A computer implemented method, apparatus, and computer usable program code for providing access to block storage. A source virtual input/output server is retrieved, parameters are used by the source virtual input/output server to provide a client access to the block storage when the client is located on a first logical partitioned data processing system with the source virtual input/output server, wherein the client accesses the block storage through the source virtual input/output server. Access for the client to the block storage is migrated to a target virtual input/output server located on a second logical partitioned data processing system using the parameters, wherein the parameters are used on the target virtual input/output server to provide the client access to the block storage when the client is migrated to the second data processing system.