<div dir="ltr"><div><div><div>Our server HDD i/o is constant on 8MB/s and i/o utilization + await is very high due to which nginx video streaming is really slow and we're receiving complains from our users regarding slow streaming of the videos.<br>
<br></div>We're using 12X3TB SATA HDD Hardware-Raid10 with 16G RAM<br>OS Centos 6.4<br><br> 8MB/s w/r should not be issue for 12X3TB SATA HDD. Maybe i need to tweak some nginx buffers or kernels in order to reduce the high io wait ?<br>
<br></div>Could someone point me to the right direction ? We can't afford SAS Drives right now and have to go with the SATA.<br><br>Linux 2.6.32-431.17.1.el6.x86_64 (storage17) 06/16/2014 _x86_64_ (8 CPU)<br>
<br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 123.66 336.85 118.87 7.67 19496.19 2759.42 175.88 2.40 18.93 6.27 79.35<br>
<br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 75.00 8.67 108.00 2.00 18117.33 85.33 165.48 1.88 17.05 6.86 75.47<br>
<br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 76.00 0.00 94.00 0.33 17192.00 2.67 182.28 1.50 16.04 7.47 70.47<br>
<br></div><div>Any help would be highly appreciated.<br></div><div><br></div>Regards.<br>Shahzaib<br></div>