User`s guide

• Digital Storage System Interconnect (DSSI) for HSD30 Array

Controllers

System Communication Services (SCS)

Mass Storage Control Protocol (MSCP)

Tape Mass Storage Control Protocol (TMSCP)

Diagnostic Utility Protocol (DUP)

• Small Computer System Interface (SCSI) for HSZ Array Controllers

SCSI–2 protocol with tagged command queuing and vendor-unique

diagnostic pages (for communication with the controller CLI).

2.2.3 Operator Interface and Subsystem Management Functions

The operator interface and subsystem management functions support the user

interface, subsystem management, subsystem veriﬁcation, and error logging fault

management. These functions are described in the following sections.

2.2.3.1 Command Line Interpreter

The controller’s command line interpreter is the primary user interface for the

controller. The CLI contains ﬁrmware for controlling most management functions

plus local program execution.

2.2.3.2 Diagnostic Utility Protocol

The DUP connection between the controller and the host is supported over the

CI bus for HSJ array controllers and the DSSI bus for HSD30 array controllers.

DUP allows you to access the CLI and local programs through a remote host

‘‘virtual’’ terminal in much the same way as using a maintenance terminal.

2.2.3.3 HSZ Array Controller Virtual Terminal Connection

For HSZ array controllers, a virtual terminal port connection can be created using

a host-based application called the HSZterm utility. This application uses SCSI

diagnostic send/receive commands to deliver and receive characters to/from the

HSZ array controller CLI and local programs.

2.2.3.4 Local Programs

The following are local programs available for controller subsystem management

and veriﬁcation:

• DILX and TILX internal disk and tape exercisers for SCSI–2 disk and tape

drives

• VTDPY user display for current controller state and performance data

• C_SWAP for controller and cache module warm swap (for dual-redundant

conﬁgurations)

• FLS for enabling and disabling licensed features

• CFMENU for conﬁguring storage devices, storagesets, and units

• Code Patch for ﬁrmware changes and repairs

• Code Load for writing new ﬁrmware onto the PCMCIA card for HSZ40–Bx

array controllers

• FMU for displaying controller last failure information and controlling the

display of spontaneous events

• CONFIG for adding new devices that are not currently in the conﬁguration

2–14 Controller Technical Description