System and method for customizing a SCSI error response received from a SCSI target in a storage network environment

• US 8,020,031 B1
• Filed: 04/28/2010
• Issued: 09/13/2011
• Est. Priority Date: 04/28/2010
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Verma, Rakesh, Meyer, Dan, Govande, Nilesh, Thakkar, Vishal
• Primary Examiner(s): Le; Dieu-Minh
• Application Number:
  US12/768,754
• Time in Patent Office: 503 Days
• Field of Search: 714/2, 714/16, 714/11, 714/56, 714/57, 714/47.1, 714/48
• US Class Current: 714/2
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/0781 Error filtering or prioritizing based on a policy defined by the user or on a policy defined by a hardware/software module, e.g. according to a severity level

Abstract

A system and method for customizing a SCSI error response received from a SCSI target in a storage network environment is disclosed. In a method for customizing a SCSI error response received from a SCSI target in a storage network environment, a SCSI command is received from a SCSI initiator by a SCSI to ATA bridge. The received SCSI command is translated to provide an ATA command. The ATA command is then sent to an ATA drive. The ATA command is executed by the ATA drive. During execution, if an error occurs, an ATA error response is sent by the ATA drive to the SCSI to ATA bridge. The received ATA error response is translated to a SCSI error response. The SCSI to ATA bridge then obtains a customized SCSI error response using an error look-up table. Further the customized SCSI error response is sent to the SCSI initiator.

Claims

1. A method for customizing a SCSI error response received from a SCSI target in a storage network environment, comprising:

receiving a SCSI command from a SCSI initiator by a SCSI to ATA bridge;

translating the received SCSI command by the SCSI to ATA bridge to provide an ATA command;

sending the ATA command to an ATA drive by the SCSI to ATA bridge;

executing the ATA command by the ATA drive;

determining whether the ATA command was executed successfully by the ATA drive;

if not, sending an ATA error response by the ATA drive to the SCSI to ATA bridge;

translating the received ATA error response to a SCSI error response by the SCSI to ATA bridge;

obtaining a customized SCSI error response using an error look-up table by the SCSI to ATA bridge; and

sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge.

2. The method of claim 1, further comprising:

if so, sending a notification associated with the successful execution of the ATA command to the SCSI to ATA bridge by the ATA drive;

translating the notification associated with the successful execution of the ATA command by the SCSI to ATA bridge; and

sending an associated successful execution response to the SCSI initiator.

3. The method of claim 1, wherein obtaining the customized SCSI error response using the error look-up table by the SCSI to ATA bridge comprises:

determining an instance ID associated with the SCSI error response;

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

4. The method of claim 3, further comprising:

if no associated error index is found in the first error lookup table, then using a default error index to extract the customized SCSI error response from the second error lookup table.

5. The method of claim 1, wherein translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command comprises:

determining whether the received SCSI command has any errors by the SCSI to ATA bridge;

if so, using the error lookup table to obtain a customized SCSI error response by the SCSI to ATA bridge and sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge; and

If not, translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command.

6. The method of claim 5, further comprising:

performing an error recovery operation based on the received customized SCSI error response by the SCSI initiator.

7. The method of claim 5, wherein translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command comprises:

determining whether the received SCSI command can be translated to the ATA command by the SCSI to ATA bridge;

if so, translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command and sending the ATA command to the ATA drive by the SCSI to ATA bridge; and

if not, then, executing the received SCSI command on the SCSI to ATA bridge and if the execution fails, obtaining a customized SCSI error response by the SCSI to ATA bridge using the error lookup table and sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge.

8. A non-transitory computer-readable storage medium for customizing a SCSI error response received from a SCSI target in a storage network environment having instructions that, when executed by a computing device, cause the computing device to perform a method comprising:

receiving a SCSI command from a SCSI initiator by a SCSI to ATA bridge;

translating the received SCSI command by the SCSI to ATA bridge to provide an ATA command;

sending the ATA command to an ATA drive by the SCSI to ATA bridge;

executing the ATA command by the ATA drive;

determining whether the ATA command was executed successfully by the ATA drive;

if not, sending an ATA error response by the ATA drive to the SCSI to ATA bridge;

translating the received ATA error response to a SCSI error response by the SCSI to SCSI to ATA bridge;

obtaining a customized SCSI error response using an error look-up table by the SCSI to ATA bridge; and

sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge.

9. The non-transitory computer-readable storage medium of claim 8, further comprising:

if so, sending a notification associated with the successful execution of the ATA command to the SCSI to ATA bridge by the ATA drive;

translating the notification associated with the successful execution of the ATA command by the SCSI to ATA bridge; and

sending an associated successful execution response to the SCSI initiator.

10. The non-transitory computer-readable storage medium of claim 8, wherein obtaining the customized SCSI error response using a look-up table by the SCSI to ATA bridge comprises:

determining an instance ID associated with the SCSI error response;

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

11. The non-transitory computer-readable storage medium of claim 10, further comprising:

if no associated error index is found in the first error lookup table, then using a default error index to extract the customized SCSI error response from the second error lookup table.

12. The non-transitory computer-readable storage medium of claim 8, wherein translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command comprises:

determining whether the received SCSI command has any errors by the SCSI to ATA bridge;

if so, using an error lookup table to obtain a customized SCSI error response by the SCSI to ATA bridge and sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge; and

If not, translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command.

13. The non-transitory computer-readable storage medium of claim 12, further comprising:

performing an error recovery operation based on the received customized SCSI error response by the SCSI initiator.

14. The non-transitory computer-readable storage medium of claim 12, wherein translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command comprises:

determining whether the received SCSI command can be translated to the ATA command by the SCSI to ATA bridge;

if so, translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command and sending the ATA command to the ATA drive by the SCSI to ATA bridge; and

if not, then, executing the received SCSI command on the SCSI to ATA bridge and if the execution fails, obtaining a customized SCSI error response by the SCSI to ATA bridge using the error lookup table and sending the customized SCSI error response to the SCSI initiator by the SCSI to ATA bridge.

15. A system for customizing a SCSI error response received from a SCSI target in a storage network environment, comprising:

one or more SCSI initiators;

an ATA drive;

a SCSI to ATA bridge coupled between the one or more SCSI initiators and the ATA drive, wherein the SCSI to ATA bridge comprises;

memory operatively coupled to the SCSI to ATA bridge, wherein the memory includes a command processing module and an error lookup table, and wherein the command processing module includes a command translation module and an instance ID generator, having instructions capable of;

receiving a SCSI command from one of the one or more SCSI initiators by the command processing module;

translating the received SCSI command by the command translating module to provide an ATA command;

sending the ATA command to the ATA drive by the command processing module;

executing the ATA command by the ATA drive;

determining whether the ATA command was executed successfully by the ATA drive;

if not, sending an ATA error response by the ATA drive to the command processing module;

translating the received ATA error response to a SCSI error response by the command processing module;

obtaining a customized SCSI error response using the error look-up table by the command translating module; and

sending the customized SCSI error response to the SCSI initiator by the command processing module.

16. The system of claim 15, further comprising the command processing module having instructions capable of:

if so, sending a notification associated with the successful execution of the ATA command to the command processing module;

translating the notification associated with the successful execution of the ATA command by the command processing module; and

sending an associated successful execution response to the SCSI initiator.

17. The system of claim 15, wherein the command processing module has instructions capable of obtaining the customized SCSI error response using the error look-up table comprising:

determining an instance ID associated with the SCSI error response using the instance ID generator;

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

18. The method of claim 17, further comprising the command processing module having instructions capable of:

using a default error index to extract the customized SCSI error response from the second error lookup table if no associated error index is found in the first error lookup table.

19. The system of claim 15, wherein the command processing module has instructions capable of translating the received SCSI command to provide the ATA command comprising:

determining whether the received SCSI command has any errors;

if so, using an error lookup table to obtain a customized SCSI error response and sending the error response to the SCSI initiator; and

if not, translating the received SCSI command to provide the ATA command.

20. The system of claim 19, further comprising the command processing module having instructions capable of:

performing an error recovery operation based on the received customized SCSI error response by the SCSI initiator.

21. The system of claim 15, wherein the command processing module has instructions capable of translating the received SCSI command to provide the ATA command comprising:

determining whether the received SCSI command can be translated to the ATA command;

if so, translating the received SCSI command to provide the ATA command and sending the ATA command to the ATA drive; and

if not, then, executing the received SCSI command and if the execution fails, obtaining a customized SCSI error response using the error lookup table and sending the customized SCSI error response to the SCSI initiator.

22. A system for customizing a SCSI error response received from a SCSI target in a storage network environment, comprising:

one or more SCSI initiators;

one or more ATA drives;

a host bus adapter (HBA) controller coupled between the one or more SCSI initiators and the one or more ATA drives, wherein the HBA controller comprises;

memory operatively coupled to the HBA controller, wherein the memory includes a SCSI to ATA translation (SAT) module, wherein the SAT module includes a command processing module and an error lookup table, and wherein the command processing module includes a command translation module and an instance ID generator, having instructions capable of;

receiving a SCSI command from one of the one or more SCSI initiators by the command processing module;

translating the received SCSI command by the command translating module to provide an ATA command;

sending the ATA command to one of the one or more ATA drives by the command processing module;

executing the ATA command by the one of the one or more ATA drives;

determining whether the ATA command was executed successfully by the one of the one or more ATA drives;

if not, sending an ATA error response by the one of the one or more ATA drives to the command processing module;

translating the received ATA error response to a SCSI error response by the command processing module;

obtaining a customized SCSI error response using the error look-up table by the command translating module; and

sending the customized SCSI error response to the one of the one or more SCSI initiators by the command processing module.

23. The system of claim 22, further comprising the command processing module having instructions capable of:

if so, sending a notification associated with the successful execution of the ATA command;

translating the notification associated with the successful execution of the ATA command; and

sending an associated successful execution response to the SCSI initiator.

24. The system of claim 22, wherein the command processing module has instructions capable of obtaining the customized SCSI error response using the error look-up table comprising:

determining an instance ID associated with the SCSI error response using the instance ID generator;

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

25. The system of claim 24, further comprising the command processing module having instructions capable of:

using a default error index to extract the customized SCSI error response from the second error lookup table if no associated error index is found in the first error lookup table.

26. The system of claim 22, wherein the command processing module has instructions capable of translating the received SCSI command to provide the ATA command comprising:

determining whether the received SCSI command has any errors;

if so, using an error lookup table to obtain a customized SCSI error response and sending the error response to the SCSI initiator; and

If not, translating the received SCSI command by the SCSI to ATA bridge to provide the ATA command.

27. The system of claim 26, further comprising the command processing module having instructions capable of:

performing an error recovery operation based on the received customized SCSI error response by the SCSI initiator.

28. The system of claim 22, wherein the command processing module has instructions capable of translating the received SCSI command to provide the ATA command comprising:

determining whether the received SCSI command can be translated to the ATA command;

if so, translating the received SCSI command to provide the ATA command and sending the ATA command to the one of the one or more ATA drives; and

if not, then, executing the received SCSI command and if the execution fails, obtaining a customized SCSI error response using the error lookup table and sending the customized SCSI error response to the SCSI initiator.

29. A system for customizing a SCSI error response received from a SCSI target in a storage network environment, comprising:

one or more SCSI initiators;

a SCSI drive coupled to the one or more SCSI initiators, wherein the SCSI drive includes memory, wherein the memory is operatively coupled to the SCSI drive, wherein the memory includes a command processing module and an error lookup table, and wherein the command processing module includes a command translation module and an instance ID generator, having instructions capable of;

receiving a SCSI command from one of the one or more SCSI initiators by the command processing module;

executing the SCSI command by the SCSI drive;

determining whether the SCSI command was executed successfully by the SCSI drive;

if not, generating a SCSI error response by the SCSI drive;

obtaining a customized SCSI error response using the error look-up table by the command processing module; and

sending the customized SCSI error response to the one of the one or more SCSI initiators by the command processing module.

30. The system of claim 29, further comprising the command processing module having instructions capable of:

if so, sending a successful execution response to the one of the one or more SCSI initiators.

31. The system of claim 29, wherein the command processing module has instructions capable of obtaining the customized SCSI error response comprising:

determining an instance ID associated with the SCSI error response using the instance ID generator;

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

32. The method of claim 31, further comprising the command processing module having instructions capable of:

using a default error index to extract the customized SCSI error response from the second error lookup table if no associated error index is found in the first error lookup table.

33. The system of claim 32, further comprising the command processing module having instructions capable of:

performing an error recovery operation based on the received customized SCSI error response by the one of the one or more SCSI initiators.

34. A system for customizing a SCSI error response received from a SCSI target in a storage network environment, comprising:

one or more SCSI initiators;

a SCSI enclosure coupled to the one or more SCSI initiators, wherein the SCSI enclosure includes memory, wherein the memory is operatively coupled to the SCSI enclosure, wherein the memory includes a command processing module and an error lookup table, wherein the command processing module includes a command translation module and an instance ID generator, having instructions capable of;

receiving a SCSI command from one of the one or more SCSI initiators by the command processing module;

executing the SCSI command by the SCSI enclosure;

determining whether the SCSI command was executed successfully by the SCSI enclosure;

if not, generating a SCSI error response by the SCSI enclosure;

obtaining a customized SCSI error response using the error look-up table by the command processing module; and

sending the customized SCSI error response to the one of the one or more SCSI initiators by the command processing module.

35. The system of claim 34, further comprising the command processing module having instructions capable of:

if so, sending a successful execution response to the one of the one or more SCSI initiators.

36. The system of claim 34, wherein the command processing module has instructions capable of obtaining the customized SCSI error response using an error look-up table comprising:

determining an instance ID associated with the SCSI error response using the instance ID generator

determining an error index associated with the determined instance ID using a first error lookup table; and

extracting the customized SCSI error response associated with the determined error index using a second error lookup table.

37. The method of claim 36, further comprising the command processing module having instructions capable of:

using a default error index to extract the customized error information from the second error lookup table if no associated error index is found in the first lookup table.

38. The system of claim 37, further comprising the command processing module having instructions capable of:

performing an error recovery operation based on the received customized SCSI error response by the SCSI initiator.