Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method for storage volumes in a cascade of storage volumes including starting a first data map relating a first storage volume to a second storage volume while a second data map relating the first storage volume and a third storage volume is active. Starting the first data map uses a zone map that relates the first storage volume to a zone within the cascade of storage volumes.

Abstract: A method of performing cascaded flashcopy (FC) including starting a flashcopy map when a target disk is already a source of an active FC map. A computer storage system includes a configuration that allows a flashcopy (FC) map to be started when a target disk is already the source of an active FC map.

Abstract: A method of performing cascaded flashcopy (FC) including starting a flashcopy map when a target disk is already a source of an active FC map. A computer storage system includes a configuration that allows a flashcopy (FC) map to be started when a target disk is already the source of an active FC map.

Abstract: A method of performing cascaded flashcopy (FC) including starting a flashcopy map when a target disk is already a source of an active FC map. A computer storage system includes a configuration that allows a flashcopy (FC) map to be started when a target disk is already the source of an active FC map.

Abstract: Apparatus for non-disruptive error recovery in a clustered system, comprises a node instance configuration activity quiescing component for quiescing configuration activity at a first virtual node instance; a node instance creation component for creating a second virtual node instance with I/O access blocked; a configuration transfer component for transferring configuration data from the first to the second virtual node instance; a commit component for committing the changeover from the first to the second virtual node instance; a node instance communications blocking component for blocking inbound communications to a first virtual node instance; a node instance communications unblocking component for unblocking I/O access at the second virtual node instance; a communication control component for monitoring outbound communications from the first virtual node instance and signalling completion of all pending outbound communications; and a node instance deletion component for deleting the first virtual node ins

Abstract: The present invention provides for a method for managing the storage of data in a computing system that includes a data processor and local physical storage, involving the steps of: defining a virtual storage volume for access by the data processor, the data processor including a local storage pool mapped to the local physical storage and a remote storage pool mapped to physical storage at a remote site, and the virtual storage volume being overallocated with respect to the local storage pool; and migrating data between the local storage pool and the remote storage pool according to a defined migration policy.

Abstract: An apparatus, method, and computer program for facilitating disaster recovery of a first computer system, wherein first data residing on a first storage device associated with the first computer system is recoverable from second data residing on a second storage device associated with a second computer system and wherein the second storage device is operable to have an associated state of powered up or powered down. A receiver receives an update operation for updating the second storage device. A processor updates a non-volatile storage means with the update operation, prior to update of the second storage device, wherein the non-volatile storage means is associated with the second computer system.

Abstract: Apparatus for non-disruptive error recovery in a clustered system, comprises a node instance configuration activity quiescing component for quiescing configuration activity at a first virtual node instance; a node instance creation component for creating a second virtual node instance with I/O access blocked; a configuration transfer component for transferring configuration data from the first to the second virtual node instance; a commit component for committing the changeover from the first to the second virtual node instance; a node instance communications blocking component for blocking inbound communications to a first virtual node instance; a node instance communications unblocking component for unblocking I/O access at the second virtual node instance; a communication control component for monitoring outbound communications from the first virtual node instance and signalling completion of all pending outbound communications; and a node instance deletion component for deleting the first virtual node ins

Abstract: A method of performing cascaded flashcopy (FC) including starting a flashcopy map when a target disk is already a source of an active FC map. A computer storage system includes a configuration that allows a flashcopy (FC) map to be started when a target disk is already the source of an active FC map.

Abstract: An apparatus for managing pooled real storage having a usable real storage pool and a reserve real storage pool in a virtualized storage system, comprises an extent controller for allocating and freeing storage extents in said usable real storage pool; a storage use monitor for monitoring storage use in said usable real storage pool; and a reserve pool manager responsive to said storage use monitor for transferring storage extents between said usable real storage pool and said reserve real storage pool.

Abstract: An apparatus for controlling a configuration change in a storage system having a plurality of storage appliances with an I/O handler local to each storage appliance for transmitting and receiving I/O requests. A local volume mapper local to each storage appliance maps storage local to the storage appliance; a remote volume mapper local to each storage appliance maps storage remote from the or each storage appliance; and a spanning host interface layer responsive to detection of the configuration change receives and redirects I/O requests among the plurality of storage appliances.

Abstract: The present invention provides for a method for managing the storage of data in a computing system that includes a data processor and local physical storage, involving the steps of: defining a virtual storage volume for access by the data processor, the data processor including a local storage pool mapped to the local physical storage and a remote storage pool mapped to physical storage at a remote site, and the virtual storage volume being overallocated with respect to the local storage pool; and migrating data between the local storage pool and the remote storage pool according to a defined migration policy.

Abstract: An apparatus, method, and computer program for facilitating disaster recovery of a first computer system, wherein first data residing on a first storage device associated with the first computer system is recoverable from second data residing on a second storage device associated with a second computer system and wherein the second storage device is operable to have an associated state of powered up or powered down. A receiver receives an update operation for updating the second storage device. A processor updates anon-volatile storage means with the update operation, prior to update of the second storage device, wherein the non-volatile storage means is associated with the second computer system.

Abstract: An apparatus, method, and computer program for facilitating disaster recovery of a first computer system, wherein first data residing on a first storage device associated with the first computer system is recoverable from second data residing on a second storage device associated with a second computer system and wherein the second storage device is operable to have an associated state of powered up or powered down. A receiver receives an update operation for updating the second storage device. A processor updates anon-volatile storage means with the update operation, prior to update of the second storage device, wherein the non-volatile storage means is associated with the second computer system.