6.1.4 Status after failover
This subsection explains the monitoring status after failover that occurred when ITSLM was monitoring or detecting monitored services.
- Organization of this subsection
(1) Status of monitoring of monitored services before and after failover
If failover occurs while ITSLM is monitoring monitored services, the monitoring continues.
The following table shows the status of monitoring of monitored services before and after failover.
|
No. |
Monitoring status before failover |
Monitoring status after failover |
|
|---|---|---|---|
|
Failover that occurs on ITSLM - Manager |
Failover that occurs on ITSLM - UR |
||
|
1 |
Start |
Start |
Start |
|
2 |
Stop |
Stop |
Stop |
|
3 |
Starting |
Stop#1 |
|
|
4 |
Stopping |
Start |
Start#2 |
- #1
-
If failover of ITSLM - UR is completed before a monitoring start instruction is sent from ITSLM - Manager to ITSLM - UR since the user initiated monitoring start processing, the monitoring start processing continues.
- #2
-
If failover of ITSLM - UR is completed before a monitoring stop instruction is sent from ITSLM - Manager to ITSLM - UR since the user initiated monitoring stop processing, the monitoring stop processing continues.
If failover occurs on ITSLM - Manager, the following information is inherited to the target environment after failover:
-
Service performance displayed in the Home window or Real-time Monitor window is not restored in the target environment after failover; this includes the icons indicating the status of services, response times being monitored, throughput, and error rate values. If ITSLM is linked with Performance Management, the system performance is also not restored in the target environment after failover; this includes the icons indicating the status of monitoring items, measurement values of monitoring items, and availability monitoring status. The purpose of this is minimize the amount of time required for failover processing because it takes time to load service performance into memory.
-
ITSLM cannot monitor services while failover processing is underway. If failover occurs on ITSLM - Manager or ITSLM - UR while services are being monitored, service performance is not collected while the failover processing is underway, and service performance for that period will be missing.
(2) Status of detecting monitored services before and after failover
If failover occurs while ITSLM is detecting monitored services, the detection status depends on whether failover occurred on ITSLM - Manager or ITSLM - UR and the number of ITSLM - URs in the system that are detecting monitored services.
The following table shows the status of detecting monitored services before and after failover.
|
No. |
Detection status before failover |
Detection status after failover |
|
|---|---|---|---|
|
Failover that occurs on ITSLM - Manager |
Failover that occurs on ITSLM - UR |
||
|
1 |
Detecting |
Stopped |
Detecting or Stopped# |
|
2 |
Stopped |
Stopped |
|
- #
-
When failover occurs on ITSLM - UR while it is detecting monitored services, the detection processing is not restarted on the ITSLM - UR resulting in failover. If one or more ITSLM - URs are detecting monitored services in the system configuration in addition to the one resulting in failover, the status is Detecting.
If there are no more ITSLM - URs detecting monitored services other than the one resulting in failover, the status is Stopped.
If failover occurs simultaneously on both ITSLM - Manager and ITSLM - UR, the status after failover of detecting monitored services is Stopped.