Kernel-Managed Swap Facility (KMSF) Manual

Introduction
Kernel-Managed Swap Facility (KMSF) Manual—425824-005
1-9
Default Swap Files
•
Is configured with a threshold value (when the usage of the swap file reaches the
percent-full value specified by its configured THRESHOLD attribute, an EMS
operator message is generated)
For a detailed description of swap file attributes, see the ADD Command in Section 4,
NSKCOM Command Reference.
Default Swap Files
Default swap files are created by the operating system during the loading or reloading
of a processor if no configured swap files are available at the time the processor is
loaded or reloaded. Default swap files use the naming convention
$SYSTEM.ZSYSSWAP.SWAPnn, where nn is the processor number. These swap
files differ from configured swap files in the following ways:
•
When default swap files are created, 64 megabytes is allocated for a default swap
file for the system load processor; 1 megabyte is allocated for a default swap file
for each additional processor that is reloaded.
•
Default swap files automatically grow as needed, in increments of 1 megabyte, up
to the maximum default file size of:
°
512 megabytes for systems running H-series RVUs
°
256 megabytes for systems running G06.27 and later G-series RVUs.
°
128 megabytes for systems running G06.26 and earlier G-series RVUs.
•
Default swap files are not listed in the ZSYSCFG configuration file.
Table 1-1. Formats of KMS Files
Format 1 Format 2
Attribute Min Max Default Min Max Default
EXT 8 65504 512
(G-series
RVUs)
1024
(H-series
RVUs)
8 65536 512
(G-series
RVUs)
1024
(H-series
RVUs)
MAXEXTENTS 16 800 64 16 800 64
SIZE* 256 KB 2047 MB** 64 MB 256 KB 100 GB 64 MB
* SIZE=EXTENTS*MAXEXTENTS*2048 bytes
** The maximum size for Format 1 files is limited by 32-bit addressing.