Hi,
I have a video on demand server.
12x1 TB SATA2 RAID10 with 1Gbps connection, Debian 7 (ext4)
I have high disk utilization and so I wanted to make some changes to increase performance for big video files:
I made following changes:
sendfile off;
aio on;
directio 512k;
output_buffers 1 1m;
The disk utilization and the load average went down and the memory usage went up, which is no problem because I have enough RAM.
So far so good. The only problem is that I get often following error now:
[crit] 26649#26649: *39145 pread() "/opt/nginx/html/XXX/91.mp4" failed (22: Invalid argument), request: "GET /XXX/XX.mp4?start=2189.223&start_sec=2189.223 HTTP/1.1"
The client get then a 5xx response back.
I use a native HTML5 player and the kernel player for playback. The kernel player add a querystring to the request which I dont use. But only these requests produce the error and not every time.
Best Regards
Wolfgang
