
1–2 HSG80 User’s Guide
The HSG80 Array Controller Subsystem
Take a few moments to familiarize yourself with the major components
of the HSG80 Array Controller subsystem. Figure 1–1 shows the
components of a typical installation which includes:
One BA370 rack-mountable pedestal enclosure.
Two controllers, each supported by their own cache module.
Two external cache batteries (ECBs) in one Storage Building Block
(SBB), which provide backup power to the cache modules during a
primary power failure.
One environmental monitoring unit (EMU) that monitors the
subsystem’s environment, and alerts the controller of equipment
failures that could cause an abnormal environment.
One power verification and addressing (PVA) module that provides
a unique address to each enclosure in an extended subsystem.
Six I/O modules that integrate the SSB shelf with either an 8-bit
single-ended, 16-bit single-ended, or 16-bit differential SCSI bus.
Two cache modules, which support nonvolatile memory and
dynamic cache policies to protect the availability of its unwritten
(write-back) data.
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