The Bypass Driver is used to provide a special class of storage controller to the CHARON-AXP/SMA.

Installation

After attaching the virtual disk, as described in Preparing to Install the Guest Utilities, use the POLYCENTER Software Installation (PCSI) utility to install the Bypass Driver. The following example demonstrates the PCSI PRODUCT INSTALL commands to execute and the expected output (the example assumes the utilities virtual disk image is attached at DKA400:).

Bypass Driver Installation

$ PRODUCT INSTALL CHARON_DISK/SOURCE=DKA400:[BYPASS]
%PCSI-I-CANNOTVAL, cannot validate DKA400:[BYPASS]SRI-AXPVMS-CHARON_DISK-V0104--1.PCSI;1
-PCSI-I-NOTSIGNED, product kit is not signed and therefore has no manifest file

The following product has been selected:
    SRI AXPVMS CHARON_DISK V1.4 Layered Product

Do you want to continue? [YES] YES

Configuration phase starting ...

You will be asked to choose options, if any, for each selected product and for any products that may be installed to satisfy software dependency requirements.

SRI AXPVMS CHARON_DISK V1.4: Charon disk driver V1.4 for OpenVMS Alpha.

    Copyright (C) 1976, 2009 Software Resources International

    CHARON_DISK was produced by Software Resources International

* This product does not have any configuration options.

Execution phase starting ...

The following product will be installed to destination:
    SRI AXPVMS CHARON_DISK V1.4 DISK$TARDISSYSTEM:[VMS$COMMON.]

Portion done: 0%...10%...20%...80%...100%

The following product has been installed:
    SRI AXPVMS CHARON_DISK V1.4 Layered Product

Configuration

To make use of the Bypass Driver it is necessary to add some options to the CHARON-AXP/SMA(+) configuration file. The following sections describe the changes to the syntax and keywords.

Controller Definition

Configuring a storage controller for use with the Bypass Driver is a simple as adding a single bypass keyword to the storage controller load command.

One of the benefits of the Bypass Driver is that it allows you to specify a storage technology other than SCSI for the controller. This can be particularly important if an existing native environment has been set up as dependant on a certain type of storage technology. The table below shows the command necessary to define a storage controller for the supported technologies. In the configuration command definition, n denotes the number of controllers to create.

Bypass Driver Storage Controllers

Control Type	Storage Technology	Configuration Commands
PG	FibreChannel	`load n PG bypass`
PI	DSSI	`load n PI bypass`
PK	SCSI	`load n PK bypass`
PQ	IDE	`load n PQ bypass`
PR	RAIDArray	`load n PR bypass`
PU	MSCP	`load n PU bypass`

Device Definition

Configuring a disk device as attached to a bypass enabled controller is no different for SCSI devices. For other storage technologies only the device class changes, all other object members mentioned in ... are applicable. The table below lists the disk device class for each storage technology.

Bypass Disk Device Classes

Device Class	Storage Technology	Example load Command
DG	FibreChannel	`load DGA500`
DI	DSSI	`load DIA0`
DK	SCSI	`load DKA400`
DQ	IDE	`load DQA0`
DR	RAIDArray	`load DRA0`
DU	MCSP	`load DUA0:`

It is not supported to connect non-disk devices (such as tape) to a storage adapter configured to use the bypass driver.