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"	-b block_size_options
		This option specifies the fundamental block size of the filesys‐
		tem.  The valid block_size_options are: log=value or  size=value
		and  only  one  can  be  supplied.   The block size is specified
		either as a base two logarithm value with log=, or in bytes with
		size=.   The default value is 4096 bytes (4 KiB), the minimum is
		512, and the maximum is 65536 (64 KiB).  XFS on Linux  currently
		only supports pagesize or smaller blocks."

Regards,
	Ben