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1 DISMOUNT

Closes a mounted disk or tape volume for further processing and deletes the logical name associated with the device. Requires the GRPNAM (group logical name) and SYSNAM (system logical name) privileges to dismount group and system volumes. Format DISMOUNT device-name[:] 2 Parameter device-name[:] Name of the device containing the volume-either a logical name or a physical name. If a physical name is specified, the controller defaults to A and the unit defaults to 0. If the volume currently mounted on the device is a member of a disk or tape volume set, all volumes in the set are dismounted, unless the /UNIT qualifier is specified. 2 Qualifiers /ABORT Requires volume ownership or the user privilege VOLPRO (volume protection) to use this qualifier with a volume that was mounted with neither the /GROUP nor the /SYSTEM qualifier. Additionally requires the user privilege SHARE if the volume is mounted privately by a process other than the process issuing the DISMOUNT command. Specifies that the volume is to be dismounted, regardless of who mounted it. The primary purpose of the /ABORT qualifier is to terminate mount verification. The DISMOUNT/ABORT command also cancels any outstanding I/O requests. If the volume was mounted with the /SHARE qualifier, the /ABORT qualifier causes the volume to be dismounted for all of the users who mounted it. /CLUSTER Dismounts a volume throughout a dual-architecture OpenVMS Cluster system. If you specify DISMOUNT/CLUSTER, the DISMOUNT command checks for open files or other conditions that will prevent a Files-11 volume on the local node from dismounting. If the DISMOUNT command does not find any open files or other conditions, it checks for conditions on all other nodes in the OpenVMS Cluster. If the DISMOUNT command finds one of the conditions on any node, it displays an error message identifying the device and the nodes on which the error occurred, followed by an error message indicating open files or other conditions on the volume. After the DISMOUNT command successfully dismounts the volume on the local node, it dismounts the volume on every other node in the existing OpenVMS Cluster environment. If the system is not a member of a cluster, the /CLUSTER qualifier has no effect. /OVERRIDE /OVERRIDE=CHECKS Marks a Files-11 volume for dismounting even if files are open on the volume. If you specify DISMOUNT/OVERRIDE=CHECKS, the DISMOUNT command displays messages indicating any open files or other conditions that prevent dismounting, immediately followed by a message indicating that the volume has been marked for dismounting. A substantial amount of time can pass between the time you enter the DISMOUNT/OVERRIDE=CHECKS command and the completion of the dismount operation. Always wait for the dismount to complete before you remove the volume. (To verify that the dismount has completed, enter the SHOW DEVICES command.) Note that the final phase of volume dismounting occurs in the file system, and all open files on the volume must be closed before the actual dismount can be done. Note also that the file system cannot dismount a volume while any known file lists associated with it contain entries. /UNIT Dismounts only one volume of a volume set on the specified device. By default, all volumes in a set are dismounted. NOTE Avoid dismounting the root volume of a volume set, because it contains the master file directory (MFD). It may be impossible to access files on a volume set if the MFD is not accessible. /UNLOAD /UNLOAD /NOUNLOAD Determines whether the device on which the volume is mounted is physically unloaded. If you specify the DISMOUNT command without the /UNLOAD or the /NOUNLOAD qualifier, the qualifier that you specified with the MOUNT command (either /UNLOAD or /NOUNLOAD) determines whether the volume is unloaded physically. 2 Examples 1.$ MOUNT MTA0: PAYVOL TAPE . . . $ DISMOUNT TAPE The MOUNT command in this example mounts the tape whose volume identification is PAYVOL on the device MTA0: and assigns the logical name TAPE to the device. By default, the volume is not shareable. The DISMOUNT command releases access to the volume, deallocates the device, and deletes the logical name TAPE. 2.$ MOUNT/SHARE DBA3: DOC_FILES . . . $ DISMOUNT DBA3: The MOUNT command in this example mounts the volume labeled DOC_FILES on the device DBA3. Other users can enter MOUNT commands to access the device. The DISMOUNT command shown in this example deaccesses the device for the process issuing the command. If other users still have access to the volume, the volume remains mounted for their process or processes. 3.$ DISMOUNT/NOUNLOAD DMA2: The DISMOUNT command in this example dismounts the volume; the /NOUNLOAD qualifier requests that the volume remain in a ready state. 4.$ MOUNT/BIND=PAYROLL DMA1:,DMA2: PAYROLL01,PAYROLL02 . . . $ DISMOUNT/UNIT DMA2: The MOUNT command in this example mounts PAYROLL, a two- volume set. The DISMOUNT command dismounts only PAYROLL02, leaving PAYROLL01 accessible. Note that because the master file directory (MFD) for the volume set is on the root volume, you should not dismount the root volume (in this case, PAYROLL01) of the volume set. 5.$ DISMOUNT $10$DJA100 %DISM-W-CANNOTDMT, $10$DJA100: cannot be dismounted %DISM-W-INSWPGFIL, 4 swap or page files installed on volume %DISM-W-SPOOLEDEV, 3 devices spooled to volume %DISM-W-INSTIMAGE, 7 images installed on volume %DISM-W-USERFILES, 6 user files open on volume The DISMOUNT command in this example displays the open files and other conditions that prevent device $10$DJA100 from dismounting. 6.$ DISMOUNT/CLUSTER $10$DJA100 %DISM-W-RMTDMTFAIL, $10$DJA100: failed to dismount on node SALT %DISM-W-FILESOPEN, volume has files open on remote node %DISM-W-RMTDMTFAIL, $10$DJA100: failed to dismount on node PEPPER %DISM-W-FILESOPEN, volume has files open on remote node %DISM-W-CANNOTDMT, $10$DJA100: cannot be dismounted The DISMOUNT command in this example displays messages identifying device $10$DJA100 and nodes SALT and PEPPER on which errors occurred followed by messages indicating open files on the volume.

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