Hello Jeeson,   Gatekeeper devices are Symmetrix devices that act as the target of command requests to Enginuity based functionality. These commands arrive in the form of disk I/O requests (and so a "disk" must be named by the host as the "address" or target of that command). The more commands that are issued from the host, and the more complex the actions required by those commands are, the more gatekeepers and/or array processor resources that are required to handle those requests in a timely manner.  You can find all the information relevant to Gatekeeper devices from the article emc255976.
In dmx what is the use of get keeper luns ?? its size is constant ?? what data it contain ??
use of getkeeper luns ??