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Browse Prior Art Database

Send-Ahead Staging for Single-Gripper Picker in Optical Library

IP.com Disclosure Number: IPCOM000037163D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Hartung, JC: AUTHOR [+3]

Abstract

An optical disk library may use one or more robotically controlled pickers to load optical cartridges into optical drives and to put unloaded cartridges into storage slots. Each picker would have one or more cartridge grippers. This article describes how to improve the cartridge-load response time of an optical library which has only one cartridge gripper mechanism on its single robotic picker.

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Send-Ahead Staging for Single-Gripper Picker in Optical Library

An optical disk library may use one or more robotically controlled pickers to load optical cartridges into optical drives and to put unloaded cartridges into storage slots. Each picker would have one or more cartridge grippers. This article describes how to improve the cartridge-load response time of an optical library which has only one cartridge gripper mechanism on its single robotic picker.

An optical library with only one cartridge gripper on its single picker can have its load response time improved by leaving a small number of pairs of storage slots vacant, adjacent to the optical drives. These slots can then be used for temporary storage of cartridges, the result of which is an overall improvement of cartridge- load response time. The two situations which would show improvement are (a) when a load request comes to a library which is drive bound and (b) in a picker bound library, when assigned storage location of the cartridge being unloaded from a drive is further away from the drive than the next cartridge to be loaded.

A library is drive bound when all drives are in use. When a load request comes to a drive bound library, the single-gripper picker can move this new cartridge to a vacant slot adjacent to the optical drive it will be mounted on. Then, when the old cartridge is demounted from that drive, the single-gripper picker removes the old cartridge and temporarily stores it in the next adjacent vacant slot. Then the picker makes a short move to the new cartridge in its temporary slot, seizes it, and then loads it into the waiting drive. After the desired cartridge is loaded, this picker removes the old cartridge from its temporary storage...