Hi, recently we noticed that the version 1.7.3 added a feature important to our infrastructure: "cache revalidation now uses If-None-Match header if possible.".
So we changed part of our cache to the 1.7.4 version, but something strange started to happen, at certain point of disk usage nginx started to return 500 to all requests with this kind of message in the error log:

[crit] 12908#0: *7209656 open() "/cache/nginx_tmp/0002938835" failed (28: No space left on device) while reading upstream, client: xxx.xxx.xxx.xxx, server: , request: "GET http://xxxxxxxx.net/ HTTP/1.1", upstream: "http://xxx.xx.xxx.xxx:80/", host: "xxxxxxxx.net"

It looked like that there wasn't enough space in the temporary cache directory. But running df -h (and after sync && df -h) the result was:

[user@nginx ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 7.8G 2.3G 5.4G 30% /
devtmpfs 3.7G 20K 3.7G 1% /dev
tmpfs 3.7G 0 3.7G 0% /dev/shm
/dev/xvdb 40G 12G 27G 31% 24% /cache ---------------------------------------- used for cache

I think that is important to know that a very similar configuration is running well in a 1.7.2 server with the same specs and without the cache revalidation directives.

This is my cache path configuration:

proxy_cache_path /cache/nginx levels=1:2 keys_zone=cache:1500m max_size=27G inactive=1200m;


Can you help?

Gabriel Arrais.