I've heard about PHP-FPM about a month ago from DirectAdmin webboard. Then, a few weeks ago, I had a couple websites that I need to make it run faster. After tried to do many things with it like ... to use mod_fcgid / XCache / Memcached, I feel like there was something in XCache since "Page execution time" is quite high. Then, I remember that I've read from many websites that XCache doesn't really work with mod_fcgid. From the technical point, all of them explained it clearly to understand.
My server run DirectAdmin with mod_fcgid installed. After I tuned MySQL. I, then, restarted both httpd and MySQL service. Both services started without any problem but I can't access my website at all. After I checked my Apache Error log, I found an error which said :
[emerg] (28)No space left on device: mod_fcgid: Can't create global fcgid-proctbl mutex
After search around how to fix this problem, I believe it's something about IPCS. Try run
# ipcs -a