Computer system and method of controlling computer system

摘要

In order to reduce the amount of consumption of a back-end bandwidth in a storage apparatus, a computer system includes: a first storage device; and a second storage device that is coupled to the first controller through a first interface and is coupled to the second controller through a second interface. The first controller receives data from a host computer through a first communication channel; write the received data into the first storage device; identify part of the received data as first data, the part satisfying a preset particular condition; and write a replica of the first data as second data into the second storage device. The second controller reads the second data from the second storage device in response to a Read request received from the host computer through a second communication channel; and transmit the second data to the host computer through the second communication channel.

主权项

1. A storage system comprising:
a first controller coupled to a first host computer and a second host computer; a second controller coupled to the first host computer and the second host computer; a first storage device coupled to the first controller; and a second storage device including a first interface according to a first protocol and a second interface according to a second protocol which is different from the first protocol, the first interface coupled to the first controller and the second interface coupled to the second controller, wherein the first controller is configured to:
receive a write request with a first data from the first host computer,store the first data to the first storage device,write difference data based on an update of the first data in the first storage device, from the first storage device to the second storage device via the first interface of the second storage device, andupdate mapping information of the difference data, and the second controller configured to:
after the update of the mapping information, broadcast a message to the first and second host computers,receive a read request from the second host computer,read a second data which is at least a part of the difference data from the second storage device via the second interface of the second storage device in response to receiving the read request, andsend the second data to the second host computer, and wherein writing the difference data further comprises:
detecting a request to replicate a first volume from the first storage device to the second storage device,retrieving the mapping information to identify the difference data associated with the first volume, andreplicating the difference data associated with the first volume to a second volume in the second storage device.