Method and apparatus for recovery of a logical volume in a multi copy storage system

A data storage apparatus configured to store data from a host on a plurality of physical data storage media devices, the apparatus comprising:

• a local data storage cache within a dual copy data storage apparatus;
• a primary logical volume stored on a primary physical data storage media device;
• a secondary logical volume stored on a secondary physical data storage media device;
• a primary record stored on the cache in a primary directory and configured to point to the primary logical volume;
• a secondary record stored on the cache and configured to point to the secondary logical volume;
• a recovery module configured to implement a recovery action to recover the secondary logical volume in response to a failure to access the primary logical volume;
• and
• the recovery module further configured to implement the recovery action in a manner that is substantially transparent to the host.

A data storage system configured to recover a logical volume, the system comprising:

• a dual copy data storage apparatus including a plurality of physical volumes;
• a host configured to request data access to a plurality of logical volumes stored on the plurality of physical volumes of the dual copy data storage apparatus;
• a recovery module configured to implement a recovery action to recover a secondary logical volume on a secondary physical volume in response to a failure to access a primary logical volume on a primary physical volume;
• and
• the recovery module further configured to implement the recovery action in a manner that is substantially transparent to the host.

A method for recovering a logical volume in a data storage system, the method comprising:

• acknowledging a recall error generated in response to a failure to access a primary logical volume located on a primary physical volume;
• accessing a secondary record located on a cache within a dual copy data storage system;
• and
• recovering a secondary logical volume located on a secondary physical volume.

A computer readable medium comprising a computer code configured to carry out a method for recovering a logical volume in a data storage system, the method comprising:

• acknowledging a recall error generated in response to a failure to access a primary logical volume located on a primary physical volume;
• accessing a secondary record configured to point to the secondary logical volume and located on a cache within a dual copy data storage system;
• overwriting a primary record configured to point to the primary logical volume and located on the system cache with the secondary record;
• and
• recovering a secondary logical volume located on a secondary physical volume.

A data storage apparatus configured to store data from a host on a plurality of physical data storage media devices, the apparatus comprising:

• means for acknowledging a recall error generated in response to a failure to access a primary logical volume located on a primary physical volume;
• means for accessing a secondary record located on a cache within a dual copy data storage system;
• means for overwriting a primary record located on the system cache with the secondary record;
• and
• means for recovering a secondary logical volume located on a secondary physical volume.