Hello,
I made some tests on XFileSharingPro using 6 concurrent connections to upload on a virtual server: 2GB RAM , 2 cores with 8MB cache, hard disk 10k rotations.
The total uploading speed was around 65 MB.
After a few seconds the load on the server was high, 3 of 6 uploads failed and apache became unresponsive. Where can be the problem?