On Freitag, 23. Juli 2010 Christoph Hellwig wrote:
> -b size=4096 is the default anyway, for 4k sector drivers you also
>  want -s size=4096, which you do not want for 512 byte sector disks.

Thanks for clarification. Should I use "-s size=4096" despite the drive 
saying 512b sectors? It's a "hidden" 4K sector drive, so maybe declaring 
it extra for XFS helps performance? Or does it not matter at all?
 
> What values do the files
> 
>         /sys/block/<device>/queue/logical_block_size
>         /sys/block/<device>/queue/physical_block_size
>         /sys/block/<device>/alignment_offset
> 
> say about your disk?

512, 512, 0 for a Western Digital D20EARS-00MVWB0 (2TB) which has 4K 
sectors but obviously hides it.

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