Technical data

Managing Storage Media
9.8 Mounting Tape Volume Sets
4. You can check the densities, volume labels, UICs, and relative volume
numbers of the volumes that are mounted on devices. To do so, specify
the SHOW DEVICES/FULL command. If you specify a generic device code
for the tape drives, such as MU, information is displayed for all drives of that
type configured in the system.
To display information for a volume mounted on a specific drive, specify the
physical device code, consisting of the generic device code, the controller
designation, and the unit number followed by a colon.
For more information about the SHOW DEVICES command, including
examples of displays returned by the SHOW DEVICES/FULL command,
see Section 8.2 or the OpenVMS DCL Dictionary.
Examples
1.
$ ALLOCATE MUA0:
%DCL-I-ALLOC, _MARS$MUA0: allocated
$ ALLOCATE MUA1:
%DCL-I-ALLOC, _MARS$MUA1: allocated
$ ALLOCATE MUA2:
%DCL-I-ALLOC, _MARS$MUA2: allocated
The commands in this example allocate a drive on which you will load each
volume.
2.
$ INITIALIZE/DENSITY=1600/PROTECTION=(G:RW) MUA0: TAPE1
$ INITIALIZE/DENSITY=1600/PROTECTION=(G:RW) MUA1: TAPE2
$ INITIALIZE/DENSITY=1600/PROTECTION=(G:RW) MUA2: TAPE3
The commands in this example initialize the volumes. The commands specify
the density and the access protection in addition to the device name and the
volume identifier.
3.
$ MOUNT MUA0:,MUA1:,MUA2: TAPE1,TAPE2,TAPE3 TEST
%MOUNT-I-MOUNTED, TAPE1 mounted on _MUA0:
%MOUNT-I-MOUNTED, TAPE2 mounted on _MUA1:
%MOUNT-I-MOUNTED, TAPE3 mounted on _MUA2:
The commands in this example mount the volumes. The commands include
the device name and volume identifier.
9.8.2 Mounting Continuation Volumes in a Tape Volume Set
When mounting a tape volume set, follow the general procedures described in
Section 9.8.1. Once you create the volume set, you do not need to initialize the
volumes when you mount the volume set.
Allocating a drive for each volume in the volume set is not necessary. The
tape file system requests that volumes be switched to appropriate drives when
continuation volumes are required.
The operating system stores, but cannot verify, the identifiers of volumes you
specify but do not physically mount on drives at mount time. The system later
verifies the volume identifiers when the volumes are accessed.
9–52 Managing Storage Media