HP StorageWorks 3000 RAID Array - Manual (Page 64)

3-2 RAID Array 3000 Controller Shelf Hardware User’s Guide
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Controller Shelf Hardware User’s Guide Comments:
Part Number: EK-SMCPQ-UG. D01 File Name: d-ch3 Installation and Maintenance.doc Last Saved On: 12/4/00 1:08 PM
Use the following guidelines when installing the controller and device
expansion shelves. They apply to both RETMA and metric cabinet designs.
■ For stability and safety, arrange the components in the cabinet using a
bottom-up approach.
■ Cable length is critical when locating the shelves in the cabinet. Keep
shelves grouped together to minimize cable length problems.
■ Install the UPS below the shelves and as low as possible in the cabinet
■ Allow approximately two inches (5.08 cm) gap between the bottom of
the controller shelf and the UPS to allow cable routing between the front
panel connectors and connectors at the back of the units.
Installing Shelves in the Cabinet
Determining the best location to install the controller and device expansion
shelves in the cabinet depends on the number of expansion shelves in your
subsystem configuration. The shelves should be grouped as shown in
Figures 3-1 through 3-4. Figure 3-1 shows a single device expansion shelf
installation. Figures 3-2, 3-3, and 3-4 show a two-three-and four-shelf
installation, respectively.
Install the UPS at the bottom of the cabinet with the subsystem shelves
directly above. The host system (not shown) can reside between the UPS and
the subsystem shelf group.
Note that the controller shelf in each figure is located directly below the first
device Expansion Shelf. This minimizes the distance between the connectors
to enable the 0.5-meter SCSI cable connections between the modules in the
controller shelf and each device expansion shelf.
NOTE: The distance between shelves should not exceed one 1.5 in. (3.8 cm)
■ Because of power cord lengths, the distance between the last device expansion
shelf at the top of a shelf group and the UPS should not exceed 45 in (114 cm).