VM/Pass-Through Facility
PVM


Product Number: 5684-100 Release 2.1.1

New Function available for PVM 2.1.1

APAR VM60644 provides significant new function for the PVM server. The largest enhancement is the addition of multiple session capability for the PVM DIAL support (YVETTE like function).

  • Multiple Session Support When DIALing The PVM Server
  • New PVM Server Command
  • START GRAF PVM Server Command Enhancements

    • Multiple Session Support When DIALing The PVM Server

    The following externals support the DIAL PVM multiple session capabilities:

    • The number of 'DIAL PVM' users is limited to the number of graphic devices started
    • The number of sessions per DIAL user is limited by the MAXSESS setting (Configuration file record), defaults to 5.
    • The 'Q MPVM' command displays results for the number of DIAL sessions.
    • Three new fields have been added to the PVM selection screen which are displayed only when DIALing PVM. The fields are NICKNAME (to provide a unique name for each session, If a nickname is not provided it will default to the nodename), SESSION ROLL (string/key used to roll from one session to the next or to select a particular nickname), and MENU SELECT (string/key used to display the PVM selection screen).
    • Unused PF keys on the PVM selection screen will be filled in with nicknames.
    • Nicknames will be displayed on the PVM selection screen ahead of the nodename list.

    New PVM Server Command

    'DELETE nodeid' command has been added to the PVM server:

    DELETE causes a previously defined node to become temporarily undefined. Permanent deletion of a node can be made only by removing the LINK definition from the PVM configuration file. When entering the DELETE command, the node you are deleting must be inactive (have a status of DOWN).

    Format: 

       >>-------DELETE-------nodeid--------
    Where nodeid is the one- to eight- character name of the node to be undefined.

    Usage notes:

    1. If there are any routes to the node to be deleted, each route will be removed with a message issued indicating deletion.
    2. If the node to be deleted is part of a group and there are no other nodes in the group, the group will be removed.

    START GRAF PVM Server Command Enhancements

    Addition of the 'BUF nn' optional parameter on the 'START GRAF' command description:

    To avoid possible performance degradation when uploading files while using the 'DIAL PVM' support, use the 'BUF nn' parameter to define the minimum number of 4096-byte buffers PVM should use when issuing read operations to a users terminal.

    The following performance degradation can occur when uploading files from a workstation while using the 'DIAL PVM' support of the PVM server:

    When there is data to be read from a users terminal by the 'DIAL PVM' support, PVM will issue a read operation with a buffer size of 4096 bytes. If a overflow would occur (such as when uploading data from a PC), PVM will have to reissue the read operation with the corrected data byte count. When uploading data from a PC, this will cause 2 reads to be issued for every data packet the PC sends.

    Format: 

    >>-------START-----GRAF----vaddr-------------------------
                                 |               |
                                 |               |
                                 ------BUF nn-----
    Where nn is the number, from 1-15, of extra 4096-byte buffers the 'DIAL PVM' support should obtain prior to issuing read commands to a users terminal.