The BLOCKSIZE specifier indicates the physical I/O transfer size for the file. It takes the following form:
BLOCKSIZE = bks
bks |
Is a scalar numeric expression. If necessary, the value is converted to integer data type before use. |
If you specify a nonzero number for bks, it is rounded up to a multiple of 512 byte blocks.
If you do not specify BLOCKSIZE or you specify zero for bks, the filesystem default value is assumed.
Note that blocksize is meaningful for sequential access only.