Kernel-Managed Swap Facility (KMSF) Manual

Kernel-Managed Swap Facility (KMSF) Manual—425824-005
2-1
2 Configuring KMSF
The KMSF configuration file, ZSYSCFG, is automatically created by NSKCOM. Use
NSKCOM, the HP NonStop operating system command interface to KMSF, to create
swap files and alter your configuration.
There are two kinds of KMSF swap files:
•
Default swap files
•
Configured swap files
This section describes configured swap files. For information about default swap files,
see Default Swap Files on page 1-9. For information about NSKCOM and its
commands, see Section 4, NSKCOM Command Reference.
When to Configure KMSF
Create and add configured swap files as soon as possible after a new system is
loaded. The default swap files created when a system is started for the first time are
not adequate for normal system operations, but are sufficient for you to start NSKCOM
to add and start additional KMS files.
Guidelines for Configuring KMS Files
How you decide to configure KMSF depends on your particular system configuration
and usage. KMSF manages many of the things that were once managed using
conventional swap files. This additional load on KMS files results in larger files whose
configuration must be carefully planned and monitored.
Avoiding Processor Halts
If a disk that contains a swap file in use for a processor goes down, processes
terminate abnormally and the processor halts with processor halt code %005113. To
reduce the risk of encountering processor halts:
•
Use mirrored disk volumes for all configured swap files.
•
Configure fewer, larger swap files instead of configuring multiple swap files on
multiple disks.
•
When configuring multiple swap files, put the swap files for each processor on as
few disks as possible.
•
Consider increasing the physical memory for the processor: KMSF swap files are
used only if the physical processor memory is inadequate.