SNAX/XF LU Network Services Manual

Specifying the SET Table
Using LUNS
097841 Tandem Computers Incorporated 2–17
Specifying the
SET Table
The SET table identifies all ESS tables to LUNS by defining their table names and
specifying the source files in which they can be found. In any one Tandem system
(node) employing LUNS, there can be only one active SET table.
There are two ways of specifying to LUNS the SET table that you wish to be active:
1. Through the system generation SETTABNAME configuration modifier
2. Through the SETTAB parameter of the SCF ALTER SUBSYS $SSCP command
To specify an active SET table before the SNAX/XF service manager has been started
with SCF, you use the SYSGEN configuration modifier SETTABNAME. Within
SETTABNAME, you must explicitly specify the rightmost ( filename ) portion of the
SET table source-file name. SETTABNAME has no default value and cannot exceed a
length of seven characters. The SET table must reside on the volume and subvolume
from which SNAX/XF was loaded (for example, $SYSTEM.SYS01). It is on this
volume and subvolume that LUNS looks for the currently active SET table, and it is
from this volume and subvolume that LUNS derives the volume and subvolume
portions of the SET table's fully qualified file name.
If you specify SETTABNAME during system generation, and for some reason the
service manager cannot access the SET table, a LUNS error message will be displayed
on the system console and logged to the system-error log. Note that SNAX/XF will
continue execution, but LUNS will not have been initialized and therefore will not be
active. You can rectify this situation by specifying the correct SET table name through
the SCF ALTER SUBSYS command:
ALTER SUBSYS $SSCP,SETTAB $SYSTEM.SNAX.SET1
To replace one SET table with another dynamically, specify the fully qualified name of
the new SET table source file in the SETTAB parameter of the SCF ALTER SUBSYS
$SSCP command:
ALTER SUBSYS $SSCP,SETTAB $SYSTEM.SNAX.NEWSET
You can issue the ALTER command at any time after you start the service manager.
Active sessions are not affected by this command and thus sessions need not be
deactivated before you issue the command.
Note also that when you specify the SET table through the SCF ALTER command, the
table source file need not reside on any particular volume or subvolume.