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the label at the front of a disk drive module. The service aids show the number as the last
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eight digits of the IEEE 16-digit SSA unique identifier (UID).
Service actions are always related to physical disk drives. For this reason, errors that
occur on SSA disk drives are always logged against the physical disk drive (pdisk).
If a disk drive that has been formatted on a machine of a particular type (for example, a
Personal System/2) is later installed into a using system that is of a different type (for
example, an RS/6000), that disk drive is configured only as a pdisk during the
configuration of the using system.
SSA Signal Cards (Models 010 and 500)
The four signal cards that are at the back of the 7133 Models 010 and 500 provide the
connections between the external SSA cables and the disk drive module strings. Each
signal card has two external SSA connectors. Through these connectors, the signal cards
and, therefore, the disk drive module strings, can be connected to each other or to the
using system.
Chapter 1. Reference Information
1-37
Summary of Contents for 7133 Series
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