HP StorageWorks 2300 Disk System - Manual (Page 68)

68 Installation
8. Repeat the procedure above for the other rail.
9. Insert the disk system (with disk modules and power supplies
removed) onto the rails.
10. Move the disk system retention brackets to the frontmost set of
mounting holes.
This allows the disk system to install further back into the cabinet; and
so, allows the cabinet doors (if present) to close properly.