How to duplicate cached data on all Varnish instance?

[Xianzhe Wang]

Here I take nginx as a load balancer and it contects 2 varnish severs.
I wanna share the cache object between 2 varnishes.
When one varnish is down, the left one will work fine, and the cache object
is still work.
Is there anything I can do for this?

I aslo saw an  example something like this:
https://www.varnish-cache.org/trac/wiki/VCLExampleHashIgnoreBusy
But i think it will increase network delay. So I don't want do it like this.

Is someone can share their experience? Thanks a lot.

Shawn
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