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Changing the virtual lookaside facility (VLF) parameters

Use the MODIFY VLF,REPLACE,NN command to cause the virtual lookaside facility (VLF) to use the specified COFVLFxx member of the logical parmlib. See z/OS MVS Initialization and Tuning Reference for more information about the use of the COFVLFxx member.
 
F VLF,REPLACE,NN=xx
 

The parameters are:

VLF
The name of the job.
REPLACE,NN=xx
Causes VLF to replace the current configuration with a new configuration. The xx value can be a single COFVLFxx member of the logical parmlib, or a concatenated list of up to 16 COFVLFxx parmlib members, enclosed within parentheses and separated by commas.
Example: The following command replaces the current VLF configuration with a new configuration from a concatenation of parmlib members COFVLFAA, COFVLFBB, and COFVLFCC:
MODIFY VLF,REPLACE,NN=(AA,BB,CC)
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