The device discovery feature of VxVM can discover some devices that are controlled by third-party drivers, such as for EMC PowerPath. For these devices it may be preferable to use the multipathing capability that is provided by the third-party drivers rather than using the Dynamic Multipathing (DMP) feature. Provided that a suitable array support library is available, DMP can co-exist with such drivers. Other foreign devices, for which a compatible ASL does not exist, can be made available to Veritas Volume Manager as simple disks by using the
addforeign command. This also has the effect of bypassing DMP.
See "How to administer the Device Discovery Layer" on page 85.