Apparatus, method and program product for determining the data recall order

Patent metadata

Field	Value
Publication number	US-9104318-B2
Application number	US-201414243505-A
Country	US
Kind code	B2
Filing date	Apr 2, 2014
Priority date	Sep 29, 2008
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

To provide a technique for optimizing the processing order of recall requests in which the average latency time of a host apparatus is minimized. A storage manager accepts a request of the host apparatus for the recalling data from a tape library, and stores the request in a queue table. In response to storage of the request, the storage manager calculates the latency time for each request in all the conceivable execution orders for all the requests stored in the queue table. The storage manager determines the execution order which minimizes the total calculated latency time for all the requests including the active request, and rearranges the requests in the queue table.

First claim

What is claimed is:

1. An apparatus for use with a tape library and for determining a data recall order, the apparatus comprising:
first latency time prediction means for predicting a latency time, from an acceptance of each request for data required to be recalled from said tape library, to completion of a process in said tape library, in performing the process in each of all the execution orders conceivable for all the requests stored in a queue table;
first execution order de…

Assignees

• IBM

Inventors

• Iwasaki Norie
• Oishi Yutaka
• Taketomi Tomoko
• Tsuruta Kazuhiro

Classifications

• G06F3/0686

  Physics · mapped topic

• G06F3/0635

  Physics · mapped topic

• G06F3/0659

  Physics · mapped topic

• G06F3/0611 Primary

  Physics · mapped topic

• G06F12/0238

  Physics · mapped topic