Shared virtualized local storage

Patent metadata

Field	Value
Publication number	US-9733845-B2
Application number	US-201414499514-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 29, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An embedded processing unit (eCPU) processes an input/output (I/O) request from a host using a virtual storage controller. The eCPU associates a virtual network interface with a host. The virtual storage controller uses a first transport protocol. The eCPU receives an I/O request directed at a storage device from the virtual storage controller. The eCPU determines a second transport protocol used by the storage device, and converts the I/O request from a format according to the first transport protocol to a format according to the second transport protocol. The eCPU transmits the I/O request to the storage device using the second transport protocol.

First claim

What is claimed is:

1. A method comprising:
associating a first virtual storage controller with a first host, wherein the first virtual storage controller uses a first transport protocol;
receiving a first input/output (I/O) request from the first virtual storage controller using the first transport protocol, the first I/O request directed at a storage device;
determining a second transport protocol used by the storage device;
converting the first I/O request from a format according to the first transport protocol to a format according to the second transport protocol;
storing the first I/O request from the first virtual storage controller in a request queue;
receiving a second I/O request from a second virtual storage controller associated with a second host;
converting the second I/O request from the format according to the first transport protocol to the format according to the second transport protocol;
storing the second I/O request from the second virtual storage controller in the request queue; and
transmitting the first I/O request and the second I/O request from the request queue to the storage device.

2. The method of claim 1 , further comprising:
receiving a first I/O result from the storage device in accordance with the second transport protocol;
converting the first I/O result from a format according to the second transport protocol to a format according to the first transport protocol; and
transmitting the first I/O result to the first host via the first virtual storage controller using the first transport protocol.

3. The method of claim 1 , wherein the first transport protocol is a Small Computer System Interface (SCSI) protocol.

4. The method of claim 3 , wherein the storage device is accessed through the second transport protocol by one of Fibre Channel protocol, or the SCSI over Internet Protocol (iSCSI).

5. The method of claim 3 , wherein the storage device is one of a direct-attached storage (DAS) device or a network-attached storage (NAS) device.

6. The method of claim 3 , wherein the storage device comprises a Redundant Array of Independent Devices (RAID).

7. The method of claim 1 , further comprising:
receiving a second I/O result for the second I/O request;
storing the second I/O result in a result queue;
converting the second I/O result from a format according the second transport protocol to a format according to the first transport protocol; and
transmitting the second I/O result to the second host via the second virtual storage controller using the first transport protocol.

8. The method of claim 1 , further comprising:
receiving a third I/O request from the first virtual storage controller, the third I/O request directed at a second storage device;
determining a third transport protocol used by the second storage device;
converting the third I/O request to a format according to the third transport protocol; and
transmitting the third I/O request to the second storage device using the third transport protocol.

9. An apparatus comprising:
one or more virtual storage controllers associated with one or more hosts, the one or more virtual storage controllers using a first transport protocol;
one or more storage drivers to communicate with one or more storage devices;
one or more processors to:
receive a first input/output (I/O) request from a first virtual storage controller among the one or more virtual storage controllers, the first I/O request directed at a first storage device among the one or more storage devices;
determine a second transport protocol used by the one or more storage drivers to communicate with the first storage device;
convert the first I/O request from a format according to the first transport protocol to a format according to the second transport protocol; and
store the first I/O request from the first virtual storage controller in a request queue;
receive a second I/O request from a second virtual storage controller associated with a second host;
convert the second I/O request from the format according to the first transport protocol to the format according to the second transport protocol;
store the second I/O request from the second virtual storage controller in the request queue; and
transmit the first I/O request and the second I/O request from the request queue to the storage device.

10. The apparatus of claim 9 , wherein the processor further:
receives a first I/O result from the first storage device in accordance with the second transport protocol via the one or more storage drivers;
converts the first I/O result from a format according to the second transport protocol to a format according to the first transport protocol; and
transmits the first I/O result to the first host via the first virtual storage controller using the first transport protocol.

11. The apparatus of claim 9 , wherein the first transport protocol is a Small Computer System Interface (SCSI) protocol.

12. The apparatus of claim 11 , wherein the first storage device is accessed through the second transport protocol by one of Fibre Channel protocol, or the SCSI over Internet Protocol (iSCSI).

13. The apparatus of claim 11 , wherein the first storage device is one of a direct-attached storage (DAS) device or a network-attached storage (NAS) device.

14. The apparatus of claim 11 , wherein the first storage device comprises a Redundant Array of Independent Devices (RAID).

15. The apparatus of claim 10 , wherein the processor further:
receives a second I/O result for the second I/O request;
stores the second I/O result in a result queue;
converts the second I/O result from a format according the second transport protocol to a format according to the first transport protocol; and
transmits the second I/O result to the second host via the second virtual storage controller using the first transport protocol.

16. The apparatus of claim 9 , wherein the processor further:
receives a third I/O request from the first virtual storage controller, the third I/O request directed at a second storage device;
determines a third transport protocol used by the second storage device;
converts the third I/O request to a format according to the third transport protocol; and
transmits the third I/O request to the second storage device using the third transport protocol.

17. A system comprising:
one or more host devices;
one or more storage devices; and
a virtual interface card to:
associate a first virtual storage controller with a first host among the one or more hosts, wherein the first virtual storage controller uses a first transport protocol;
receive a first input/output (I/O) request from the first virtual storage controller using the first transport protocol, the first I/O request directed at a first storage device among the one or more storage devices;
determine a second transport protocol used by the first storage device;
convert the first I/O request from a format according to the first transport protocol to a format according to the second transport protocol; and
store the first I/O request from the first virtual storage controller in a request queue;
receive a second I/O request from a second virtual storage controller associated with a second host;
convert the second I/O request from the format according to the first transport protocol to the format according to the second transport protocol;
store the second I/O request from the second virtual storage controller in the request queue; and
transmit the first I/O request and the second I/O request from the request queue to the storage

Assignees

• Cisco Tech Inc

Inventors

• Smith James B
• Baddela Sesidhar

Classifications

• G06F3/0689

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/0619 Primary

  in relation to data integrity, e.g. data losses, bit errors · CPC title

• G06F3/0626

  Reducing size or complexity of storage systems · CPC title

• G06F3/0661

  Format or protocol conversion arrangements · CPC title

• G06F3/0665

  at area level, e.g. provisioning of virtual or logical volumes · CPC title