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

[Hillel Lubman <shtetldik@gmail.com>]

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On Monday, January 05, 2015 21:21:25 Stan Hoeppner wrote:
> 
> > I didn't test however how it compares to default settings on the
> > same drive which would set it to 512 B.
> 
> As long as your underlying partition is 4KB aligned the only advantage
> you'll likely see with 4B sectsz is a little faster log IO.  So for non
> metadata heavy workloads you won't see any difference between 512B and
> 4KB sectsz.
> 
> Stan

It's actually created by gparted with 1 MB alignment, so it's implicitly 4 KB aligned as well. I guess something else is causing the slowness or it's just subjective. Raw I/O performance test looks normal with hdparm.

Here is what gdisk reports (third partition is the XFS one):

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 3907029168 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): ...
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 2048-sector boundaries
Total free space is 4205 sectors (2.1 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          534527   260.0 MiB   EF00  
   2          534528         1763327   600.0 MiB   0700  
   3         1763328      3904931839   1.8 TiB     0700  
   4      3904931840      3907026943   1023.0 MiB  8200

Regards,
Hillel.


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