IBM 3270 Manual page 76

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BLKSIZE(n) The size of the blocks of data
in a new data set on your TSO
volume. (This part is optional.
If you want to set the block
size for a new data set, replace
the n with the size you want.
If you omit this part, the block
size will be the same as the
record length. If you included
member name, do not include
this part.)
G
RECFM(x) The record format for a new
data set on your TSO volume:
x = v, f, or u. (This part is
optional. If you want variable,
fixed, or undefined length
records in the data set, replace
the x with v, f, or u. If you
omit this option, you will get
variable length records. If you
included member name, do not
include this part.)
• SPACE(nl,n2) units The amount of space
to be set aside for a new data
set on your TSO volume: nl,
n2, units TRACKS, or
CYLINDERS. (This part is
optional. If you want to set
aside a certain number of
blocks, tracks , or cylinders for
the new data set, replace the
units with the type of space
you want - A VBLOCKS(units),
TRACKS, or CYLINDERS; if
you want A VBLOCKS, include
the value. Then replace nl
with the amount of that space
you want the data set to
occupy . You can also replace
n2 with an amount to be added
if the data set needs more
Sending Files Between a PC and a Host 7-23