Hi,

I am using nginx as webserver with nginx version: nginx/1.10.2. For faster access we have mounted cache of nginx of different application on RAM.But even after giving enough buffer of size , now and then cache is getting filled , below are few details of files for your reference :
maximum size given in nginx conf file is 500G , while mouting we have given 600G of space i.e. 100G of buffer.But still it is getting filled 100%.

fstab entries :
tmpfs /cache/123 tmpfs defaults,size=600G 0 0
tmpfs /cache/456 tmpfs defaults,size=60G 0 0
tmpfs /cache/789 tmpfs defaults,size=110G 0 0

cache getting filled , df output:

tmpfs tmpfs 60G 17G 44G 28% /cache/456
tmpfs tmpfs 110G 323M 110G 1% /cache/789
tmpfs tmpfs 600G 600G 0 100% /cache/123

nginx conf details :

proxy_cache_path /cache/123 keys_zone=a123:200m levels=1:2 max_size=500g inactive=3d;

server{
listen 80;
server_name dvr.catchup.com;
location ~.*.m3u8 {
access_log /var/log/nginx/access_123.log access;
proxy_cache off;
root /xyz/123;
if (!-e $request_filename) {
#origin url will be used if content is not available on DS
proxy_pass http://10.10.10.1X;
}
}
location / {
access_log /var/log/nginx/access_123.log access;
proxy_cache_valid 3d;
proxy_cache a123;
root /xyz/123;
if (!-e $request_filename) {
#origin url will be used if content is not available on server
proxy_pass http://10.10.10.1X;
}
proxy_cache_key $proxy_host$uri;
}
}