HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 235
Appendix D. Back-to-Back Racking, Product Description
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Appendix D. Back-to-Back Racking This appendix explains how to install disk arrays back-to-back in either a 1.6-meter rack (C2786A) or a 2.0 meter rack (C2787A). The following information is included: • Product description • Installation • Troubleshooting • Removal and replacement • Specifications Product Description Customers may obtain maximum disk storage capacity with a minimum use of floor space by filling their Hewlett-Packard computer/instrument racks completely with the maximum number of array enclosures. This solution is known as back-to-back racking, because both front and back areas of the rack are used, and the disk arrays are oriented "back-to-back" in the rack. Back-to-Back installation of disk arrays requires several modifications be made to the rack prior to installing the additional arrays. These modifications include: Installation of power upgrade kit, three 19" PDU assemblies (replacing the existing 56" PDUs), Installing a high volume exhaust fan assembly, and Removing the rear rack door and hardware Field upgrade kits are available for the above modifications and need to be available prior to beginning the installation (see Table 19. Upgrade Kits and Components). Prior to modifying the rack for back-to-back installation you need to determine if the maximum number of disk arrays can be installed. Six disk arrays completely fill a 2.0-meter rack and four disk arrays fill a 1.6 meter rack, known as high-density configuration. Depending on the service access method, the maximum number of arrays that can be installed varies. If the rack is located to allow a side panel to be removed for service access (for example, if the rack is located at the end of a row or can be rolled out) then the rack can be filled completely (high density). If the rack is situated such that side access is not possible then one position (one disk enclosure space) must remain open to allow for service access (see Figure 49). NOTE The 1.6 meter rack (C2786A) has a total height of 32 EIA units and the 2-meter rack (C2787A) has a total height of 41 EIA units. (One EIA unit is equal to 1.75 inches or 44.45 mm.) The disk array enclosure has a height of 13 EIA units. 235 Racking