SET, VOLUME
*Conan The Librarian (sorry for the slow response - running on an old VAX)
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VMS Help SET, VOLUME *Conan The Librarian (sorry for the slow response - running on an old VAX) |
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Changes the characteristics of one or more mounted Files-11
volumes. The SET VOLUME command affects only the node on which
the command is issued, and will not affect any other nodes, even
when a volume is mounted on multiple nodes in an OpenVMS Cluster
configuration.
If you are not the owner of the volume, requires control access
to the volume.
Format
SET VOLUME device-name[:][,...]
| 1 - Parameter |
device-name[:][,...]
Specifies the name of one or more mounted Files-11 volumes.
| 2 - Qualifiers |
2.1 - /ACCESSED
/ACCESSED[=n]
Requires OPER (operator) privilege.
Specifies the number of directories to be maintained in system
space for ready access. You can specify a value n in the range
of 0 to 255. If you specify the qualifier /ACCESSED and omit
the number of directories, a default value of 3 is used. If you
specify a value greater than the current value, the new value is
effective immediately; otherwise, the new value is not effective
until the next time the volume is mounted.
2.2 - /DATA_CHECK
/DATA_CHECK[=(option[,...])]
Defines a default for data check operations following all read
and write operations to the specified volume. (If you do not
specify the /DATA_CHECK qualifier, no checks are made.) Possible
keywords are as follows:
READ Performs checks following all read operations.
WRITE Performs checks following all write operations (default).
2.3 - /ERASE_ON_DELETE
/ERASE_ON_DELETE
/NOERASE_ON_DELETE (default)
Determines whether the space occupied by a file is overwritten
with a system-specified pattern when a file on the volume is
deleted.
2.4 - /EXTENSION
/EXTENSION[=n]
Specifies the number of blocks to be used as a default extension
size for all files on the volume. You can specify a value n in
the range of 0 to 65,535. If you specify the /EXTENSION qualifier
without specifying a value, a default value of 0 (the OpenVMS RMS
default) is used.
For example, during an update operation, the extension default
is used when a file increases to a size greater than its initial
default allocation.
2.5 - /FILE_PROTECTION
/FILE_PROTECTION=(ownership[:access][,...])
Sets the default protection to be applied to all files on the
specified disk volume. Specify the ownership parameter as system
(S), owner (O), group (G), or world (W) and the access parameter
as read (R), write (W), execute (E), or delete (D). A null access
specification means no access.
NOTE
This attribute is not used while the volume is in use on an
OpenVMS system, but the attribute is provided to control
the process use of the volume on RSX-11M systems. The
OpenVMS system always uses the default file protection;
the protection can be changed with the DCL command SET
PROTECTION/DEFAULT.
2.6 - /HIGHWATER_MARKING
/HIGHWATER_MARKING
/NOHIGHWATER_MARKING
Determines whether the file highwater mark (FHM) volume attribute
is set. The FHM attribute guarantees that a user cannot read data
that was not written by the user. Applies to Files-11 On-Disk
Structure Level 2 (ODS-2) and 5 (ODS-5) volumes only.
2.7 - /LABEL
/LABEL=volume-label
Specifies a 1- to 12-character ANSI name to be encoded on the
volume. The specified label remains in effect until it is changed
explicitly; dismounting the volume does not affect the label.
Compaq strongly recommends that a volume label should consist
only of alphanumeric characters, dollar signs ($), underscores
(_), and hyphens (-).
If you change the volume label on an OpenVMS system disk, you
should also update the POLYCENTER Software Installation utility
database. To accomplish this, use the PRODUCT REGISTER VOLUME
command to replace the old volume label with the new volume
label.
NOTE
Changing the volume label does not change other structures
that used the original volume label. For example, the
DISK$labelname logical is not changed nor is the device-lock
name that is kept internally by OpenVMS. As a result, if
you attempt to access another disk that has the same volume
label as the original volume of this device, you may get
error messages such as the following: "%MOUNT-F-VOLALRMNT,
another volume of same label already mounted".
Compaq recommends that, if you change a disk volume label,
you also dismount and remount the disk on all nodes in the
cluster so that the names and locks are consistent.
2.8 - /LOG
/LOG
/NOLOG (default)
Determines whether the volume specification of each volume is
displayed after the modification.
2.9 - /MOUNT_VERIFICATION
/MOUNT_VERIFICATION
/NOMOUNT_VERIFICATION
Determines whether mount verification is enabled. Mount
verification prevents interruption to user input/output
operations and notifies the operator of problems with the disk.
2.10 - /OWNER_UIC
/OWNER_UIC[=uic]
Sets the owner user identification code (UIC) of the volume
to the specified UIC. The default UIC is that of the current
process. Brackets ([]) are required around the UIC. Specify
the UIC by using standard UIC format as described in the OpenVMS
Guide to System Security.
2.11 - /PROTECTION
/PROTECTION=(ownership[:access][,...])
Specifies the protection to be applied to the volume. The
following rules apply:
o Specify the ownership parameter as system (S), owner (O),
group (G), or world (W).
o Specify the access parameter as read (R), write (W), create
(C), or delete (D).
The default protection is all types of access by all categories
of user.
2.12 - /REBUILD
/REBUILD[=FORCE]
Recovers caching limits for a volume that was dismounted
improperly. If a disk volume was dismounted improperly (such
as during a system failure), and was then remounted with the
MOUNT/NOREBUILD command, you can use SET VOLUME/REBUILD to
recover the caching that was in effect at the time of the
dismount. The FORCE option forces the disk to be rebuilt
unconditionally, thus updating the free block count in the disk
volume's lock value block.
2.13 - /RETENTION
/RETENTION=(min[,max])
Specifies the minimum and maximum retention times to be used by
the file system to determine the expiration date for files on
the volume. When a file is created, its expiration date is set
to the current time plus the maximum time. Each time the file is
accessed, the current time is added to the minimum time. If the
sum is greater than the expiration date, a new expiration date is
computed.
If you omit the maximum value, a default value that
is the smaller of (2 x min) or (min + 7) days is
used. For example, /RETENTION=3- is the same as
/RETENTION=(3-,6-), while /RETENTION=10- is the same as
/RETENTION=(10-,17-).
The command SET VOLUME/RETENTION=0 disables retention times on
the volume.
2.14 - /STRUCTURE_LEVEL
/STRUCTURE_LEVEL=n
Sets the structure level of the volume. Use the value 5 to set
the volume to ODS-5.
When the /STRUCTURE_LEVEL qualifier is used with other
qualifiers, the volume structure level is set prior to the other
qualifiers being performed.
You cannot use the SET VOLUME command to change a volume from
ODS-5 to ODS-2. To reset a volume to ODS-2, refer to instructions
in the OpenVMS Guide to Extended File Specifications.
NOTE
Compaq does not support creating the system disk as (or
changing it to) an ODS-5 volume.
Refer to the OpenVMS Guide to Extended File Specifications for
further information.
2.15 - /SUBSYSTEM
/SUBSYSTEM
/NOSUBSYSTEM
Enables the processing of subsystem ACEs. Requires the SECURITY
privilege. By default, the disk from which you boot has protected
subsystems enabled but other disks do not. For further details on
subsystems, refer to the OpenVMS Guide to System Security.
2.16 - /UNLOAD
/UNLOAD (default)
/NOUNLOAD
Specifies whether the volume is unloaded (spun down) when the DCL
command DISMOUNT is entered.
2.17 - /USER_NAME
/USER_NAME[=user-name]
Specifies a user name of up to 12 alphanumeric characters to be
recorded on the volume. The default name is the current process
user name.
2.18 - /WINDOWS
/WINDOWS[=n]
Specifies the number of mapping pointers to be allocated for file
windows. The value of n can be from 7 to 80; the default value is
7.
2.19 - /WRITETHROUGH
/WRITETHROUGH
/NOWRITETHROUGH
This qualifier only affects applications such as PATHWORKS that
can request deferred writes to file headers. You use it to
control whether these applications can use the deferred write
feature.
Use /NOWRITETHROUGH to allow these applications to use the
deferred write feature. When one of these applications explicitly
requests a deferred write when updating a file header, control
returns to the application when the I/O request has been queued;
the application does not have to wait until the data is on disk.
Note that although the SHOW DEVICES/FULL command shows the volume
status as write-back caching enabled, the extended file cache
(XFC) will still be in write-through mode.
Use /WRITETHROUGH to disable the deferred write feature, so that
no applications can use it. The SHOW DEVICES/FULL command shows
the volume status as write-through caching enabled.
The deferred write feature is not available on Files-11 ODS-1
volumes.
| 3 - Examples |
1.$ SET VOLUME/DATA_CHECK=(READ,WRITE) DBC5
The SET VOLUME command in this example requests that data
checks be performed following all read and write operations
to DBC5.
2.$ SET VOLUME/FILE_PROTECTION=(S:RWED,O:RWED,G:RE,W:RE) DBC5
The SET VOLUME command in this example sets the default
protection to be applied to all files created on volume DBC5.
System (S) and owner (O) are granted all types of access;
group (G) and world (W) are permitted only to read and execute
files on DBC5.
3.$ SET VOLUME/LABEL=LICENSES DBC5
The SET VOLUME command in this example encodes the label
LICENSES on the volume DBC5. Note that if characters in labels
are entered in lowercase, they are changed to uppercase by the
/LABEL qualifier.
4.$ SET VOLUME/ACCESSED=25/USER_NAME=MANAGER/LOG DKA0:
The SET VOLUME command in this example specifies that 25
directories are to be maintained in system space for ready
access for the volume DKA0. The command also assigns the
user name MANAGER to the volume and displays the volume
specification after the volume is modified.
5.$ SET VOLUME/REBUILD/LOG NODE$DKA2:
%SET-I-MODIFIED, _NODE$DKA2: modified
The SET VOLUME command in this example causes a rebuild
operation to begin on the volume that is mounted on NODE$DKA2.
The /LOG qualifier directs the SET VOLUME command to display a
notification message.
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