Virtual TapeServer 6.03.42 Operations and Administration Guide

Modifying Virtual Tape Drives

You may need to modify one or more virtual tape drives, particularly those that were

preconfigured on VTS. You may need to rename virtual tape drives according to your chosen

naming convention. This section describes how to modify virtual tape drive properties.

When adding or modifying a virtual tape drive in VTS, you must define its properties. The

following table describes the properties and specifies whether each property is presented to

the host server host when the virtual tape responds to a host’s query:

The first four properties are collectively referred to as the BTLI of the virtual tape drive. The

BTLI enables the host server to precisely identify the virtual tape connection; it provides an

exact address of the virtual tape’s location on the bus. Remember that the host is connected to

VTS by a single cable. The BTLI thereby enables you to multiplex the cable (for hosts

Property Description

Presented

to Host?

Bus ID The ID of the bus on the VTS server to which the host is

connected. This ID is not presented directly to the host. If

the connection is over Fibre Channel, the bus ID is

associated with a port WWN that is used by the host to

identify the VTS server. If the connection is over SCSI, the

bus ID on the VTS server has no special significance to the

host.

Indirectly

Target ID The SCSI ID on which the virtual tape device responds.

This ID is meaningless to the host if the connection is over

Fibre Channel.

Yes

Logical unit

number (LUN)

The sub-ID on the bus. This ID is used by the host for SCSI

and Fibre Channel connections.

Yes

Initiator ID The SCSI ID of the host. This ID is meaningless to the host

if the connection is over Fibre Channel.

Yes

Name A user-friendly name for the virtual tape device Yes

Media type The type of tape drive that the virtual tape device emulates Yes

Host type The type of host (NonStop S-series server, NonStop

Integrity server, or UNIX server)

Serial number The serial number or other string describing the virtual

tape device

Yes