using nginx to cache file serving

Hi We are using nginx SATA disks on several of our file servers.However after hitting 12MBytes/s of port speed (server nic is a 1gbps), the server gets down to it's knees. SSH becomes very slow/unresponsive and our users complain about slow speeds and dropped connections. Our users/downloaders

Re: using nginx to cache file serving

Thanks for the answeres. about the memory the problem is I'm hitting this on only some of my servers but not all, one of my servers has only 3GB memory which 1G is used but on another 16GB/16GB is used. The ngx_slowfs_cache module is usefull when the server has 2 type disks, SATA and SAS, but I