HP Surestore Disk Array 12h - And FC60 Service Manual page 240

Appendix D. Back-to-Back Racking
Installation
3. Add rail kits
The upgrade requires enough rail kits (part C2788A) to accommodate the number of disk storage
enclosures to be racked.
A 2.0 meter rack requires three rail kits, and a 1.6 meter rack requires two rail kits.
If the rack is completely filled with front-racked disk storage enclosures, then no additional rail kits are
required.
4. Add power cables and SCSI cables
The upgrade requires ordering enough power and SCSI cables to serve all installed disk enclosures.
Standard HP power cables (8120-6514) will meet all power cable requirements.
Standard HP SCSI cables will meet all SCSI cable requirements.
5. Back-to-Back Array Density
Depending on whether service accessibility is available through the side of the rack or not, determines
the number of disk arrays that can be installed. Side access requires that the facility housing the racks
allow HP service personnel sufficient room at either side of the rack. This space should be
approximately 2 feet. This clearance will allow HP service personal to remove the side panel of the
rack and gain access to the components inside. If side access is not possible, then the capacity of back-
to-back racking is reduced. Refer to
240
Figure 49.