Dell Vizioncore Manual de usuario descargar pdf (Pagina 352)

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Administration and Configuration Guide

creating rules simpler and more efficient by creating a derived metric scoped to the

same topology type and using it in these rules’ conditions. See “Examples” on page 490

for an example.

In addition, creating a derived metric could help you manage these rules. For example,

if the metric expression used in the rules’ conditions needed to be calculated differently,

you could simply edit the expression for the derived metric instead of editing multiple

conditions.

Example: Using a Single Derivation with Multiple Scoping or

Multiple Derivations

Derivation definitions will allow multiple scoping query/expression pairs under a single

definition. For each topology object, the expression paired with the first scoping query

which matches the object will be calculated. This allows you to override a derivation

definition based on the scoping query where multiple derivations definitions exist.

Use the following guidelines to decide when to use one derivation with multiple scopes,

or when to use multiple derivation definitions:

• Choose a single derivation definition when you need the overriding behavior. If

you have a subset of a topology object type that requires a derivation to be

calculated differently, use a single derivation definition with additional scope/

expression pairs.

For example, you have a derivation

freeMemory for topology type OS, with a

subtype

Unix that requires a different freeMemory calculation. Define a single

derivation

freeMemory create two scope/expression pairs (one for OS and the

other for

Unix).

• Choose a multiple derivation definition when you are using the same observation

name for unrelated scoping queries.

For example, if you have a derivation

freeMemory for the types OS and JVM,

create two separate derivations to avoid coupling the definitions.

• Choose multiple derivation definitions when you have alternate ways of

calculating the same observation for the same topology objects. If you keep the

calculations in the same derivation definition, only the first calculation in the list

will take affect.

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