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F5

101 · Question #30

You have a pool of servers that need to be tested. All of the servers but one should be tested every 10 seconds, but one is slower and should only be tested every 20 seconds. How do you proceed.

The correct answer is D. It can be done by assigning one monitor to the pool and a different monitor to the slower pool. In F5 BIG-IP, a pool member can be assigned its own monitor that overrides the pool-level monitor, enabling different check intervals per member.

Section 3: Load Balancing and High Availability Basics

Question

You have a pool of servers that need to be tested. All of the servers but one should be tested every 10 seconds, but one is slower and should only be tested every 20 seconds. How do you proceed.

Options

  • AIt cannot be done. All monitors test every five seconds.
  • BIt can be done, but will require assigning monitors to each pool member.
  • CIt cannot be done. All of the members of a pool must be tested at the same frequency.
  • DIt can be done by assigning one monitor to the pool and a different monitor to the slower pool

How the community answered

(49 responses)
  • A
    4% (2)
  • B
    6% (3)
  • C
    12% (6)
  • D
    78% (38)

Why each option

In F5 BIG-IP, a pool member can be assigned its own monitor that overrides the pool-level monitor, enabling different check intervals per member.

AIt cannot be done. All monitors test every five seconds.

The monitoring interval is a configurable parameter on each monitor object and is not fixed at five seconds.

BIt can be done, but will require assigning monitors to each pool member.

Assigning individual monitors to every pool member is not required - a single pool-level monitor combined with one member-level override is sufficient to achieve different intervals.

CIt cannot be done. All of the members of a pool must be tested at the same frequency.

Pool members are not required to share the same monitoring frequency because a monitor assigned directly to a pool member overrides the pool-level assignment for that member only.

DIt can be done by assigning one monitor to the pool and a different monitor to the slower poolCorrect

BIG-IP supports assigning a monitor at the pool level for all members and assigning a separate, different monitor directly to an individual pool member. The member-level monitor takes precedence for that specific node, allowing the slower server to be checked every 20 seconds while the pool monitor checks all remaining members every 10 seconds - no per-member assignment across the entire pool is required.

Concept tested: F5 BIG-IP per-pool-member monitor override assignment

Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-local-traffic-management-getting-started-guide.html

Topics

#monitor interval#pool member monitor#monitor assignment

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