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DEFRAGMENT, SET
*Conan The Librarian
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The SET subcommand defines or changes the value of the
defragmentation process limits.
Format
DEFRAGMENT SET { (parameter=value[,...]) } [ /QUALIFIERS ]
keywords:
o CPU_LIMIT specifies the percent of CPU usage for any one
defragmentation process. The CPU percent is the percent of
a single CPU.
o IO_LIMIT specifies the maximum direct I/O rate (per second) of
any one defragmentation process.
o PROCESS_LIMIT specifies the maximum number of defragmentation
processes per node.
o None.
3.1 - /NODE
/NODE=(node-name[,...])
/NONODE (default)
The /NODE qualifier limits the scope of the SET
subcommand. By default, a given parameter is set
identically on all nodes in the scheduling database.
To limit parameters to fewer nodes, specify the node
names with the /NODE qualifier.
The following examples show how to set limits using the SET
subcommand and its qualifiers:
1.$ DEFRAGMENT SET PROCESS_LIMIT=3, IO_LIMIT=14/NODE=NODE_1
In this example, the maximum number of defragmentation
processes that can occur on NODE_1 is 3. Further, a restriction
of 14 direct I/Os per second is placed on each of these 3
defragmentation processes.
2.$ DEFRAGMENT SET CPU_LIMIT=50
In this example, the maximum CPU resources allocated to any
defragmentation process is set to 50 percent on all nodes in
the system. If a defragmentation process exceeds this limit,
its priority is decremented each minute (approximately) until
it reaches the SYSGEN parameter, DEFPRI, minus 1.