US 2013/0159647 A1 · COMPUTER SYSTEM AND RECLAMATION CONTROL METHOD

Abstract

A computer system and reclamation control method capable of effectively utilizing storage resources of a storage system even under the circumstance where the storage system is operated according to thin provisioning and a file server can obtain snapshots. The present invention is designed so that if a block, to which a host does not refer, but reference from a snapshot remains, exists in a virtual volume of an operation volume, temporary data is written to this block; and as triggered by this writing, data before writing is saved to a difference volume, so that the reference from the snapshot to this block is released and then this block can be reclaimed.

Claims10

Dependent claims

A computer system comprising:

a file server for providing a primary volume, which is a data read/write access destination, and a snapshot of the primary volume to a host;
and a storage system for setting a virtual volume to the primary volume, al-locating a storage block from a pool to the virtual volume in response to write access from the host to the primary volume, and writing data to the storage block;
wherein if it is determined that there is a specified area of the primary volume to which a file system does not refer and the snapshot refers, the file server writes temporary data to a specified storage block corre-sponding to the specified area among a plurality of storage blocks and thereby releases the reference from the snapshot to the specified area;
and
the storage system releases the specified storage block from allocation to the virtual volume.

2 more elements

Dependencies are inferred from the claim text.

Computer system and reclamation control method

Life of this patent

Computer system and reclamation control method

Life of this patent

Abstract

Claims10