Computer system, managing computer and recovery management method

A managing computer for managing a storage system retaining a journal of the data stored in the volume and a volume replicating the data stored in the volume and restoring the data stored in the volume at any update time point by the journal and the replicated volume, the managing computer forming a computer system by the storage system being connected via a network and a host computer for reading and writing data stored in the volume of the storage system, the managing computer comprising:

• a memory for storing the storage management information;
• a CPU for controlling the operation of the whole managing computer;
• and
• an interface for network connection;
• wherein the managing computer acquires a register creation demand for the volume retaining the journal, including a recovery time objective which is the time of recovery and/or a recovery point objective which is the update time point and a journal retention period which is the period during which the journal is retained, monitors the journal of the data stored in the volume, computes the quantity of the journal, and determines the capacity of the volume for retaining the journal.

A recovery management method of a computer system comprising a storage system having a volume which is a storage area, a managing computer for managing the storage system, and a host computer for reading and writing data stored in the volume of the storage system, which are connected via a network, wherein the recovery management method comprises:

• retaining a journal of the data stored in the volume and a volume replicating the data stored in the volume;
• restoring the data stored in the volume at any update time point by the journal and the replicated volume;
• acquiring a register creation demand for the volume retaining the journal, including a recovery time objective which is the time of recovery and/or a recovery point objective which is the update time point and a journal retention period which is the period during which the journal is retained;
• monitoring the journal of the data stored in the volume;
• computing the quantity of the journal;
• and
• determining the capacity of the volume for retaining the journal.