Patent ID: 7640316
Filing Date: 2009-12-29
Classification: G06F

Abstract:
1. A method to write information to two virtual tape servers, comprising the steps of: supplying a data storage and retrieval system comprising a host computer, a first virtual tape controller (“VTC”) comprising a VTC Copy Queue, a second virtual tape controller, a first virtual tape server (“VTS”), and a second virtual tape server, wherein said first virtual tape controller comprises a first virtual host device and a first virtual copy device, and wherein said second virtual tape controller comprises a second virtual host device and a second virtual copy device, and wherein said first virtual tape server comprises a third virtual host device and a third virtual copy device, and wherein said second virtual tape server comprises a fourth virtual host device and a fourth virtual copy device, wherein said host computer communicates with said first virtual tape server using a host/VTS bandwidth, wherein said host computer communicates with said second virtual tape server via said second virtual host device and said fourth virtual host device, and wherein said first virtual tape server communicates with said second virtual tape server using a VTS/VTS bandwidth; writing a host computer file to said second virtual host device disposed in said first virtual tape server; queuing a copy job in said VTC Copy Queue, wherein said copy job comprises copying said host computer file to said second virtual tape server; determining an age of said queued copy job; setting an age threshold; determining if the age of said queued copy job is greater than said age threshold; operative if the age of said queued copy job is greater than said age threshold, decreasing said host/VTS bandwidth and increasing said VTS/VTS bandwidth.