1–2 Model 2100 and 2200 Ultra SCSI Controller Enclosures User Guide
Figure 1–2. Model 2200 controller enclosure
Product Description
The Compaq StorageWorks array controllers process host data and distribute this data (at
the same rate) over six buses to storage enclosures. The controller enclosure is connected
to the storage enclosure with single-ended, 16-bit (wide) Ultra SCSI bus cables. Table 1–1
lists the elements (devices) this enclosure accommodates and their functions.
CXO6321D
CXO6322C
Table 1–1 Major Enclosure Elements and Their Functions
Element
Function
Array controller
A minimum of one or a maximum of two array controllers to operate the enclosure data buses.
Cache modules
A minimum of one or a maximum of two cache modules to support array controller operations.
One cache is required per array controller. Each cache requires an external cache battery (ECB).
ECB
Four ECB bays are provided, but the enclosure
supports
only two ECBs at any given time. ECBs
provide backup DC power to the cache modules in the event of a primary power failure. One ECB
is required per installed array controller and cache set.
Environmental
monitoring unit (EMU)
Monitors enclosure operations, detects and reports error conditions, and automatically initiates
some corrective actions.
Input/output (I/O)
module
Ultra SCSI single-ended I/O modules for connecting the enclosure to storage enclosures. Model
2100 enclosures support only two I/O modules; Model 2200 enclosures support six I/O modules.
Power supply
A minimum of one or a maximum of two 180 W power supplies provide DC power to enclosure
elements.
Fan
Three dual-speed fan (blower) assemblies provide cooling air to enclosure elements.