HP MSA 30 User Manual page 21

a. Align the lower edge of the template with the bottom of the rack (or the top
of the previous rack component) and push the tabs in to hold the template in
place. Be sure that the template is horizontal.
b. Mark the required location of the rails on the rack.
c. Repeat this procedure to mark the back of the rack, using the back of the
template.
2. Identify the left (L) and right (R) rack rails by markings stamped on the sheet
metal.
HP StorageWorks Modular Smart Array 30 User Guide
WARNING: Unless you are converting the rails for use in round-hole racks,
do not remove the load-bearing pins from the ends of the rack rails.
Installing the System in a Rack
2-3