Switching method of data replication mode
AssigneeHitachi, Ltd.
InventorsNaoko Maruyama, Yuichi Taguchi, Ryoji Furuhashi, Yasunori Kaneda
Life of this patent
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Abstract
In remote data replication between storage systems, there are cases where the storage extent capacity used as the temporary storage extent in the storage system will incur waste. In a system having a management computer, a host computer, a first storage system, and a second storage system, when maintaining the replicated data of the first storage system in the second storage system via remote data replication, a change or the like in the traffic from the host computer to the first storage system is monitored, and the management computer instructs the storage system to switch the remote data replication mode in accordance with such traffic.
Claims14
A storage system which is connectable to another storage system and a computer via a network, comprising:
- a controller;
- a plurality of interfaces connected to the controller and the network;
- and
- a plurality of storage devices connected to the controller,
- wherein the controller executes a transferring of data, which is to be stored in the plurality of storage devices based on an I/O request issued by the computer, to the another storage system via the network using one of a plurality of copy modes,
- wherein the controller switches the one of the plurality of copy modes to another one of the plurality of copy modes based on an access rate of I/O requests from the computer to the storage system and executes transferring data using said another one of the plurality of copy modes, wherein the plurality of copy modes comprise first and second copy modes, respectively,
- wherein the controller indicates completion of the I/O request after receiving notification of completion of storing the data from the another storage system when the first copy mode is used,
- wherein the controller indicates completion of the I/O request before receiving notification of completion of storing the data from the another storage system when the second copy mode is used, wherein the controller switches from the first copy mode to the second copy mode when the access rate exceeds a threshold,
- wherein the controller switches from the second copy mode to the first copy mode when the access rate drops below the threshold, and
- wherein the threshold is determined based on a formula.
A system comprising:
- a first storage system connected to a computer and to a second storage system via a network;
- and
- a management computer connected to the first and the second storage system,
- wherein the first storage system comprises a plurality of storage devices,
- wherein the first storage system executes a transferring of data, which is to be stored in the plurality of storage devices based on an I/O request issued by the computer, to the second storage system via the network based on one of a plurality of copy modes,
- wherein the management computer gathers information of access frequency between the computer and the first storage system from the first storage system, decides to change the one of the plurality of copy modes to another one of the plurality of copy modes or not based on the gathered information of access frequency, and sends a command which indicates to the first storage system to change from the one of the plurality of copy modes to another one of the plurality of copy modes,
- wherein the first storage system changes the one of the plurality of copy modes to the another one of the plurality of copy modes based on the command and executes transmitting data to the second storage system based on the another one of the plurality of copy modes,
- wherein said one and said another copy modes comprise first and second copy modes, respectively,
- wherein the first storage system indicates completion of the I/O request after receiving notification of completion of storing the data from the second storage system when the first copy mode is used, and
- wherein the first storage system indicates completion of the I/O request before receiving notification of completion of storing the data from the second storage system when the second copy mode is used.
A storage system connected to a computer and an another storage system, via a network, comprising:
- means for controlling the storage system;
- means for connecting to the controlling means and the network;
- storing means for storing data;
- means for copying data from the storage system to the another storage system using one of a plurality of copy modes;
- and
- changing means for changing a copy mode of the storage system in accordance with an access frequency of I/O requests from said computer to said storage system,
- wherein the controlling means stores journal data to the storing means, and further comprising means for reserving or releasing a storage area of the storage means used for said journal data depending on the copy mode being used.
Dependencies are inferred from the claim text.