SERVNSA parameter

From m204wiki
Jump to navigation Jump to search

Non swappable server areas

Summary

Default value
0
Parameter type
System
Where set
On User 0's parameter line
Related products
All
Introduced
Model 204 V7.4

Description

The SERVNSA parameter, along with the SERVNSSZ parameter, control non-swappable server areas that are placed above the 2G bar.

Each server table to be allocated above the bar is controlled by a bit in SERVNSA; if the bit is on, the corresponding server table is allocated above the bar.

The bits are:

BitServer table placed above the barRequired version of Model 204
X'10000000'RTBL7.6 or later
X'08000000'KTBL7.6 or later
X'02000000'FTBL7.4 or later
X'01000000'XTBL7.6 or later
X'00800000'GTBL7.5 or later
X'00400000'ITBL7.6 or later
X'00100000'FSCB7.6 or later
X'00080000'STBL7.6 or later
X'00040000'VTBL7.6 or later
X'00020000'TTBL7.6 or later
X'00010000'HTBFRS7.6 or later
X'00004000'NTBL7.5 or later
X'00002000'QTBL7.5 or later

SERVNSSZ (server non-swappable size) is the amount of space in bytes required for the above-the-bar server tables per user. The total amount of storage allocated for non-swappable server areas equals SERVNSSZ rounded to 4 K and multiplied by NUSERS. When sizing SERVNSSZ, it should accommodate the largest non-swappable table sizes that might be needed. The maximum non-swappable setting for version 7.4 is X'02000000'. The maximum non-swappable setting for version 7.5 is X'02806000'. The maximum non-swappable setting for version 7.6 is X'1BDF6000'.

In Model 204 7.5 and later, QTBL and NTBL can alternatively be placed above-the-bar in a swappable area. This can be indicated with the SERVGA and SERVGSZ parameters.

Note: The same bits should not be set in both SERVNSA and SERVGA – if they are, an error message will be issued and the online will fail to come up.

For more information about server tables above the bar, see Server tables.