Patent ID: 7966354
Filing Date: 2011-06-21
Classification: G06F

Abstract:
1. A computer which is connected to a storage system, the storage system comprises a plurality of data storage extents, writes write-data conforming to a write request to a first data storage extent specified in the write request, and retains backup data of the first data storage extent in one or more second data storage extents using a first backup method, the computer comprising: an acquisition module for acquiring a backup status in use of the first backup method at a prescribed period; a computation module for computing a first backup performance using a first backup configuration, which is defined by a first corresponding relationship between the first data storage extent and the one or more second data storage extents, and the first backup method, based on the acquired backup status; an estimation module for estimating a second backup performance using a second backup configuration, which is defined by a second corresponding relationship between the first data storage extent and one or more second data storage extents, and a second backup method, based on a prescribed assumption in the prescribed period; an output module for outputting information based on the computed first backup performance and the estimated second backup performance; and a reception module for receiving a write-amount, which is the amount of write-data at each point-in-time interval for the first data storage extent in the storage system, wherein the acquisition module acquires respective write times at which data has been written to the second data storage extent in use of the first backup method at the prescribed period; the computation module computes a first data protection period, which is a time period from the oldest time at which backup data is recoverable using the first backup method until a targeted time, for the respective targeted times in the prescribed period, based on the respective acquired write times; the estimation module estimates a second data protection period, which is a time period from the oldest time at which backup data is recoverable using the second backup method until a targeted time, for the respective targeted times in the prescribed period, based on the write-amount at each of the received point-in-time interval; the second backup configuration is a Continuous Data Protection (CDP) backup configuration; the second data storage extents in the second backup configuration include a base data storage extent, in which base data that is a replication of data stored in the first data storage extent is stored, and a journal storage extent, in which a journal that is information related to a write history in the first data storage extent and that is reflected in the base data, is stored; the estimation module estimates an amount of stored journals, which is an amount of journals stored in the journal storage extent, for the respective targeted times at the prescribed period based on the write-amount at each received point-in-time interval, and estimates the second data protection period for the respective targeted time based on the write-amount at each the received point-in-time interval and the amount of stored journals at the respective targeted times; and an estimation equation for the amount of stored journals C where, C