Techniques for data storage device virtualization

• US 8,032,689 B2
• Filed: 12/18/2007
• Issued: 10/04/2011
• Est. Priority Date: 12/18/2007
• Status: Expired due to Fees

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Hitachi Global Storage Technologies Netherlands BV (Western Digital Corporation)
• Inventors: Kulkarni, Anand Krishnamurthi
• Primary Examiner(s): PORTKA, GARY J
• Application Number:
  US11/959,293
• Publication Number:
  US 20090157942A1
• Time in Patent Office: 1,386 Days
• Field of Search: None
• US Class Current: 711/6
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/0629 Configuration or reconfiguration of storage systems
• CPC Class Codes: G06F 3/0664 at device level, e.g. emulation of a storage device or system
• CPC Class Codes: G06F 3/0673 Single storage device

Abstract

A data storage device comprises virtual storage devices that are each assigned to a subset of data sectors in a non-volatile memory of the data storage device. The data storage device receives configuration metadata for configuring each of the virtual storage devices from a host operating system. The configuration metadata is received in a standard format that is file system independent. The configuration metadata comprises a range of logical block addresses and a virtual storage device number assigned to each of the virtual storage devices. Each of the virtual storage device numbers is a unique identifier used by the data storage device to differentiate between the virtual storage devices. The data storage device uses the virtual storage device numbers and logical block addresses to identify data sectors in the virtual storage devices that are accessible by virtual machine operating systems.

Claims

1. A data storage device comprising:

virtual storage devices that are each assigned to a subset of data sectors in a non-volatile memory of the data storage device, wherein the data storage device receives configuration metadata for configuring each of the virtual storage devices from a host operating system in a format that is not specific to a particular file system, the configuration metadata comprises a range of logical block addresses and a virtual storage device number assigned to each of the virtual storage devices, each of the virtual storage device numbers is a unique identifier used to differentiate between the virtual storage devices, the data storage device uses the virtual storage device numbers to map logical block addresses to physical addresses corresponding to data sectors in the virtual storage devices that are accessible by first and second virtual machine operating systems, the data storage device determines a set of the physical addresses to access based on the virtual storage device numbers when the first and the second virtual machine operating systems attempt to access the same one of the logical block addresses, the first virtual machine operating system accesses the subset of the data sectors of the data storage device assigned to a first one of the virtual storage devices, the second virtual machine operating system accesses the subset of the data sectors of the data storage device assigned to a second one of the virtual storage devices, and the first and the second virtual machine operating systems are part of a virtual machine.

2. The data storage device defined in claim 1 wherein the data storage device is a hard disk drive, and the virtual storage devices are virtual hard disk drives.

3. The data storage device defined in claim 1 wherein the virtual storage device numbers are logical unit numbers, and the data storage device communicates with the host operating system on a SCSI bus.

4. The data storage device defined in claim 1 wherein the virtual storage device numbers are port numbers, and the data storage device communicates with the host operating system on a SATA bus.

5. The data storage device defined in claim 1 wherein the configuration metadata is in a format that comprises a list of ordered pairs, each of the ordered pairs in the list of ordered pairs comprising a logical block address and a length, the length corresponding to a number of data sectors.

6. The data storage device defined in claim 2 wherein the hard disk drive comprises a virtual hard disk drive secure provider that receives virtual hard disk drive configuration data from the host operating system in an encrypted format.

7. The data storage device defined in claim 1 wherein the data storage device receives read and write commands from one of the first and the second virtual machine operating systems with ranges of logical block addresses and one of the virtual storage device numbers.

8. The data storage device defined in claim 1 wherein the data storage device initially receives one of the virtual storage device numbers, and subsequently, receives read and write commands with ranges of logical block addresses from one of the first and the second virtual machine operating systems, the read and the write commands not comprising one of the virtual storage device numbers.

9. The data storage device defined in claim 1 wherein the data storage device combines read and write commands from the first and the second virtual machine operating systems into a single queue, each of the read and the write commands comprising both a virtual storage device number and a range of logical blocks addresses.

10. A data storage device that comprises code for operating virtual storage devices, wherein the code is stored on a computer readable medium, the data storage device comprising:

code for configuring virtual storage devices in the data storage device by interpreting configuration metadata received from a host operating system in a format that is not specific to a particular file system, wherein the configuration metadata comprises a range of logical block addresses and a virtual storage device number for each of the virtual storage devices, each of the virtual storage device numbers is a unique identifier used to differentiate between the virtual storage devices, and each of the virtual storage devices is assigned to a subset of a non-volatile data storage capacity of the data storage device; and

code for using the virtual storage device numbers to map logical block addresses to physical addresses associated with data sectors for the virtual storage devices that are accessible in response to read and write commands from first and second virtual machine operating systems, determining a set of the physical addresses to access based on the virtual storage device numbers when the first and the second virtual machine operating systems attempt to access the same one of the logical block addresses, accessing data sectors associated with a first one of the virtual storage devices in response to commands from the first virtual machine operating system, and accessing data sectors associated with a second one of the virtual storage devices in response to commands from the second virtual machine operating system, wherein the first and the second virtual machine operating systems are part of a virtual machine.

11. The data storage device defined in claim 10 wherein the data storage device is a hard disk drive, and the virtual storage devices are virtual hard disk drives.

12. The data storage device defined in claim 11 wherein the code for configuring the virtual storage devices in the data storage device further comprises code for assigning a high performance setting to one of the virtual hard disk drives so that data stored in that virtual hard disk drive is stored on outer tracks of a hard disk in the hard disk drive.

13. The data storage device defined in claim 11 further comprising:

code for combining read and write commands from the first and the second virtual machine operating systems into a queue in the hard disk drive, wherein the code for configuring the virtual storage devices in the data storage device further comprises code for assigning one of the virtual hard disk drives to a high priority setting so that read and write commands to that virtual hard disk drive in the queue are executed before read and write commands to a lower priority one of the virtual hard disk drives in the queue.

14. The data storage device defined in claim 11 wherein the code for configuring the virtual storage devices in the data storage device further comprises code for causing one of the virtual hard disk drives to be part of a redundant array of independent devices.

15. The data storage device defined in claim 10 wherein the code for configuring the virtual storage devices in the data storage device further comprises code for reconfiguring the virtual storage devices by interpreting new configuration metadata received from the host operating system in the format that is not specific to a particular file system.

16. The data storage device defined in claim 10 wherein the configuration metadata is in a format that comprises a list of ordered pairs, each of the ordered pairs in the list of ordered pairs comprising a logical block address and a length, the length corresponding to a number of data sectors.

17. A method for using virtual storage devices, the method comprising:

receiving configuration metadata in a data storage device from a host operating system, the configuration metadata being in a format that is not specific to a particular file system;

configuring virtual storage devices in the data storage device by interpreting the configuration metadata, wherein the configuration metadata comprises a range of logical block addresses and a virtual storage device number for each of the virtual storage devices, and each of the virtual storage device numbers is a unique identifier used to differentiate between the virtual storage devices;

assigning each of the virtual storage devices to a subset of a non-volatile data storage capacity of the data storage device;

using the virtual storage device numbers to map logical block addresses to physical addresses associated with data sectors in the data storage device that are accessible in response to commands from first and second virtual machine operating systems;

determining a set of the physical addresses to access based on the virtual storage device numbers when the first and the second virtual machine operating systems attempt to access the same one of the logical block addresses;

accessing data sectors associated with a first one of the virtual storage devices in response to commands from the first virtual machine operating system using a first one of the virtual storage device numbers and a first set of the logical block addresses; and

accessing data sectors associated with a second one of the virtual storage devices in response to commands from the second virtual machine operating system using a second one of the virtual storage device numbers and a second set of the logical block addresses, wherein the first and the second virtual machine operating systems are part of a virtual machine.

18. The method defined in claim 17 wherein the data storage device is a hard disk drive, and the virtual storage devices are virtual hard disk drives.

19. The method defined in claim 18 further comprising:

combining read and write commands from the first and the second virtual machine operating systems into a queue in the hard disk drive, each of the read and write commands comprising both a virtual hard disk drive number and a range of logical block addresses.

20. The method defined in claim 19 further comprising:

assigning one of the virtual hard disk drives to a high priority setting to cause read and write commands to that virtual hard disk drive in the queue to be executed before read and write commands to another one of the virtual hard disk drives in the queue.