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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.
English (United States)
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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...