Storage system and storage control method
AssigneeHitachi, Ltd.
InventorsKazuki MATSUGAMI, Tomohiro YOSHIHARA, Takashi NAGAO
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Abstract
A data store volume (DSVOL) for a snapshot group which is a group of the PVOL and one or more SVOLs for the PVOL is a data storage region where data of which a storage destination is one volume (VOL) of the snapshot group and meta-information of the data are stored, and the meta-information is information including address mapping between a reference source address which is an address of a position of the data in the snapshot group and a reference destination address which is an address of a position of the data in the DSVOL. A process of a storage system increases the number of DSVOLs in the snapshot group when an input/output (I/O) load on the snapshot group exceeds a threshold.
Claims13
A storage system comprising:
- a processor configured to produce a secondary volume (SVOL) which is a snapshot of a primary volume (PVOL),
- wherein a data store volume (DSVOL) for a snapshot group which is a group of the PVOL and one or more SVOLs for the PVOL is a data storage region where data of which a storage destination is one volume (VOL) of the snapshot group and meta-information of the data are stored, and the meta-information is information including address mapping between a reference source address which is an address of a position of the data in the snapshot group and a reference destination address which is an address of a position of the data in the DSVOL,
- wherein the processor executes I/O for updating the meta-information of data in a write process which is a process of a write request for updating the data in one VOL of the snapshot group with respect to the DSVOL storing meta-information, and
- wherein the processor
- determines whether an input/output (I/O) load on the snapshot group exceeds a threshold, and
- increases the number of DSVOLs for the snapshot group when a determination result is positive.
A storage control method of a storage system producing a secondary volume (SVOL) which is a snapshot of a primary volume (PVOL),
- wherein a data store volume (DSVOL) for a snapshot group which is a group of the PVOL and one or more SVOLs for the PVOL is a data storage region where data of which a storage destination is one volume (VOL) of the snapshot group and meta-information of the data are stored, and the meta-information is information including address mapping between a reference source address which is an address of a position of the data in the snapshot group and a reference destination address which is an address of a position of the data in the DSVOL,
- wherein the storage system executes I/O for updating the meta-information of data in a write process which is a process of a write request for updating the data in one VOL of the snapshot group with respect to the DSVOL storing meta-information, and
- wherein the storage control method comprises:
- determining whether an input/output (I/O) load on the snapshot group exceeds a threshold, and
- increasing the number of DSVOLS for the snapshot group when the determination result is positive.
Dependencies are inferred from the claim text.