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4.2. mkfs - Allocation Block Size

Specify the fundamental allocation block size of the filesystem.
The default value is 4KB, the minimum is 512 bytes, and the maximum is 64KB
XFS on Linux currently only supports pagesize or smaller blocks.
To create a filesystem with a block size of 2048 bytes you would use:
mkfs.xfs -b size=2048 device
Smaller block sizes reduce wasted space for lots of small files.