Strategies for splitting load across varnish instances? And avoiding single-point-of-failure?

[John Norman]

Folks,

A couple more questions:

(1) Are they any good strategies for splitting load across Varnish
front-ends? Or is the common practice to have just one Varnish server?

(2) How do people avoid single-point-of-failure for Varnish? Do people
run Varnish on two servers, amassing similar local caches, but put
something in front of the two Varnishes? Or round-robin-DNS?

John