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Date: Tue, 06 Jan 2015 11:02:09 -0600
From: Eric Sandeen <sandeen@sandeen.net>
MIME-Version: 1.0
Subject: Re: What is a recommended XFS sector size for hybrid (512e) advanced
	format hard drives?
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To: Hillel Lubman <shtetldik@gmail.com>, xfs@oss.sgi.com

On 1/4/15 6:56 PM, Hillel Lubman wrote:
> Hi.


> 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).

It is indeed the default.  

[root@sandeen ~]# blockdev --getss --getpbsz /dev/sde
512
4096
[root@sandeen ~]# mkfs.xfs /dev/sde
meta-data=/dev/sde               isize=256    agcount=1, agsize=4097 blks
         =                       sectsz=4096  attr=2, projid32bit=0
data     =                       bsize=4096   blocks=4097, imaxpct=25
         =                       sunit=1      swidth=8 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal log           bsize=4096   blocks=1424, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0


however, some drives lie about these sizes, and then mkfs.xfs can't know.
Try the blockdev command above to see.

-Eric

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