6.1.4 Status after failover

This subsection explains the monitoring status after failover that occurred when SLM was monitoring or detecting monitored services.

Organization of this subsection

(1) Status of monitoring of monitored services before and after failover
(2) Status of detecting monitored services before and after failover

(1) Status of monitoring of monitored services before and after failover

If failover occurs while SLM is monitoring monitored services, the monitoring continues.

The following table shows the status of monitoring of monitored services before and after failover.

Table 6‒4: Status of monitoring of monitored services before and after failover
No.	Monitoring status before failover	Monitoring status after failover
No.	Monitoring status before failover	Failover that occurs on SLM - Manager	Failover that occurs on SLM - UR
1	Start	Start	Start
2	Stop	Stop	Stop
3	Starting	Stop	Stop^#1
4	Stopping	Start	Start^#2

#1: If failover of SLM - UR is completed before a monitoring start instruction is sent from SLM - Manager to SLM - UR since the user initiated monitoring start processing, the monitoring start processing continues.
#2: If failover of SLM - UR is completed before a monitoring stop instruction is sent from SLM - Manager to SLM - UR since the user initiated monitoring stop processing, the monitoring stop processing continues.

If failover occurs on SLM - 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 SLM 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.
SLM cannot monitor services while failover processing is underway. If failover occurs on SLM - Manager or SLM - 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.

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(2) Status of detecting monitored services before and after failover

If failover occurs while SLM is detecting monitored services, the detection status depends on whether failover occurred on SLM - Manager or SLM - UR and the number of SLM - URs in the system that are detecting monitored services.

The following table shows the status of detecting monitored services before and after failover.

Table 6‒5: Status of detecting monitored services before and after failover
No.	Detection status before failover	Detection status after failover
No.	Detection status before failover	Failover that occurs on SLM - Manager	Failover that occurs on SLM - UR
1	Detecting	Stopped	Detecting or Stopped^#
2	Stopped	Stopped	Stopped

#

When failover occurs on SLM - UR while it is detecting monitored services, the detection processing is not restarted on the SLM - UR resulting in failover. If one or more SLM - 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 SLM - URs detecting monitored services other than the one resulting in failover, the status is Stopped.

If failover occurs simultaneously on both SLM - Manager and SLM - UR, the status after failover of detecting monitored services is Stopped.

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