VCS goes through the following steps when an online resource faults:

• VCS first verifies the Monitor routine completes successfully in the required time. If it does, VCS examines the exit code returned by the Monitor routine. If the Monitor routine does not complete in the required time, VCS looks at the FaultOnMonitorTimeouts (FOMT) attribute.

• If FOMT=0, the resource will not fault when the Monitor routine times out. VCS considers the resource online and monitors the resource periodically, depending on the monitor interval.

  If FOMT=1 or more, VCS compares the CurrentMonitorTimeoutCount (CMTC) with the FOMT value. If the monitor timeout count is not used up, CMTC is incremented and VCS monitors the resource in the next cycle.

• If FOMT= CMTC, this means that the available monitor timeout count is exhausted and VCS must now take corrective action. VCS checks the Frozen attribute for the service group. If the service group is frozen, VCS declares the resource faulted and calls the resfault trigger. No further action is taken.

• If the service group is not frozen, VCS checks the ManageFaults attribute for the service group. If the ManageFaults attribute is set to NONE, VCS marks the resource as ONLINE|ADMIN_WAIT and fires the resadminwait trigger. If the ManageFaults attribute is set to ALL, VCS invokes the Clean function with the reason Monitor Hung.

• If the Clean function is successful (that is, Clean exit code = 0), VCS examines the value of the RestartLimit attribute. If Clean fails (exit code = 1), the resource remains online with the state UNABLE TO OFFLINE. VCS fires the resnotoff trigger and monitors the resource again.

• If the Monitor routine does not time out, it returns the status of the resource as being online or offline.

• If the ToleranceLimit (TL) attribute is set to a non-zero value, the Monitor cycle returns offline (exit code = 100) for a number of times specified by the ToleranceLimit and increments the ToleranceCount (TC). When the ToleranceCount equals the ToleranceLimit (TC = TL), the agent declares the resource as faulted.

• If the Monitor routine returns online (exit code = 110) during a monitor cycle, the agent takes no further action. The ToleranceCount attribute is reset to 0 when the resource is online for a period of time specified by the ConfInterval attribute.

  If the resource is detected as being offline a number of times specified by the ToleranceLimit before the ToleranceCount is reset (TC = TL), the resource is considered faulted.

• After the agent determines the resource is not online, VCS checks the Frozen attribute for the service group. If the service group is frozen, VCS declares the resource faulted and calls the resfault trigger. No further action is taken.

• If the service group is not frozen, VCS checks the ManageFaults attribute. If ManageFaults=NONE, VCS marks the resource state as ONLINE|ADMIN_WAIT and calls the resadminwait trigger. If ManageFaults=ALL, VCS calls the Clean function with the CleanReason set to Unexpected Offline.

• If the Clean function fails (exit code = 1) the resource remains online with the state UNABLE TO OFFLINE. VCS fires the resnotoff trigger and monitors the resource again. The resource enters a cycle of alternating Monitor and Clean functions until the Clean function succeeds or a user intervenes.

• If the Clean function is successful, VCS examines the value of the RestartLimit (RL) attribute. If the attribute is set to a non-zero value, VCS increments the RestartCount (RC) attribute and invokes the Online function. This continues till the value of the RestartLimit equals that of the RestartCount. At this point, VCS attempts to monitor the resource.

• If the Monitor returns an online status, VCS considers the resource online and resumes periodic monitoring. If the monitor returns an offline status, the resource is faulted and VCS takes actions based on the service group configuration.