We're running modpack called GT New Horizons and for quite some time now the server stalls every once in a while, causing players to time out.
The server has enough RAM and CPU power, TPS is always at 20 with 10ms work time.
Sampler managed to get some info but we lack the skill to pin point the problem when google fails.
Sampler log: http://pastebin.com/M4rspZvJ
Server log: http://pastebin.com/qa4kULKu - happens at 16:32:15
The "Server Thread" is always at the top with the same error you can see in the sampler log.
Does that have something to do with world saving and disk I/O?
Thanks for all the help,
After removing fastcraft we get a lot more of these