How to prevent varnish from deleting its entire cache when full?

[Fredrik Kristiansen]

Hi,

I'm trying to prevent varnish from deleting its entire cache when full. So I
have added this our VCL confguration:

sub vcl_discard {
    # Keep objects in use last 5 minutes
    if (obj.lastuse > 300) {
        discard;
    }

    keep;
}

But variable obj.lastuse don't seem to be available and varnish won't start
with this script.

Fredrik Kristiansen
Nettby.no
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