SNAX/XF LU Network Services Manual
LUNS Configuration Tables
Introduction to LUNS
097841 Tandem Computers Incorporated 1–9
The SET Table Just as LUNS must be aware of processes, it must know of all ESS and BIND tables.
The SET table defines each of these tables to LUNS by assigning a unique table name.
The table name appears in the record-name field of one of the SET table’s records.
Such a record serves to relate that table name to a file where LUNS can find the
relevant table data. For ESS tables, the record can also indicate that a particular table is
the default table for the entire system.
Figure 1-4 shows the contents of a SET table record for an ESS table.
Figure 1-4. Record for an ESS Table in the SET Table
003
ESS1, $SYSTEM.SNAX.ESSTAB1, DEFAULTTABLE
Y
Record for an ESS table. This record relates the table name ESS1 to the
file name $SYSTEM.SNAX.ESSTAB1. The table has been flagged as
the default table.
On any Tandem system (node), there can be only one active SET table, which is itself
defined to LUNS either by means of the service manager SETTABLENAME modifier
in the peripherals paragraph (specified in the SYSGEN phase of INSTALL) or through
the SETTABLENAME attribute of the SCF ALTER SUBSYS command.
How LUNS Uses
Configuration Tables
When a terminal user enters a character-coded command or an intelligent device sends
an INIT-SELF request, LUNS searches that terminal’s ESS table for a corresponding
record-name field. Upon finding such a name and its associated record, LUNS scans
that record’s other fields for information needed to set up the LU-LU session.
If a passthrough session is specified, LUNS sends the logon—either a character-coded
command or INIT-SELF—directly to the host. If a static passthrough path is specified,
LUNS establishes a host SSCP-LU session for the terminal.
When the logon record does not specify a passthrough session, LUNS searches it for
information needed to set up a session with an application on the Tandem system.
Figure 1-5 shows how LUNS uses an ESS table to process a logon request for the TACL
process, whose character-coded logon is TACL.