mnt_app resource failover

Hi,

Before digging into this particular configuration, lets understand relationship between “criticality of resources” and “failover of SG”.

Critical resource: Fault of resource will always initiate failover of service group.

Non-critical resource: Fault of resource will trigger failover of service group only if there is a “critical” AND “online” parent resource up in the dependency tree. Critically of child resources isn’t considered while deciding to failover or not to failover.

1^st query : If parent is set as critical and child is non-critical 0, do it failover to another node.

If critical parent resource faults, undoubtedly failover will be initiated. If critical parent resource is online and non-critical resource faults, failover will be initiated. If critical parent resource is offline and non-critical resource faults, failover will not be initiated.

2^nd query : If child is set as critical or parent as non-critical 0, then it failover?

If critical child resource faults, undoubtedly failover will be initiated. If non-critical parent resource faults, failover will not be initiated.

Based on the "hares -dep" output snippet, the resources dependency tree is like

APP_aphelion                   APP_tibjmsd                      Blind_check_stopDB

|                                              |                                              |

|                                              |                                              |

|----------------------------------------------|----------------------------------------------|

                                               |

                                           mnt_app(non-critical)

                                               |

                                               |

                                          vol_app(critical)

                                               |

                                               |

                                          app_dg(critical)

As not mentioned, we are assuming that APP_aphelion, APP_tibjmsd, and Blind_check_stopDB are critical resources.

In this configuration; fault of app_dg, vol_app, APP_aphelion, APP_tibjmsd, or Blind_check_stopDB will initiate failover of the service group. Fault of mnt_app will trigger failover ONLY IF any of APP_aphelion, APP_tibjmsd, or Blind_check_stopDB is online. In all other cases, fault of mnt_app will not trigger failover of the service group.