Patent ID: 7328287
Filing Date: 2008-02-05
Classification: G06F

Abstract:
1. A system comprising: a volume server; a first and a second volume client; and one or more physical block devices; wherein the volume server is configured to: wherein the first I/O access policy differs from the second I/O access policy; wherein the volume server is further configured to maintain an entry in a configuration database for each of the first and second volume clients, wherein the entry associates a particular I/O access policy with a given logical volume; wherein in response to a reconfiguration command, the volume server is further configured to update one or more entries in the configuration database and send an invalidation message for the first I/O access policy to the first volume client; wherein, in response to the invalidation message, the first volume client is further configured to place pending I/O operations to the logical volume in a paused state and send a request for an updated I/O access policy to the volume server.