Granted Patent B1

US 6,986,076 · App. 10/156,486 · Granted Jan 10, 2006

Abstract

Claims (36)

1. In a computer system including at least two server nodes, each of which can execute clustered server software, a method for monitoring failure situations to reduce downtime, said method comprising the steps of:

(a) detecting an event causing one of said failure situations;

(b) determining if said event affects one of said server nodes, and if so;

(c) determining if said event exceeds a threshold value, and if so;

(d) executing a proactive failover;

(e) determining if said event does not affect one of said server nodes, and if so;

(f) determining if said event affects the condition of the cluster service, and if so;

(g) identifying and initiating an appropriate action to fix said condition or provide a workaround that will preempt an impending failure of the cluster system, or restart a failed cluster system.

2. The method as in claim 1 wherein said threshold value is selected by a user to represent unacceptable server conditions.

3. The method as in claim 1 wherein said step (a) of detecting said event includes the steps of:

(a1) listening for an SNMP event;

(a2) listening for an event log event.

4. The method as in claim 3 wherein said step (a1) of listening for said SNMP event includes the steps of:

(a1a) determining if SNMP service software is installed, and if so;

(a1b) determining if SNMP agent software is installed, and if so;

(a1c) initiating a thread to receive and process SNMP traps.

5. The method as in claim 4 wherein it is determined in step (a1a) that said SNMP service software is not installed, then further comprising the step of:

(a1a1) creating a notification to install said SNMP service software.

6. The method as in claim 4 wherein it is determined in step (a1b) that said SNMP agent software is not installed, then further comprising the step of:

(a2b1) creating a notification to install said SNMP agent software.

7. In a computer system including at least two server nodes, each of which can execute clustered server software, a method for monitoring failure situations to reduce downtime, said method comprising the steps of:

(a) detecting an event causing one of said failure situations said detecting including the steps of:

(a1) listening for a Simple Network Management Protocol (SNMP) event;

(a2) listening for an event log event; wherein said step (a2) for listening for said event log event further includes the steps of:

(a2a) opening a connection to a Windows Management Instrumentation (WMI) service;

(a2b) subscribing to receive event log messages from said WMI service;

(b) determining if said event affects one of said server nodes, and if so;

(c) determining if said event exceeds a threshold value, and if so;

(d) executing a proactive failover.

8. The method as in claim 7 wherein said step (c), of determining if said event exceeds a threshold value, further includes the steps of:

(c1) ensuring said node affected by said event owns a cluster group;

(c2) ensuring there is a remaining node to failover to;

(c3) ensuring said remaining node is clear of critical events.

9. The method as in claim 7 wherein said step (d) of executing a proactive failover includes the steps of:

(d1) initiating a failover process for each cluster group in an offline state;

(d2) logging the result for each of said failover processes.

Assignments (11)