MOUNT

Operation Notes

The MOUNT command reserves a specific volume set for use. It notifies the system that the volume set is to remain online and is not to be taken offline by a VSCLOSE command.

Volume sets in MPE/iX are not tied to groups and accounts. This is different from the MPE V/E scheme of disk partitioning.

The MPE/iX naming convention for volume sets differs from the MPE V/E naming convention for private volumes. 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 consist of no more than 32 characters.

Table 5-5 “Command Acceptance of Naming Conventions - MOUNT Command” illustrates the differences between the MPE/iX and MPE V/E naming conventions for volume sets.

In MPE V/E, the name V.G.A indicates that V is the name of a volume set, that G is the name of a group, and that A is the name of an account.

MPE/iX accepts that name in that form, but no interpretation is made as to the referencing of G and A. Instead, MPE/iX treats V.G.A as a single, long string name, just as it would treat A_VERY_LONG_NAME-FOR_SOMETHING.

As a convenience to established Hewlett-Packard users, MPE/iX accepts the naming convention that was used for MPE V/E private volumes. Thus MOUNT V.G.A succeeds and MOUNT V accesses the same volume set, provided you are logged on to account A, group G. The MPE V/E commands are able to default the logon account and group.

However, VSRESERVE V succeeds only if there is a volume set V in existence. The MPE/iX commands do not call up any default specifications for group and account. VSRESERVE V.G.A succeeds only if a volumeset V.G.A is online. With all MPE/iX VSxxxxxx commands, the .G.A component of this name is interpreted as a string, neither more nor less specific than _G_A.

If a volume set is named according to the MPE V/E naming convention (V.G.A), you must use an unambiguous reference when using the MPE/iX volume set commands.

Various user commands that give you access to your logon group's home volume set implicitly initiate reservation requests if the volume set is not reserved already. An example of one of these commands (BUILD) is:

 BUILD VFILE;DISC=500,10,1;REC=-80;DEV=VCLASS1

To issue a reserve request programmatically, you may issue an FOPEN call referencing a file residing on an unreserved volume set; this causes an implicit user initiated reserve request. An FOPEN reserve remains in effect until a corresponding FCLOSE intrinsic call is issued. The programmatic request is used when a single job/session step requires a certain volume set. Refer to the MPE/iX Intrinsics Reference Manual (32650-90028) for a description of a programmatic reserve request.

It is recommended that you not use the MPE V/E naming convention and xxxMOUNT commands. Instead use the MPE/iX naming convention and VSxxxxxx commands. Alternating between MPE V/E and MPE/iX commands may lead to errors. For example, MOUNT X used in a job stream attempts to access a volume set named X.logongrp.logonacct, which may or may not be your intention.

Use

This command may be issued from a session, job, program, or in BREAK. Pressing Break has no effect on this command. Use volumes (UV) or create volumes (CV) capability is required to use this command.

Examples

You are logged on to account MYACCT in group GRP. To request the system operator to reserve volume set MYSET in that group and account, with a generation index of 43, enter:

 MOUNT MYSET;GEN=43

If you are logged on in another group.account, enter:

 MOUNT MYSET.GRP.MYACCT;GEN=43