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The following are special considerations involving a variety of file types:
CA XCOM Data Transport supports large format data sets. Large format data sets are physical sequential data sets that have an allocation of more than 65,535 tracks on a single DASD volume. The maximum allocation for a large data set is 16,777,215 tracks. These datasets are created by specifying LARGE for the DSNTYPE.
CA XCOM Data Transport supports extended format data sets. These data sets are physical sequential data sets which are stored in a different internal format. This format support data striping and compression. These data sets are created by specifying EXTREQ or EXTPREF for the DSNTYPE. EXTREQ specifies that the file must be allocated in extended format. If resources are not available, EXTPREF specifies that the data set is preferred to be extended format. The data set is allocated as a normal sequential data set. These data sets can only be allocated under SMS control as the striping and compression formats are defined in SMS classes.
CA XCOM Data Transport supports data sets in the Extended Address Space of an Extended Address Volume. The Extended Address Space is the space on a DASD volume beyond cylinder 65,519. Data sets residing in the extended address space are allocated in chunks of 21 cylinders and managed by cylinder. These data sets may also have extended attributes which are not available to data sets residing in track managed space below cylinder 65,520. Extended attributes are specified via the EATTR parameter. These data sets can only be allocated under SMS control as the extended attributes are defined in SMS classes. Below lists the data sets which may reside in the extended address space based on z/OS release.
z/OS 1.10
z/OS 1.11
z/OS 1.12
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