Storage controller and data management method

摘要

This storage controller providing a volume for storing data transmitted from a host system includes a management unit for managing the data written in the volume with a first block area, or a second block area in the first block area which is smaller than the first block area; a snapshot acquisition unit for acquiring a snapshot of the volume at a prescribed timing; and a transfer unit for transferring the data of the volume acquired with the snapshot of the snapshot acquisition unit to an external device with the first block area or the second block area.

主权项

1. A storage controller comprising:
a processor configured to:
manage a primary volume, a virtual volume and a snapshot of the primary volume at a certain timing, the primary volume storing data sent from a host system and being paired with a secondary volume in another storage controller, the virtual volume storing differential data of the snapshot to be sent to the another storage controller;manage the differential data, including a first type data and a second type data in a plurality of data of the snapshot based on an amount of each type of the differential data, the second type data having a size smaller than a size of the first type data; andcontrol to send the plurality of data of the snapshot to the another storage controller so that the another storage controller stores the plurality of data of the snapshot in the secondary volume.