Cloud storage write cache management system and method

Patent metadata

Field	Value
Publication number	US-2017371752-A1
Application number	US-201715447880-A
Country	US
Kind code	A1
Filing date	Mar 2, 2017
Priority date	Jun 22, 2016
Publication date	Dec 28, 2017
Grant date	—

Abstract

A method, computer program product, and computer system for monitoring health of at least one storage device of a cache in a clustered system. A recovery journal may be maintained, wherein the recovery journal may identify whether one or more chunks of data stored in the cache have been dumped from the at least one storage device to persistent storage in the clustered system. A state of the at least one storage device may be determined based upon, at least in part, the health of the at least one storage device. A recovery action may be performed on the one or more chunks of data stored in the at least one storage device based upon, at least in part, the state of the at least one storage device.

First claim

What is claimed is:

1 . A computer-implemented method comprising:
monitoring health of at least one storage device of a cache in a clustered system; maintaining a recovery journal, wherein the recovery journal identifies whether one or more chunks of data stored in the cache have been dumped from the at least one storage device to persistent storage in the clustered system; determining a state of the at least one storage device based upon, at least in part, the health of the at least one storage device; and performing a recovery action on the one or more chunks of data stored in the at least one storage device based upon, at least in part, the state of the at least one storage device.

2 . The computer-implemented method of claim 1 wherein the state of the at least one storage device is determined to be a first state if at least one I/O request directed to the at least one storage device fails.

3 . The computer-implemented method of claim 2 wherein the recovery action includes attempting to dump each of the one or more chunks of data stored in the at least one storage device to the persistent storage if the state of the at least one storage device is the first state, wherein each chunk of data successfully dumped is removed from the recovery journal.

4 . The computer-implemented method of claim 3 wherein the recovery action further includes recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

5 . The computer-implemented method of claim 1 wherein the state of the at least one storage device is determined to be a second state if the at least one storage device is incapable of completing I/O requests.

6 . The computer-implemented method of claim 5 wherein the recovery action further includes:
invalidating at least a portion of the one or more chunks of data stored in the at least one storage device if the state of the at least one storage device is the second state; and
recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

7 . The computer-implemented method of claim 1 wherein the recovery action includes restoring the recovery journal from a file system on the at least one storage device if the recovery journal is one of corrupted and lost.

8 . A computer program product residing on a computer readable storage medium having a plurality of instructions stored thereon which, when executed across one or more processors, cause at least a portion of the one or more processor to perform operations comprising:
monitoring health of at least one storage device of a cache in a clustered system; maintaining a recovery journal, wherein the recovery journal identifies whether one or more chunks of data stored in the cache have been dumped from the at least one storage device to persistent storage in the clustered system; determining a state of the at least one storage device based upon, at least in part, the health of the at least one storage device; and performing a recovery action on the one or more chunks of data stored in the at least one storage device based upon, at least in part, the state of the at least one storage device.

9 . The computer program product of claim 8 wherein the state of the at least one storage device is determined to be a first state if at least one I/O request directed to the at least one storage device fails.

10 . The computer program product of claim 9 wherein the recovery action includes attempting to dump each of the one or more chunks of data stored in the at least one storage device to the persistent storage if the state of the at least one storage device is the first state, wherein each chunk of data successfully dumped is removed from the recovery journal.

11 . The computer program product of claim 10 wherein the recovery action further includes recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

12 . The computer program product of claim 8 wherein the state of the at least one storage device is determined to be a second state if the at least one storage device is incapable of completing I/O requests.

13 . The computer program product of claim 12 wherein the recovery action further includes:
invalidating at least a portion of the one or more chunks of data stored in the at least one storage device if the state of the at least one storage device is the second state; and
recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

14 . The computer program product of claim 8 wherein the recovery action includes restoring the recovery journal from a file system on the at least one storage device if the recovery journal is one of corrupted and lost.

15 . A computing system including one or more processors and one or more memories configured to perform operations comprising:
monitoring health of at least one storage device of a cache in a clustered system; maintaining a recovery journal, wherein the recovery journal identifies whether one or more chunks of data stored in the cache have been dumped from the at least one storage device to persistent storage in the clustered system; determining a state of the at least one storage device based upon, at least in part, the health of the at least one storage device; and performing a recovery action on the one or more chunks of data stored in the at least one storage device based upon, at least in part, the state of the at least one storage device.

16 . The computer program product of claim 15 wherein the state of the at least one storage device is determined to be a first state if at least one I/O request directed to the at least one storage device fails.

17 . The computer program product of claim 16 wherein the recovery action includes attempting to dump each of the one or more chunks of data stored in the at least one storage device to the persistent storage if the state of the at least one storage device is the first state, wherein each chunk of data successfully dumped is removed from the recovery journal.

18 . The computer program product of claim 17 wherein the recovery action further includes recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

19 . The computer program product of claim 15 wherein the state of the at least one storage device is determined to be a second state if the at least one storage device is incapable of completing I/O requests.

20 . The computer program product of claim 19 wherein the recovery action further includes:
invalidating at least a portion of the one or more chunks of data stored in the at least one storage device if the state of the at least one storage device is the second state; and
recovering at least a portion of the one or more chunks of data that remain in the recovery journal.

21 . The computer program product of claim 15 wherein the recovery action includes restoring the recovery journal from a file system on the at least one storage device if the recovery journal is one of corrupted and lost.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Danilov Mikhail
• Fomin Andrey
• Malygin Mikhail
• Prikhodko Vladimir
• Rakulenko Alexander
• Trusov Maxim

Classifications

• G06F2201/885

  Monitoring specific for caches · CPC title

• G06F11/1471 Primary

  involving logging of persistent data for recovery · CPC title

• G06F11/3034

  where the computing system component is a storage system, e.g. DASD based or network based (digital input from or digital output to record carriers G06F3/06; digital recording or reproducing 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 title

• G06F2201/82

  Solving problems relating to consistency · CPC title

• G06F2201/805

  Real-time · CPC title