Support for virtual tapes of numerous gigabytes, such as EMC product DLM6000

Document ID : KB000020776
Last Modified Date : 14/02/2018
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The EMC product called DLM6000 supports virtual tapes of numerous gigabytes. Clients may want information as to whether IDMS supports these devices.


Larger virtual tapes pose no problem for IDMS. To us they would appear to be basically just a longer tape. As long as you use acceptable block sizes everything should be fine. These devices are fully functional for all IDMS activities including recovery using the ROLLFORWARD SEQUENTIAL option, which works as long as the data source can read backwards. If some future version of this device, or a similar device, does not support being read backwards, the ROLLFORWARD would need to use the SORTED parameter. FICON is used to connect the mainframe to the DLM devices, which are represented to the mainframe as IBM 3480, 3490, and 3590 tape drives. More details can be found on these links: