Configuring Array Policy Modules

Dynamic Multi-Pathing (DMP) provides Array Policy Modules (APMs) for use with an array. An APM is a dynamically loadable kernel module (or plug-in) that defines array-specific procedures and commands to:

DMP supplies default procedures for these functions when an array is registered. An APM may modify some or all of the existing procedures that DMP provides, or that another version of the APM provides.

You can use the following command to display all the APMs that are configured for a system:

# vxdmpadm listapm all

The output from this command includes the file name of each module, the supported array type, the APM name, the APM version, and whether the module is currently loaded and in use.

To see detailed information for an individual module, specify the module name as the argument to the command:

# vxdmpadm listapm module_name

To add and configure an APM, use the following command:

# vxdmpadm -a cfgapm module_name [attr1=value1 \
      [attr2=value2 ...]]

The optional configuration attributes and their values are specific to the APM for an array. Consult the documentation from the array vendor for details.


By default, DMP uses the most recent APM that is available. Specify the -u option instead of the -a option if you want to force DMP to use an earlier version of the APM. The current version of an APM is replaced only if it is not in use.

Specify the -r option to remove an APM that is not currently loaded:

# vxdmpadm -r cfgapm module_name

See the vxdmpadm(1M) manual page.