I've found a couple of similar questions to mine however they're either too confusing or the answers do not fit my requirement so please accept my apologies if this seems like it's already been answered.
I have 2 data centres with different ip address ranges.
I have a gtm (v10) configured at each site which sync up with each other.
I have a web site configured (clones at each site) - the gtm dns has an ip address for each range configured for my web site.
My problem... if one of the developers take one of the sites offline (for maintenance) then the client browsers that were connected to downed site are affected in that they experience a blank screen on their next click.
Refreshing (i.e. pressing F5) the browser doesn't work. However closing the browser and opening it again does seem to resolve the problem, or if you wait a while (5 mins +) the site will return. Far from ideal for our customers. I understand this is a dns / local cache issue.
This seems like a standard / minimum requirement for most of us I would imagine, and I'm sure others have experienced this issue too.
Do I have to live with this situation or is there anything I can do to resolve or minimise the impact on our customer's experience when browsing our site?
It might also be worth mentioning that our web site config is using persistence seen as the customer session will add items to their basket. Some of our site will be serverd via https too.
Any help or guidance would be greatly appreciated.