HP StorageWorks 500 G2 Modular Smart Array - Manual (Page 40)

40 HP StorageWorks MSA500 G2 Storage System User Guide
CAUTION: Always plan the rack installation so that the
heaviest item is on the bottom of the rack. Install the heaviest item first,
and continue to populate the rack from the bottom to the top.
NOTE: Rack components are removed for clarity.
2. Secure the front end of the rails to the rack.
IMPORTANT: Do not remove the pins from the ends of the rack rails
unless you are converting the rails for use in round-hole racks. These
load-bearing pins are designed to fit through the holes without being
removed.
IMPORTANT: Be sure that the scissor-type locking latches engage the
rack fully when the pins extend through the holes marked with the
template.