SERVNSA parameter

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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 bar
X'02000000'FTBL — requires version 7.4 or later of Model 204.
X'00800000'GTBL — requires version 7.5 or later of Model 204.
X'00004000'NTBL — requires version 7.5 or later of Model 204.
X'00002000'QTBL — requires version 7.5 or later of Model 204.
X'01000000'XTBL — requires version 7.6 or later of Model 204.
X'10000000'RTBL — requires version 7.6 or later of Model 204.
X'08000000'KTBL — requires version 7.6 or later of Model 204.
X'00400000'ITBL — requires version 7.6 or later of Model 204.
X'00100000'FSCB — requires version 7.6 or later of Model 204.
X'00080000'STBL — requires version 7.6 or later of Model 204.
X'00040000'VTBL — requires version 7.6 or later of Model 204.
X'00020000'TTBL — requires version 7.6 or later of Model 204.
X'00010000'HTBFRS — requires version 7.6 or later of Model 204.

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. The bits corresponding to NTBL and QTBL 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.