Browse Prior Art Database

Single Drive Initiated, Multi-Drive Library Interface Diagnostic Test

IP.com Disclosure Number: IPCOM000032074D
Original Publication Date: 2004-Oct-22
Included in the Prior Art Database: 2004-Oct-22
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Abstract

Testing the tape library interface for all the tape drives in a single tape drive frame by executing a diagnostic test from any one of the drives within the frame.

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THIS COPY WAS MADE FROM AN INTERNAL IBM DOCUMENT AND NOT FROM THE PUBLISHED BOOK

TUC820040403 John C Kennel/Tucson/IBM Kevin Kartchner, Paul Greco

Single Drive Initiated, Multi-Drive Library Interface Diagnostic Test

Disclosed is a system that tests the tape library interface for all the tape drives in a single tape drive frame by executing a diagnostic test from any one of the drives within the frame. The current solutions require the tape drives in a frame to either be tested individually or be attached to the tape library controller to test all the drives within a frame. Drawbacks to the current solutions include substantial extra test time to test each drive individually (for example a frame that contains 12 drives), and additional or unavailable (for example testing prior to installation at a customer's production site) library controllers to be present.

The tape drive frame contains multiple tape drives that are attached to a tape library system. See the figure below. During customer operation the tape library mechanism inserts and removes tape cartridges from the tape drives. Each tape drive is connected, in a bussed architecture via the library interface cable, to the tape library controller. The library controller communicates status and other information with the tape drives during mount and dismount operations. In order to differentiate tape drives on the bussed interface, each tape drive has a unique interface address (0,1..N) that corresponds to it's physical position within the tape drive frame. There are actually two unidirectional electrical interfaces for eac...