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).
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.
'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:
- If there are any routes to the node to be deleted, each
route will be removed with a message issued indicating
deletion.
- 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.
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-------------------------
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------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.
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