Patent ID: 7398302
Filing Date: 2008-07-08
Classification: G06F,H04L

Abstract:
1. A method for handling a remote copy request in a distributed storage system, the method comprising: providing a plurality of primary volumes within a primary storage system that is coupled to a primary host via a first network, the primary storage system being coupled to a secondary storage system via a second network, wherein each primary volume is assigned a priority; selecting a first request from a plurality of requests placed in a queue based on priority information associated with the requests, wherein each request is directed to a given primary volume and is assigned the same priority as the given primary volume; selecting a first path group from one or more path groups that could be used to transmit the request; transmitting the first request to the secondary storage system using the first path group, the secondary storage system including a plurality of secondary volumes that are paired to the plurality of primary volumes; receiving a second request at the primary storage system from the primary host; identifying a primary volume to which the second request is directed; determining the priority of the primary volume to which the second request is directed; and assigning the same priority to the second request as the priority of the primary volume to which the second request is directed, wherein the primary storage system includes a path selection table that is accessed to determine the priority of the primary volume, wherein the path selection table associates each of the primary volumes with one or more path groups and the priority.