Intermittent cache write failures with files or memcached - NginX, PHP-FPM, Load Balanced

Howdy :)

To give you a feel for the environment, we have a highly available configuration of two load balanced web servers and two database servers (master/slave). We are using CakePHP 2.2.1 on NginX and PHP-FPM with PHP 5.4. We are noticing intermittent cache write failures despite having tried both file based caching and memcached. For file based caching, even with permissions being 777 and the umask set to 777, a cache file cannot be overwritten once it is written. On the memcached side, the store failures follow the same pattern. Once it has been written, it cannot be overwritten when it expires.

I am at a loss. At first I thought it had something to do with our file syncing on the web servers but then we moved to memcached to sitestep the issue and we are having the same problem. Any ideas?

Thanks in advance!

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