How to enable dmp cache

Description

vxdmpadm settune command enables multiple tunable options

One tunable is to enable dmp_cache_open.

# vxdmpadm settune dmp_cache_open=on

This tunable if set to on, the first open of a device that is performed by an array support library (ASL)
is cached.

This caching enhances the performance of device discovery by minimizing the overhead that is caused by subsequent opens by ASLs. If this parameter
is set to off, caching is not performed.
The default value is on.

If vxdisk list command is taking long time to provide output check this option if its set to on

To check current status (note this shows both the default and current values)

# vxdmpadm gettune dmp_cache_open
            Tunable               Current Value  Default Value
------------------------------    -------------  -------------
dmp_cache_open                           on               on.

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