High availibility load balancing in GTM

Are you asking how doe GTM/GSLB provide priority based responses? That would be to set the pool with the load balancing method of "Global Availability" That takes into account the "Member Order" for the pool members with priority zero being the 'top' priority in the list.

Hi Brad

thanks for your response, we usually do priority based laod balancing in LTM (we call it high availibilty), So My question is do we have any option in GTM Similar to that ONe.

I don't think there is a concept of 'priority groups' in GTM like there is in LTM, but Global Availability will return the first available member in the list based on the priority.

Otherwise it would probably require an iRule to determine which member that should be selected based on your specific criteria.

But I'm definitely not an expert on this-- i have setup priority based selection for a specific requirement to keep traffic to specific pool member (data center) as long as it is available. The GTM pool member points to a LTM virtual server that then provides the next layer of selection of a member (server) within that data center.

Like Brad said, its the GA you should use. Priority is not something HA.

Global Availability mode

The Global Availability load balancing mode uses the virtual servers included in the pool in the order in which they are listed. For each connection request, this mode starts at the top of the list and sends the connection to the first available virtual server in the list. Only when the current virtual server is full or otherwise unavailable does Global Availability mode move to the next virtual server in the list. Over time, the first virtual server in the list receives the most connections and the last virtual server in the list receives the least number of connections.