How can I do load Balancing in varnish ?

I have two backends with different hardware configurations. Can I do load balancing in the ration of hardware, like out of 4 only 1 request should go to 2nd backend

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Try the following VCL config. This is for Vanish 4 and I haven’t tested this yet, so make a backup of your existing VCL file.

import directors;

backend web1 {
    .host = "";
    .port = "80";

backend web2 {
    .host = "";
    .port = "80";

sub vcl_init {
    new apache = directors.random();
    apache.add_backend(web1, 3);
    apache.add_backend(web2, 1);