The device does not support the Read Multiple Count, Key, and Data or Read Track channel commands; or I/O errors were encountered in testing whether the Read Multiple Count, Key, and Data and Read Track channel commands are supported on the device. OPTIMIZE(2), OPTIMIZE(3), and OPTIMIZE(4) are applicable only if one of these channel commands is supported. This can also occur if the device can be accessed through multiple control units. Some control units support either channel command and others do not.
OPTIMIZE(1) is used to run the DUMP function.
None.
To get the performance advantages, ensure that all control units attached to the device support the Read Multiple Count, Key, and Data or Read Track channel commands.
DFSMSdss