Modification indication implementation based on internal model

• US 9,652,434 B1
• Filed: 12/13/2013
• Issued: 05/16/2017
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: EMC Corporation (Dell Technologies Inc.)
• Inventors: Zhao, Yue, Chen, Jeegn, Pendergraft, James O., Speciner, Norman D.
• Primary Examiner(s): Hussain, Tauqir
• Assistant Examiner(s): Keller, Michael A
• Application Number:
  US14/105,567
• Time in Patent Office: 1,250 Days
• CPC Class Codes: G06F 15/17331 Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]
• CPC Class Codes: H04L 67/1097 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]
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

The subject disclosure is generally directed towards caching property values in a sparse cache for use in translating notifications to contain previous and source property values, e.g., for use in SMI-S compliant notifications (modification indications). When a modification indication that needs a previous instance and source instance, but only the source instance is available, a cache is accessed to obtain the previous property value. The modification indication is translated to contain the previous and source instance, and output, e.g., to a client subscriber. The cache is updated with the property values of the source instance in anticipation of being needed for a subsequent modification indication of that property.

Claims

1. A computer-implemented method executed by one or more processors, the method comprising:

populating a cache on a system memory with one or more initial source property values corresponding to a modification indication filter on at least one property of an object, by a pre-populate query logic component of a computing device;

receiving, from a server, a modification indication of a change to the at least one property, the modification indication comprising one or more current source property values associated with the object, the one or more initial source property values further comprises one or more previous property values of the object before the change, wherein the one or more previous property values is an operational status;

accessing the one or more previous property values from the cache, by the computing device;

translating the modification indication into a Storage Management Initiative Specification (SMI-S) compliant translated modification indication, by the one or more processors, the translated modification indication comprising the one or more previous property values and the one or more current source property values; and

sending the translated modification indication to a remote computing device associated with a client, by the computing device, to notify the client of the change associated with the modification indication filter.

2. The computer-implemented method of claim 1 wherein the one or more previous property values is a first previous property value set, wherein the modification indication is a first modification indication;

and further comprising;

populating the cache with the one or more current source property values, wherein the one or more current source property values are cached for use if another change occurs;

receiving a second modification indication of a second change to the at least one property, the second modification indication comprising one or more new current source property values associated with the object, wherein the one or more current source property values is a second previous property value set for the object;

reading the second previous property value set from the cache; and

translating the second modification indication into a second SMI-S compliant translated modification indication comprising the one or more new current source property values and the second previous property value set.

3. The computer-implemented method of claim 1 further comprising:

determining whether the change is a change of interest to the client; and

performing the translation of the modification indication if the change is of interest, wherein the modification indication is not translated if the change is not of interest to the client.

4. The computer-implemented method of claim 1, wherein outputting the modification indication further comprises:

sending the translated modification indication to a plurality of client subscribers.

5. The computer-implemented method of claim 1 further comprising:

populating the cache with the one or more initial source property values, including the one or more previous property values, during system startup.

6. The computer-implemented method of claim 1, wherein populating the cache with the one or more initial source property values as the one or more previous property values further comprises:

querying the server for the one or more initial source property values, by pre-populate query logic on the computing device.

7. The computer-implemented method of claim 1 further comprising:

sending the translated modification indication when operational status of a storage volume changes.

8. The computer-implemented method of claim 1, wherein receiving the modification indication comprises communicating with a UI services layer.

9. A system comprising:

a memory, the memory storing modification implementation logic, the modification implementation logic comprising modification indication handling logic;

a system bus coupling the memory to one or more processors;

the one or more processors executing the modification implementation logic to translate a modification indication received from a server, the modification indication comprising a source property value associated with an object, the modification indication corresponding to a change in a property of the object corresponding to a modification indication filter, the modification indication handling logic further configured to read a first previous property value from a sparse cache on the memory, wherein the previous property value is an operational status, translate the modification indication into a Storage Management Initiate Specification (SMI-S) compliant translated modification indication to notify a client of the change associated with the modification indication filter, and update the sparse cache with the source property value, the cached source property value is a second previous property value for use in an event of a subsequent change, the translated modification Indication comprising the first previous property value and the source property value.

10. The system of claim 9, the modification indication handling logic further configured to send the translated modification indication to a remote computing device associated with the client to notify the client of the change associated with the modification indication filter.

11. The system of claim 9, wherein an SMI-S API layer receives the modification indication from the server via a user interface (UI) services layer.

12. The system of claim 9, wherein an SMI-S API layer is configured to send the translated modification indication to the client, wherein the one or more processors further executes the modification implementation logic to determine whether the change is a change of interest to the client and perform the translation of the modification indication if the change is of interest to the client, wherein the modification indication is not translated if the change is not of interest to the client.

13. The system of claim 9, wherein the source property value corresponds to at least one of:

CIM_StoragePool;

;

TotalManagedSpace,

CIM_ComputerSystem;

;

OperationalStatus,

CIM_RedundancySet;

;

RedundancyStatus,

CIM_StoragePool;

;

TotalManagedSpace,

CIM_StorageVolume;

;

OperationalStatus,

CIM_LogicalDisk;

;

OperationalStatus,

CIM_FCPort;

;

OperationalStatus,

CIM_LogicalDevice;

;

HealthState,

CIM_ConcreteJob;

;

PercentComplete,

CIM_ConcreteJob;

;

OperationalStatus, or

CIM_ConcreteJob;

;

JobState.

14. The system of claim 9, wherein the one or more processors further executes the modification implementation logic to query the server for one or more initial property values and pre-populate the sparse cache with the one or more initial property values.

15. The system of claim 9, wherein the one or more processors further executes the modification implementation logic to update the sparse cache based upon instance creation or instance deletion.

16. The system of claim 9, wherein the modification indication is a first modification indication and the source property value is a first source property value, and wherein the one or more processors further executes the modification implementation logic to translate a second modification indication comprising a second source property value associated with the object, the modification indication handling logic further configured to read the second previous property value from the sparse cache, translate the second modification indication into a second translated modification indication comprising the second previous property value and the second source property value.

17. One or more machine-readable storage devices comprising computer executable components, said components comprising a modification implementation logic component that, when executed, cause at least one processor to:

populate a cache associated with a first computing device with one or more initial source property values corresponding to a modification indication filter associated with a property of an object;

receive a modification indication of a change to the property of the object, the modification indication comprising a source instance associated with the object, the one or more initial source property values comprising a first previous property value of the object before the change, wherein the previous property value is an operational status;

read the first previous property value corresponding to the source instance from the cache;

on determining a translation of the modification indication is to be performed,

(i) translate the modification indication into a Storage Management Initiative Specification (SMI-S) compliant translated modification indication comprising the first previous property value;

(ii) update cached data to contain the source property value, the cached source property value is a second previous property value for use in an event of a subsequent change; and

(iii) output the translated modification indication to a second computing device associated with a client to notify the client of the change associated with the modification indication filter.

18. The one or more machine-readable storage devices of claim 17 wherein the modification implementation logic is further executed to cause the at least one processor to:

determine whether the change is a change of interest to the client and perform the translation of the modification indication if the change is of interest to the client, wherein the modification indication is not translated if the change is not of interest to the client.

19. The one or more machine-readable storage devices of claim 17 wherein the modification implementation logic is further executed to cause the at least one processor to:

populate the cache with one or more source property values based upon an instance creation in anticipation of a future modification; and

remove data from the cache based upon an instance deletion.

20. The one or more machine-readable storage devices of claim 17 wherein the modification implementation logic is further executed to cause the at least one processor to:

output a non-translated modification indication upon determining that a previous property value is not needed for the modification indication.