Execute: fstyp -v <block_device>

The block size is contained in the f_frsize field (not in the f_bsize field!).

Example:

# fstyp -v /dev/vg00/lvol10
vxfs
version: 6
f_bsize: 8192
f_frsize: 1024
f_blocks: 2097152
f_bfree: 1550429
f_bavail: 1453528
f_files: 391732
f_ffree: 387604
f_favail: 387604
f_fsid: 1073741834
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 9
f_size: 2097152

In this case the blocksize is 1024.

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