Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Library Cartridge Packing via a Multiple Gripper Picker

IP.com Disclosure Number: IPCOM000108949D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Power, RR: AUTHOR [+3]

Abstract

Internal optical, tape, or diskette devices in library boxes are serviced by robotic picker mechanisms. Operations currently done by these pickers include removing old mount requests from the internal devices, putting those old mount requests in the cartridge storage area, retrieving the new mount requests, and inserting the new mount requests in the target devices.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Library Cartridge Packing via a Multiple Gripper Picker

       Internal optical, tape, or diskette devices in library
boxes are serviced by robotic picker mechanisms.  Operations
currently done by these pickers include removing old mount requests
from the internal devices, putting those old mount requests in the
cartridge storage area, retrieving the new mount requests, and
inserting the new mount requests in the target devices.

      This article shows how more cartridges than the number of
cartridge storage slots may be stored in a library box having one or
more pickers with more than one gripper on each picker.

      The number of multiple gripper picker mechanisms in a library
box is denoted by P. Each multiple gripper picker has N grippers,
where N > 1.  Then, the D devices in the library box, N-1 grippers of
each of the P pickers, and all of the cartridge storage slots S can
hold media cartridges.  This gives the following equation for the
number of cartridges which can be stored in a multiple gripper picker
library box:
      Number of Cartridges = D + P*(N-1) + S (1)

      The reason that more cartridges can be stored in the library
box than there are cartridge storage slots S is that there is one
free gripper on each picker.  Upon receiving a request for a
cartridge not already in a drive, one of the multiple gripper
pickers, with its one free gripper, would either (a) be carrying the
target cartridge or (b) would remove it from a cartridge slot with
its one free gripper and then place a dif...