SERVNSA parameter: Difference between revisions
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<var>[[SERVNSSZ parameter|SERVNSSZ]]</var> (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 <var>SERVNSSZ</var> rounded to 4 K and multiplied by <var>NUSERS</var>. | <var>[[SERVNSSZ parameter|SERVNSSZ]]</var> (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 <var>SERVNSSZ</var> rounded to 4 K and multiplied by <var>NUSERS</var>. | ||
When sizing <var>SERVNSSZ</var>, it should | When sizing <var>SERVNSSZ</var>, 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 7.4 is X'02000000'. | ||
The maximum non-swappable setting for version 7.5 is X'02806000'. | The maximum non-swappable setting for version 7.5 is X'02806000'. | ||
Revision as of 16:36, 20 November 2014
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:
| Bit | Server table placed above the bar |
|---|---|
X'02000000' | FTBL |
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.