File attributes describe the organization and format of the data
in the transport file that is transferred to a target computer. A
transport file must have these attribute values:
Logical record length
(LRECL)
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Note: In
some cases, a block size value of less than 8000 bytes might be more
efficient for your storage device. The block size value must be an
exact multiple of the logical record length value.
CAUTION:
For z/OS
only, you must specify a Block Size that is 80 or a multiple of 80
(for example, 160, 240, 320).
Although not required,
file attributes can be set for all other source computers. File attributes
are declared according to the source computer that the transport file
is created on and the transfer method used.
In addition, you must
specify file attributes for files in operating environments that require
them by using the communications software protocol. For example, if
you transfer a transport file from a UNIX operating environment to
a
z/OS operating environment, you must specify file attributes through
the communications software.
Besides setting file
attributes for those operating environments that require it, ensure
that your communications software does not alter the default file
attribute settings for any operating environment.
Alternatively, in order
to transfer a transport file from a source computer to tape and then
from tape to disk at the target computer, you use operating environment-specific
commands that define the input and output devices for the operating
environments involved in the transfer.
After the transport
file is created, it must then be transferred to the target computer
either across the network or by means of a mountable magnetic medium
such as a disk or a tape.
File attributes that
are set incorrectly can corrupt or invalidate a transport file.
For details about setting
file attributes or using tape commands for these operating environments,
see the appropriate topic: