Disk space is allocated by the system in 1024-byte sectors.
An integral number of sectors are grouped together to form a logical
block. VxFS supports logical block sizes of 1024, 2048, 4096, and
8192 bytes. The default block size is 1024 bytes for file systems
less than 3 gigabytes; 2048 bytes for file systems less than 16
gigabytes; 4096 bytes for file systems less than 32 gigabytes; and
8192 bytes for file systems 32 gigabytes or larger. The block size
may be specified as an argument to the mkfs utility and may vary between VxFS file systems
mounted on the same system. VxFS allocates disk space to files in
extents. An extent is a set of contiguous blocks.
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