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Browse Prior Art Database

Short Library Accessor Standby

IP.com Disclosure Number: IPCOM000087292D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Carnes, ML: AUTHOR [+2]

Abstract

For an automatic library having two robots or accessors for reliability, but also having small physical size which makes the simultaneous operation of both robots inefficient, the following accessor management technique is useful. During a power-up cycle or Vary On Procedure, the library size is detected by the microcode from pluggable program pins in the hardware, and after a checkout of the accessors, one accessor is powered down and pushed to a "garage area" outside of the active storage area.

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Short Library Accessor Standby

For an automatic library having two robots or accessors for reliability, but also having small physical size which makes the simultaneous operation of both robots inefficient, the following accessor management technique is useful. During a power-up cycle or Vary On Procedure, the library size is detected by the microcode from pluggable program pins in the hardware, and after a checkout of the accessors, one accessor is powered down and pushed to a "garage area" outside of the active storage area.

The controller logically places this accessor in a standby status and the accessor remains inactive unless a failure occurs on the primary or active accessor. In this event, the controller reactivates the standby accessor, using it to push the failing accessor to its garage and then continues executing the fetch and store operations. To prevent uneven accessor wear, the accessor chosen for standby status is alternated on a periodic or usage basis.

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