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Chapter 8 691
Command Definitions SP-Z
VSCLOSE
For each mirrored pair, the system assigns a backup volume and user
volume. An attempt is made to place the backup volumes and user
volumes on separate hardware channels. The volume with the greatest
path number is selected as the backup volume.
If SPLIT is specified for a nonmirrored volume set, an error is returned
and the volume set is not closed.
Operation Notes
This command notifies the system to close the volume set and take it offline. This is done
when all users have ceased using files on the volume set, and when any program file that
has been allocated on the volume set has been deallocated (via the DEALLOCATE
command). Once the VSCLOSE command is issued for a volume set, individual users can no
longer issue VSRESERVE or MOUNT commands for the volume set.
Specifying the NOW parameter permits the operator to take the volume set offline
immediately, unless a VSRESERVESYS or an LMOUNT command has been issued, or unless a
program file has been allocated on the volume set.
This command restricts access to the volume set. Jobs or sessions are granted access to the
volume set only if they have at least one open file on the volume set or if they have already
issued an explicit VSRESERVE or a MOUNT command for the volume set.
The MPE/iX naming convention for volume sets differs from that of MPE V/E for private
volumes.
In MPE V/E, the name A.B.C indicates that B is the name of a group and that C is the
name of an account. MPE/iX accepts that name, but no interpretation is made as to the
referencing of B and C. Instead, MPE/iX treats A.B.C as a single, long string name. It is
the flexibility of the MPE/iX naming convention that makes it possible for MPE/iX to work
with a volume set designated A.B.C.
MPE/iX volume set names may consist of any combination of alphanumeric characters,
including the underbar (_) and the period (.). The name must begin with an alphabetic
character and must consist of no more than 32 characters.
A volume set called MY_OWN_PERSONAL_VOLUME_SET is acceptable in MPE/iX, and so is
MY.OWN.PERSONAL.VOLUME.SET; similarly, A.B.C is acceptable. If a volume set is named
according to the MPE V/E naming convention (A.B.C), you must use an unambiguous
reference when using the MPE/iX volume set commands, such as:
Vcommand A.B.C
Entering Vcommand A fails to access the volume set. You cannot specify the first part of
the volume set name alone and expect the group and account to default.
Use
This command may be issued from a session, job, program, or in BREAK. Pressing Break
has no effect on this command. This command may be issued only from the system console
unless distributed to other users with the ALLOW command.