HP Array Controller HSG V8.7 Software - Manual (Page 152)

Storage Devices
7–6 UltraSCSI RAID Enclosure
Guidelines for Replacing a Disk Drive SBB
This section describes the SBB connector and items to consider when
replacing a disk drive SBB.
The SBB Connector
The StorageWorks SBB connectors ensure that the disk drive SBBs
operate reliably, even when replaced many times.
The disk drive SBB has a 96-pin receptacle DIN connector that
provides positive mating with the SBB enclosure plug connectors.
This connector is designed to ensure that dc power is present:
1. Before the SCSI bus connection is made.
2. After the SCSI bus connection is broken.
This feature protects the integrity of the SCSI data bus and avoids
introducing noise on the bus that could either distort data or cause the
bus to “hang.”
The SBB connector is a simple, highly reliable mechanism that
supports 200 SBB replacement cycles. A replacement cycle consists
of removing and replacing an SBB. Over the active product life of 5
years, this is the equivalent of 40 replacement cycles per year, or
approximately 1 cycle every 9 days. The replacement cycle limit
applies equally to enclosure connectors and device connectors.
Replacing an SBB more often than the recommended cycle causes the
gold contact coating to wear away and destroy the integrity of the
connection. This product does not support environments that require a
greater number of replacement cycles, because this is considered
improper treatment or use (paragraph 9.4b of U.S. Standard Terms
and Conditions). Products or connectors damaged due to a higher
number of replacement cycles are not eligible for return under
warranty or standard service plans. Compaq markets a specific family
of removable storage elements for higher replacement cycle
environments. Contact your Compaq Account Representative for
more information.