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PDP-10 Archives
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BB-BT99T-BB_1990
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10,7/system/dismou.hlp
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DISMOUNT Command
Function
The DISMOUNT command relinquishes ownership of a device. It does
not affect your allocation requests, if you have used the
ALLOCATE command, and you can MOUNT the device again. Once you
have dismounted a volume set, the device is available to other
users. However, if the resource was not allocated with the
ALLOCATE command DISMOUNT performs an implicit DEALLOCATE.
If you used the ALLOCATE command for the resource, the DISMOUNTed
resource remains in an allocated state until you issue the
DEALLOCATE command. Once you have dismounted a volume set, your
programs can no longer reference the resource by the logical name
except with the MOUNT and DEALLOCATE commands.
Format
DISMOUNT resource-name/switch,resource-name/switch,...
Where: For disk volume sets, the resource-name is the volume
set-name or the logical name.
For tape volume sets, the resource-name is the logical
name.
You can use the following switches in the command string:
Switch Function
/HELP Prints a short description of the command. If you
specify any resource names with this switch, they
will be ignored.
/NONOTIFY Does not set the system to notify your job when
the dismount is complete. This is the default
function if you have not specified /NOWAIT.
/NOTIFY Sets the system to notify your job when the
dismount is complete. If you specify /NOWAIT,
this is the default function.
/NOWAIT Allows your job to return to monitor level before
the dismount is complete. This implies /NOTIFY.
/REMOVE Removes the specified file structure from your
job's search list. If no other jobs are accessing
the structure, and if it is not a system
structure, the operator physically dismounts it.
/WAIT Holds your job until the dismount is complete.
This is the default function.
Associated Commands
ALLOCATE Informs the system of your future need for a
resource.
DEALLOCATE Removes the resource from your job's list of
allocated resources. If the resource has not
been dismounted, DEALLOCATE dismounts it.
MOUNT Requests ownership of the resource(s).
SHOW ALLOCATION Prints a list of the resources that are
allocated and mounted for your job.
SHOW QUEUE Prints a list of the requests in the system
queues.
Characteristics
Runs the QUEUE program.
Destroys your core image.
Requires LOGIN.
Examples
1. The following example shows the use of the ALLOCATE,
DEALLOCATE, MOUNT, DISMOUNT, and SHOW ALLOCATION commands.
The resources are reserved for a multivolume tape volume set
with the ALLOCATE command. The name of the volume set is
TAPE-SET, and it contains three volumes. The logical name TS
is assigned to the tape set. The tape is write enabled, and
it does not have standard labels.
.ALLOCATE TAPE-SET(VOL1,VOL2,VOL3):TS/WRITE-ENABLE
/LABEL:NONE<RET>
[ALLOCATE REQUEST TS QUEUED, REQUESTS #672]
A file structure named DSKR: is mounted for the job:
.MOUNT DSKR:<RET>
[MOUNT REQUEST DSKR QUEUED, REQUEST #673]
[STRUCTURE DSKR MOUNTED]
The job's resources are displayed using the SHOW ALLOCATION
command:
.SHOW ALLOCATION<RET>
ALLOCATION FOR JOB 59 MARY MAROTTA [27,5434]
VOLUME SET RESOURCES TYPE ALL OWN
-------------------- ----------------- ------------ --- ---
--- 9 TK 800/1600 MAGTAPE UNIT 1 0
--- RP06 DISK UNIT 2 2
--- RP20 DISK UNIT 1 1
DSKB DSKB STRUCTURE 1 1
DSKC DSKC STRUCTURE 1 1
DSKR DSKR STRUCTURE 1 1
TAPE-SET VOL1 MAGTAPE VOL. 1 0
TAPE-SET VOL2 MAGTAPE VOL. 1 0
TAPE-SET VOL3 MAGTAPE VOL. 1 0
The tape set is mounted, and the resources are again
displayed:
.MOUNT TS<RET>
[MOUNT REQUEST TS QUEUED, REQUEST #673]
[MAGTAPE TS MOUNTED]
.SHOW ALLOCATION<RET>
ALLOCATION FOR JOB 59 MARY MAROTTA [27,5434]
VOLUME SET RESOURCES TYPE ALL OWN
-------------------- ----------------- ------------ --- ---
--- 9TK 800/1600 MAGTAPE UNIT 1 1
--- RP06 DISK UNIT 2 2
--- RP20 DISK UNIT 1 1
DSKB DSKB STRUCTURE 1 1
DSKC DSKC STRUCTURE 1 1
DSKR DSKR STRUCTURE 1 1
TAPE-SET VOL1 MAGTAPE VOL. 1 1
TAPE-SET VOL2 MAGTAPE VOL. 1 0
TAPE-SET VOL3 MAGTAPE VOL. 1 0
After work with the tape set and the structure is finished,
the structure is dismounted. Because the structure was not
explicitly allocated, it is automatically deallocated.
.DEALLOCATE DSKR<RET>
[STRUCTURE DSKR DISMOUNTED]
The tape volume set is dismounted:
.DISMOUNT TS<RET>
[VOLUME SET TS DISMOUNTED]
The job's resources are displayed:
.SHOW ALLOCATION<RET>
ALLOCATION FOR JOB 59 MARY MAROTTA [27,5434]
VOLUME SET RESOURCES TYPE ALL OWN
-------------------- ----------------- ------------ --- ---
--- 9 TK 800/1600 MAGTAPE UNIT 1 0
--- RP06 DISK UNIT 1 1
--- RP20 DISK UNIT 1 1
DSKB DSKB STRUCTURE 1 1
DSKC DSKC STRUCTURE 1 1
TAPE-SET VOL1 MAGTAPE VOL. 1 0
TAPE-SET VOL2 MAGTAPE VOL. 1 0
TAPE-SET VOL3 MAGTAPE VOL. 1 0
At this point, the tape set can again be mounted, or it can
be deallocated. The tape set is deallocated:
.DEALLOCATE TS<RET>
[VOLUME SET TS HAS BEEN DEALLOCATED]
.SHOW ALLOCATION<RET>
ALLOCATION FOR JOB 59 MARY MAROTTA [27,5434]
VOLUME SET RESOURCES TYPE ALL OWN
-------------------- ----------------- ------------ --- ---
--- RP06 DISK UNIT 1 1
--- RP20 DISK UNIT 1 1
DSKB DSKB STRUCTURE 1 1
DSKC DSKC STRUCTURE 1 1
.
2. In this example, you knew that the job was the only one using
the structure BLKJ: and included a /REMOVE switch, so that
the operator would remove the disk pack from the drive. The
message "BLKJ DISMOUNTED" means that BLKJ: is no longer in
your search list, and that a request has been queued to the
operator to remove the pack from the drive. The message does
not mean that BLKJ has already been physically removed.
Because this command implies /NOWAIT, you will not receive
notification of the physical removal of the disk pack.
.DISMOUNT BLKJ/REMOVE<RET>
[BLKJ DISMOUNTED]
3. The following DISMOUNT/WAIT command causes the job to suspend
further processing until all pending dismount requests from
it have been completed. There were no pending dismount
requests from this job, so the job returns to monitor level
immediately.
.DISMOUNT/WAIT<RET>
NONE PENDING FOR YOUR JOB
.