DMP allows you to turn off I/O for a controller or the array port of a storage processor so that you can perform administrative operations. This feature can be used for maintenance of HBA controllers on the host, or array ports that are attached to disk arrays supported by VxVM. I/O operations to the controller or array port can be turned back on after the maintenance task is completed. You can accomplish these operations using the vxdmpadm command provided with VxVM.
For Active/Active type disk arrays, after disabling the I/O through an HBA controller or array port, the I/O continues on the remaining paths. For Active/Passive type disk arrays, if disabling I/O through an HBA controller or array port resulted in all primary paths being disabled, DMP will failover to active secondary paths and I/O will continue on them.