Service levels

Hi all

Just when I thought that I had worked on Service levels...

I tried the following two provisions separately within Service Builder:

Service Service [Global] [Global]

Service Cluster Cluster Service [Global] [Local]

node1a                                                                 node1a

node1b                                                                 node1b

host2                                                                      host2

host3                                                                      host3

The color coding is quite simply for the sake of description and show different levels of services.

  • [Global] service is all 'container' for the hosts contained in the service and overall.
  • host2 and host3 are hosts of autonomous - if two of them have a fatal alarm, which affects the service so the number of SLA fall of 100%.
  • Cluster service is the 'container' for the two-node cluster and is at the same level as host2 and host3.  I tried both a local and a global service for this service.
  • node1a and node1b is a two-node cluster - if one of these nodes has a fatal alarm, this should not affect the number of ALS as the other node is still ongoing.  I have created a registry setting in FSMServiceSLP_PercentageAvailableThreshold for Service Cluster [Global] against the value of 50, as well as Service of Cluster [Local] FSMService against FSMChildService of a value of 50, the logic being that 50% of guests at the service (i.e. a server) is always available, the availability of the service is not affected.

My understanding is that availability of service numbers are inherited "upwards".  In other words, if I create a fatal alert on node1a, what should happen is that Cluster Service remains at 100% (there are still 50% of the available servers node1b still works, that's why the service is not affected) and Global Service remains at 100%.

However, what seems to happen in practice, it is that the Cluster Service remains at 100%, but the Global Service begins to drop his SLA figure, showing a loss of service.  This is the case without worrying if the Cluster Service is defined as a local or a global service.  This can be confirmed by visiting the dashboard of Service for the Cluster Service and Service levels although there is a fatal alarm for node1a.

Is it possible for the figure of service level should be given exactly?  In other words, the Service should remain 100% unless that be host2 and host3 or (node1a and node1b) are not available?

It comes to vFoglight PRO 6.7.1 build 5.6.4.2.  I built the services in the usual way, the option «Foglight can automatically add hosts...» "is not selected and the level is set to the default"let Foglight decide. "

Thank you

Brian

Well, we have this finally solved - Foglight does not calculate the availability of level of service properly, at least not in the way we have been lead to believe.  To summarize...

If the function is defined as follows:

[Global] service

[Global] Cluster service

node1a

node1b

host2

host3

If node1a has a fatal alarm, Service [Global] Cluster is not affected (which is OK because it has a value of registry FSMServiceSLP_PercentageAvailableThreshold of 50), but [Global] Service starts to drop (which shouldn't happen).  This is because the level of service availability calculation is also global alarms that would also alarms the child objects.  To work around this, change the level of availability of underlying service code.

Go to Administration | Data | Manage the derived parameters and filter availability:

Select the metric range derived from FSMServiceLevelPolicy: sourceIds = $null by clicking on availability:

Select the calculations derived metric by clicking on FSMServiceLevelPolicy: sourceIds = $null:

Replace the existing code in the code Expression box in the attachment, and then click Save.  This operation takes you to the screen change the derived metric.  You need to click on save here too, otherwise your code will not change.

When you install your services, you can use global services to allow you to reuse the service in other parts of your service structure, however, when you set the percentages in the Variable of registry FSMServiceSLP_PercentageAvailableThreshold, these values are set against the topology of FSMServiceLevelPolicy Type:

Once all this is done, the availability of level of Service for the [Global] is displayed and calculated correctly.

My thanks to Philipp von dem Bussche-Hünnefeld from Dell to provide the code and help and especially for allowing me to share with the communities.

Brian

Warning: a full assessment has not been made to see if there is an impact on the other customer on the SLA management scenarios, so use this code at your own risk.

Additional accessories:

Tags: Dell Tech

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