Storage system having a plurality of flash packages

摘要

A storage system 100, which has a plurality of flash packages 230, has a function for minimizing the imbalance of the number of deletions of each block inside the flash package 230 and a block-unit capacity virtualization function, and efficiently manifests lessening of the imbalance of the number of deletions and reduction in the data storage capacity for the entire storage system 100 by having functions for calculating the number of deletions and the data occupancy of each flash package 230, and for transferring data between the flash packages 230 on the basis of the values of these number of deletions and data occupancy.

主权项

1. A system comprising:
a plurality of storage devices, each of which includes a plurality of flash chips, each having a plurality of physical blocks as a unit of data deletion, and a device controller balancing data deletion among the physical blocks within the first storage devices; and a processor which configures: a plurality of data areas, each of which storing at least one record set including a plurality of data records and a parity record generated from the plurality of data records by RAID function, and each of which is based on the plurality of the storage devices, wherein the processor is configured to: obtain information relating to data deletion of each of the plurality of the storage devices; select, based on a plurality of life expectancies of the plurality of data areas which are calculated from the information relating to data deletion, at least one transfer-source data area of the plurality of the data areas from which a record set is transferred and at least one transfer-destination data area of the plurality of the data areas to which the record set is transferred, where the life expectancy of the transfer-destination data area is different from the life expectancy of the transfer-source data area; and transfer the record set from the transfer-source data area to the transfer-destination data area.