Hi have the varnish with apache and cpanel on 10 servers and on all server i have two problems.
1-If i download a file with 10M the download stop before completing the file size, ex. stop after downloaded 2M
2-If i download a file with 10GB the error 503 is displayed and the download not start.
I am using this options to run the varnishd:
varnishd -P /var/run/varnish.pid -a :80 -f /etc/varnish/default.vcl -p thread_pools 3 -p thread_pool_min 150 -p thread_pool_max 1500 -p thread_pool_add_delay 2 -p sess_workspace 32768 -s malloc,1G