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12 Installing the Cross-Connect Panel
TOOLS:
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Cabling for a SCSI Cluster
A SCSI cluster is a group of devices (maximum 8) connected to a SCSI bus. Each
SCSI cluster supports a SCSI file system. A DNC can contain one or more SCSI
clusters. Each SCSI cluster includes the Primary Processor SRU or a File Processor
SRU, and at least one disk storage SRU. If the disk storage SRU is not equipped
with a cartridge tape drive, then the cluster must also include a Cartridge Tape SRU
or a Nine-track Tape Unit (for loading system programs and data).
The first SCSI cluster (containing the Primary Processor SRU) can also contain a
File Processor SRU. Each additional cluster must contain one File Processor SRU,
and may contain a second. Each cluster can contain a maximum of two tape units
(tape SRUs or Nine-track Tape Units), and a maximum of four disk storage SRUs.
(For the details for your system, see the provisioning tables and cabinet layout
worksheets in the Site Records, 450-1011-152.)
Do not power up the system until all the cabling connections have been made.
If disconnecting a SCSI cable on an operating system, power down the system
first.
For connector locations and suggested SRU layout, see Fig. 8-2.
To install the cabling for a SCSI cluster, proceed as follows:
(1) Open the rear door of the cabinet to access the rear panels of the SRUs. The
(2) Locate the appropriate SCSI cable, which is typically shipped in the same
Practice 450-1011-201
Small flat-blade screwdriver
Nutdriver (3/16 inches)
Wire-wrap tool.
Mass Storage SRU should be on the lower shelf (because of its weight). The
Mass Storage SRU is to be connected to either the Primary Processor SRU or a
File Processor SRU. Locate that SRU directly over the Mass Storage SRU.
(You can check their locations from the front of the cabinet, if you wish, as each
SRU is labeled on its front panel. Also, the product code is located on a label on
the rear panel of each SRU.)
packing carton as the Storage SRU.
- CAUTION -
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