Method and system for reporting the status of an aggregate resource residing in a network of interconnected real resources

• US 5,535,335 A
• Filed: 05/05/1995
• Issued: 07/09/1996
• Est. Priority Date: 12/22/1992
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: Lawton, Craig M., Whitfield, John P., Linton, John F., Gottschalk, Karl D., Cox, David E.
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): HOMERE, JEAN RAYMOND
• Application Number:
  US08/435,558
• Time in Patent Office: 431 Days
• Field of Search: 395/839, 395/837, 395/835, 395/838, 395/200.13, 395/600, 364/DIG. 1
• US Class Current: 709/221
• CPC Class Codes: G06F 11/3006 where the computing system is distributed, e.g. networked systems, clusters, multiprocessor systems multiprogramming arrangements G06F9/46; allocation of resources G06F9/50
• CPC Class Codes: G06F 11/3055 Monitoring arrangements for monitoring the status of the computing system or of the computing system component, e.g. monitoring if the computing system is on, off, available, not available error or fault processing without redundancy G06F11/0703; error detection or correction by redundancy in data representation G06F11/08; error detection or correction by redundancy in operation G06F11/14; error detection or correction by redundancy in hardware G06F11/16
• CPC Class Codes: G06F 11/3082 the data filtering being achieved by aggregating or compressing the monitored data
• CPC Class Codes: H04L 43/02 Capturing of monitoring data
• CPC Class Codes: H04L 43/0805 by checking availability

Abstract

In a network composed of communicating resources, the status of an aggregate resource may be determined by calculations based upon the status assumed by the real resources contained within the aggregate rather than being determined directly. The status of real resources may be propagated to still higher aggregate resources whose own status is based upon the status of the real resources contained within it. An aggregate resource may have multiple potential statuses and a decision as to which status to report for an aggregate resource at a given time is calculated based upon the status of the underlying real resources which it contains. Each real resource has associated with it another parameter which is its aggregation priority value indicating to what degree a change in its status will affect higher level nodes or aggregates in a network hierarchy. In assigning a new aggregate status to a given aggregate resource, the calculation for aggregate status determines the status of the real underlying resources that are descendents of the aggregate resource, retrieves the appropriate threshold levels for status change for the aggregate, and checks the aggregation priority of the real resources that are descendents of the aggregate and are currently in an unsatisfactory state and then assigns a new aggregate resource status.

Claims

1. A computer implemented method for determining the operational status of an aggregate resource residing in a network of interconnected real resources, said aggregate resource being defined as a logical resource including a plurality of real resources and represented by a configuration record stored in a database wherein said configuration record contains a list of said real resources and a current operational status and an aggregation priority value for each said real resource and further contains a plurality of predefined parameter values that are used to determine the operational status of said aggregate resource, said method being executed by a monitoring computer and comprising the steps of:

determining from said configuration record the number of real resources contained within said aggregate resource and having an operational status of a first type;

comparing said number of real resources having the operational status of said first type with said plurality of predefined parameter values and assigning said aggregate resource an operational status corresponding to the largest of said predefined parameter values that is equalled or exceeded by said number of real resources having the operational status of said first type; and

if said number of real resources having the operational status of said first type is less than the smallest of said predefined parameter values, determining if any of said real resources having the operational status of said first type also has a non-zero aggregation priority value, such that;

for each said real resource having the operational status of said first type and said non-zero aggregation priority value, determining if the operational status of said real resource should be assigned as said operational status of said aggregate resource;

if the operational status of any of each said real resource should be assigned as the operational status of said aggregate resource, assigning said operational status of said real resource to said operational status of said aggregate resource; and

if the status of each said real resource should not be reflected in said operational status of said aggregate resource, assigning said aggregate resource an operational status of satisfactory.

2. The method as claimed in claim 1 further comprising the steps of:

determining from said configuration record the number of said real resources contained within said aggregate resource and the number of said real resources having the operational status of a second type;

calculating a ratio of the number of said real resources having the operational status of said second type to the number of real resources contained within said aggregate resource;

retrieving a threshold value from said configuration record and comparing said threshold value to said calculated ratio; and

if said calculated ratio exceeds said threshold value, assigning the operational status of said second type to said aggregate resource.

3. The method as claimed in claim 1 wherein said aggregate resource includes a plurality of other aggregate resources with each of said other aggregate resources including a plurality of real resources, said step of determining if the operational status of said real resource should be assigned as said operational status of said aggregate resource includes:

arranging said plurality of other aggregate resources and said plurality of real resources in a hierarchical structure and assigning a sequential level number to each level in said hierarchical structure, said aggregate resource being assigned the highest sequential level number;

propagating said operational status of said real resource upwards a number of levels in said hierarchical structure corresponding to said aggregation priority value of said real resource.

4. The method as claimed in either of claim 1 or 2 further comprising the step of recording said operational status of said aggregate resource in said configuration record.

5. A computer system for determining the operational status of an aggregate resource residing in a network of interconnected real resources, said aggregate resource being defined as a logical resource including a plurality of real resources and represented by a configuration record stored in a database wherein said configuration record contains a list of said real resources and a current operational status and an aggregation priority value for each said real resource and further contains a plurality of predefined parameter values that are used to determine the operational status of said aggregate resurce, said system comprising:

means for determining from said configuration record the number of real resources contained within said aggregate resource and having an operational status of a first type;

means for comparing said number of real resources having the operational status of said first type with said plurality of predefined parameter values and assigning said aggregate resource an operational status corrsponding to the largest of said predefined parameter values that is equalled or exceeded by said number of real resources having the operational status of said first type; and

,

if said number of real resources having the operational status of said first type is less than the smallest of said predefined parameter values;

means for determining if any of said real resources having the operational status of said first type also have a non-zero aggregation priority value;

for each said real resource having the operational status of said first type and said non-zero aggregation priority value, means for determining if the operational status of said real resource should be assigned as said operational status of said aggregate resource;

means for assigning said operational status of said real resource to said operational status of said aggregate resource if the operational status of any of each said real resource should be assigned as the operational status of said aggregate resource; and

,

means for assigning said aggregate resource an operational status of satisfactory if the status of each said real resource should not be reflected in said operational status of said aggregate resource.

6. The system as claimed in claim 5 further comprising:

means for determining from said configuration record the number of said real resources contained within said aggregate resource and the number of said real resources having the operational status of a second type;

means for calculating a ratio of the number of said real resources having the operational status of said second type to the number of real resources contained within said aggregate resource;

means for retrieving a threshold value from said configuration record and comparing said threshold value to said calculated ratio; and

,

means for assigning the operational status of said second type to said aggregate resource if said calculated ratio exceeds said threshold value.

7. The system as claimed in claim 5 wherein said aggregate resource includes a plurality of other aggregate resources with each of said other aggregate resources including a plurality of real resources, said means for determining if the operational status of said real resource should be assigned as said operational status of said aggregate resource including:

means for arranging said plurality of other aggregate resources and said plurality of real resources in a hierarchical structure and assigning a sequential level number to each level in said hierarchical structure, said aggregate resource being assigned the highest sequential level number; and

,

means for propagating said operational status of said real resource upwards a number of levels in said hierarchical structure corresponding to said aggregation priority value of said real resource.

8. The system as claimed in either of claims 5 or 6 further comprising means for recording said operational status of said aggregate resource in said configuration record.