User`s guide

• The six SCSI–2 port cables from the controller shelf can be routed to
more than one device shelf as desired, taking into consideration prescribed
configuration rules and restrictions as listed in Chapter 3.
The HSZ array controller consists of a single module that is configured alone
(nonredundant) or with a second like controller for dual-redundant availability in
the controller shelf. One read cache or write-back cache module is supported for
each controller module.
The HSZ array controller is supported in a single host environment, where the
host can have a 8-bit single-ended adapter or a 16-bit differential adapter. The
HSZ40 array controller host port is a 16-bit fast-wide-differential (FWD) SCSI–2
interface, which requires a DWZZA host adapter for those hosts that have 8-bit
single-ended adapters. (See Chapter 3 for supported host adapters.)
Note
Either a desktop (DWZZA–AA) or SBB (DWZZA–VA) DWZZA host
adapter can be used for hosts that require an 8-bit single-ended adapter.
Refer to the StorageWorks Solution Shelf and SBB User’s Guide for more
information about DWZZA-series SCSI–2 bus signal converters.
The HSZ array controller requires a SCSI–2 trilink connector block (Digital
part number 12–39921–01 or H885–AA) mounted on its host connector
(which is included with each controller), and requires external terminators
(H879–AA, 68-pin) as appropriate. See Section 4.6.2.3 for host port cable
installation instructions.
The combination of HSZ array controllers in a controller shelf, storage shelves
with their power supplies, assorted SCSI–2 device and SCSI–2 host cables, and
cable distribution units, compose the HSZ40 array controller subsystem. HSZ
array controller subsystems are available in SW800-series data center cabinets,
SW500-series cabinets, or SW300-series deskside enclosures.
HSZ40–A x and HSZ40–B x
There are two HSZ40 array controller module versions, the original
HSZ40–Ax and the later HSZ40–Bx. The HSZ40–Bx array controller
supports an environmental monitor unit (EMU) in an SW300-series
deskside RAID enclosure cabinet and has a center-keyed modified
modular jack (MMJ) maintenance terminal port connector.
1.4 Controller Host Interface Protocols
The CI (HSJ) and DSSI (HSD30) interfaces use MSCP and TMSCP as the storage
control protocols through which access to the controller-attached SCSI–2 devices
is obtained.
The SCSI FWD (HSZ) host interface uses the SCSI–2 protocol for a host to access
LUNs attached to the controller (the controller being a SCSI target as seen by
the host).
Introduction to HS Array Controllers 1–7