Difference between symmpd & symmld

Basically, the symld command manipulates devices in device groups only. The sympd command basically lists devices by their physical host name.

From the Solutions Enabler Symmetrix CLI Command Reference (located at CS Support > Documentation/White Paper Library > Software S > Solutions Enabler > General Reference on powerlink.emc.com

"The symld command performs operations specific to a device in a device group: adds a device to a device group, adds all available devices to a device group, lists all devices in a device group, removes/moves a device or all devices from a device group, renames a device in a device group, and shows detailed information about a device in a device group."

"The sympd command performs operations on a device given the device¿s physical name, such as /dev/rdsk/c3t0d3s2, listing devices by Symmetrix ID and showing device-specific information.

The export command stores the current list of physical device names that the host can see, as well as other information about the physical device, such as the Symmetrix ID, device number, and director/port to a file.

The verify command compares the current list of physical device names to the ones stored in the file previously for any differences."