01-07 5:36 ` Hillel Lubman
2015-01-07 6:06 ` Chris Murphy
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