What is a recommended XFS sector size for hybrid (512e) advanced format hard drives?

[Hillel Lubman]

On Tuesday, January 06, 2015 11:02:09 Eric Sandeen wrote:
> 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 at sandeen ~]# blockdev --getss --getpbsz /dev/sde
> 512
> 4096
> ...
> 
> however, some drives lie about these sizes, and then mkfs.xfs can't know.
> Try the blockdev command above to see.
> 

I see. Indeed, on the drive where I get sectsz as 512 by default, blockdev --getss --getpbsz reports:
512
512

However hdparm -I reports:
Logical  Sector size:    512 bytes
Physical Sector size:     4096 bytes

So is it still worthwhile making sectsz 4 KB explicitly instead of using mkfs.xfs default in such case? And on a side note, since there is a more reliable way to figure that info out, may be mkfs.xfs should rather use that?

Regards,
Hillel.
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