Which SE Group parameter affects the value of N for N+M HA?

Question

Options

• ACPU Reserve
• BVCPUs/Service Cores per SE
• CScale per Virtual Service
• DBuffer Service Engines

• C
  94% (17)
• D
  6% (1)

Explanation

Scale per Virtual Service defines how many active Service Engines a single Virtual Service can distribute across - this number directly sets the value of N in the N+M formula, since N represents the count of active SEs required to serve traffic.

Why the distractors are wrong:

• A (CPU Reserve): Controls how much CPU is reserved for an SE, affecting performance capacity - not the count of active SEs in an HA pair.
• B (VCPUs/Service Cores per SE): Governs the compute resources allocated to each individual SE, not how many SEs participate in HA scaling.
• D (Buffer Service Engines): This one is a classic trap - Buffer SEs directly sets M (the standby/spare count), not N. Confusing N and M here is the most common mistake.

Memory tip: Split the formula - Scale per Virtual Service = N (active), Buffer Service Engines = M (spare). "Scale" drives the active side; "Buffer" drives the backup side.

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