GTM Query - Global Availability clarification.
Hi All,
Reading the documentation, I see (what I expect Global Availability to do)...
"BIG-IP GTM distributes DNS name resolution requests to the first available virtual server in a pool. BIG-IP GTM starts at the top of a manually configured list of virtual servers and sends requests to the first available virtual server in the list. Only when the virtual server becomes unavailable does BIG-IP GTM send requests to the next virtual server in the list. Over time, the first virtual server in the list receives the most requests and the last virtual server in the list receives the least requests."
In the case of a Wide IP it'll select the first available pool. In the case of a pool, it'll select the first available virtual server.
As I gather, the first being order number 0 then 1, then 2 and so on.
So here's my setup:
- Wide IP (Method Global Availability) -> Single Pool -> Two virtual servers.
- Single Pool configured with Pref: Global Availability, Alternate: None, Fallback: Fallback IP: The IP of the first VS in the list.
- There's no monitoring against the pool, or dependencies. So both virtual servers are green, so is the pool.
Looking at the DNS resolutions, it seems quite often the second in the list is being returned.
Why is that, when the first isn't down?
Thanks,
JD