Data distribution method in storage system, distribution apparatus, and storage system

A storage system, comprising:

• a storage device, comprising:
• at least two storage controllers;
• and
• multiple storage units, wherein each storage unit is configured with any one of the at least two storage controllers as a home storage controller;
• a distribution apparatus, comprising:
• a processing unit;
• a host interaction unit;
• and
• a switch unit coupled to the processing unit, wherein the host interaction unit is connected to the processing unit using the switch unit;
• the host interaction unit is provided with a front-end interface, wherein the front-end interface is configured to connect to a host device, and the switch unit is provided with at least two back-end interfaces, wherein each back-end interface is connected to each storage controller in a one-to-one correspondence manner;
• the host interaction unit is configured to:
• receive, using the front-end interface, an IO read/write instruction sent by the host device;
• and
• forward the IO read/write instruction to the processing unit using the switch unit;
• and
• the processing unit is configured to:
• receive the IO read/write instruction forwarded by the host interaction unit;
• determine, according to an identifier of a to-be-read/written storage unit and carried in the IO read/write instruction, a home storage controller corresponding to the to-be-read/written storage unit;
• and
• forward, using a back-end interface connected to the home storage controller corresponding to the to-be-read/written storage unit and provided in the switch unit, the IO read/write instruction to the home storage controller corresponding to the to-be-read/written storage unit.

A distribution apparatus, comprising:

• a processing unit,
• a host interaction unit, and
• a switch unit coupled to the processing unit, wherein the host interaction unit is connected to the processing unit using the switch unit;
• the host interaction unit is provided with a front-end interface, wherein the front-end interface is configured to connect to a host device;
• and the switch unit is provided with at least two back-end interfaces, and the at least two back-end interfaces are configured to connect to at least two storage controllers in a storage device, wherein each back-end interface is connected to each storage controller in a one-to-one correspondence manner, and each storage unit of the storage device is configured with any one of the at least two storage controllers as a home storage controller;
• the host interaction unit is configured to:
• receive, using the front-end interface, an IO read/write instruction sent by the host device;
• and
• forward the IO read/write instruction to the processing unit using the switch unit;
• and
• the processing unit is configured to:
• receive the IO read/write instruction forwarded by the host interaction unit;
• determine, according to an identifier of a to-be-read/written storage unit and carried in the IO read/write instruction, a home storage controller corresponding to the to-be-read/written storage unit;
• and
• forward, using a back-end interface connected to the home storage controller corresponding to the to-be-read/written storage unit and provided in the switch unit, the IO read/write instruction to the home storage controller corresponding to the to-be-read/written storage unit.

A data distribution method applied in a storage system comprising a distribution apparatus and a storage device, the storage device comprises at least two storage controllers and multiple storage units, each storage unit is configured with any one of the at least two storage controllers as a home storage controller, the distribution apparatus comprises a front-end interface and at least two back-end interfaces, the front-end interface is configured to connect to a host device, and each back-end interface is connected to each storage controller in a one-to-one correspondence manner;

• the method comprising:
• receiving, by the distribution apparatus using the front-end interface, an IO read/write instruction sent by the host device, wherein the IO read/write instruction carries an identifier of a to-be-read/written storage unit;
• determining, by the distribution apparatus, a home storage controller of the to-be-read/written storage unit according to the identifier of the to-be-read/written storage unit;
• and
• forwarding, by the distribution apparatus, the IO read/write instruction to the home storage controller of the to-be-read/written storage unit using a back-end interface connected to the home storage controller of the to-be-read/written storage unit.