Memorex MT2028D-BLK User Manual download pdf (Page 17)

Chapter 3: StorageTek 4400 Interface

The DYNVM extension provides an interface with the StorageTek 4400

Automated Cartridge Subsystem (ACS) to aid in mounting and dismounting

cartridge volumes and reduce operator intervention required to satisfy

requests for tape volumes. Enabling this interface removes the requirement of

having an operator search for and mount a volume for a VSE request while

also removing the need for a response to DYNVM for a mount request.

The interface is a two-way IUCV interface between the DYNVM extension and

the service machine used for the ACS. It is initialized by DYNVM during its

initialization process. If this interface becomes disabled for any reason (for

example, the ACS server is shut down), DYNVM attempts to reestablish the

interface as soon as it becomes available.

Mount Requests

The following are the mount/dismount requests that may be encountered

when using the DYNVM-ACS interface:

Request Description

Scratch Volume Mount The DYNVM extension requests a scratch volume from the ACS to use for

processing any scratch requests that can be allocated on a cartridge volume.

DYNVM verifies that the volume is a valid scratch tape and then instructs the

volume to be mounted on an available drive. No operator intervention is

needed.

Active Volume Mount The DYNVM extension requests the ACS to check if the specific volume mounts

(Input or Output) reside there. If so, DYNVM then requests the volume to be

mounted on an available drive. No operator intervention is needed.

Volume Dismount Whenever an ACS volume is unloaded from a drive, DYNVM requests that the

ACS remove the volume from the drive and return it to ACS storage. If the

volume is a FOREIGN volume, the volume is ejected from the ACS, requiring

the operator to retrieve it.

CA Dynam/T VSE Interface

Mount requests passed to the DYNVM extension from CA Dynam/T VSE are

processed as Scratch and Active Mount requests.

Chapter 3: StorageTek 4400 Interface 3–1

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Memorex MT2028D-BLK User Manual Page 17