1 TAPES
6250/1600 bpi tape drives have been installed for use  with  the 
VAX cluster.  Tapes will be mounted by the operators in much the same
manner as is done for the Cyber system.  Labeled tapes stored in the
tape vault must have identical internal and external labels.  These
labels are six characters long; a two letter prefix assigned by the
laboratory to a group or experiment, followed by a four digit number
assigned by the users.

"NO-VAULT" tapes stored outside the vault system may have any valid
label, but must be properly identified.  The tape wrapper must contain a
'NO-VAULT' sticker, as well as the name of the tape. To avoid confusion
due to duplicate labels, you are urged to also identify your non-vaulted
tapes with your Username and experiment or group name. 

Your program should always address a tape by referring to a logical
device name, and not the actual name of the drive being used. To assign
the first free tape drive to your logical name, use the command 

        $ ALLOCATE MU:   drive-logical

Once a drive has been allocated, you can mount the tape with

        $ MOUNT [/FOR] [/COM="WRITE"]   drive-logical   volume-label

The /FOR option specifies an unlabeled, or foreign, tape.  The /COM
option requests that a write enable ring be placed in the tape. When you
mount a tape interactively, the system will not process further commands
until the tape has been mounted, at which time the system prompt will
reapper. If you wish to cancel a requested mount, type CTRL-Y. You may
communicate with the operator while a mount is in progress by using the
command 

        $ REQUEST "message-text"

When your program has finished using the drive, issue the commands

        $ DISMOUNT logical-name
        $ DEALLOCATE logical-name

Please send mail to user GRIPE on the FNAL VAX Cluster if you have
any questions, problems, or suggestions.
