> Why I can set minimum and maximum instances when a new instance goes
> up all my cached keys are invalidated?

I'm not quite sure what you mean by this, but I'm guessing it means
something like "what's the point in having multiple instances if the
new ones don't have the old keys?"
If so, this is your answer:

By having more servers, it follows that there is more memory or space
available in which to store your data. If your cache servers are
getting high traffic, more might start up to meet the demand; you need
only write once (for example, from the database) for the new key to
exist on the new server, and for all subsequent requests to be able to
read it - increasing the speed of your app.

In effect, this is more efficient... the new server will soon contain
only the data which your application is actually requesting.

Hope that helps,

Martin
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