<div dir="ltr"><div>We're using 4XSata HDD 7200 rpm and yes it is hardly crossing 20MB/sec. Could you please guide me a bit about the Max speed of SATA read?<br><br></div>Thanks for prompt reply.<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Tue, Jul 16, 2013 at 10:06 AM, Steve Holdoway <span dir="ltr"><<a href="mailto:steve@greengecko.co.nz" target="_blank">steve@greengecko.co.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Your disk maxes out at 20MB/sec read?<br>
<div><div class="h5"><br>
On Tue, 2013-07-16 at 09:59 +0500, shahzaib shahzaib wrote:<br>
> Hello,<br>
><br>
><br>
> We're using nginx-1.2.8 to serve large static files for video<br>
> streaming. However all nginx worker_processes are in "D" state and HDD<br>
> I/O utilization is 99%.<br>
><br>
> [root@DNTX010 ~]# ps aux |grep nginx<br>
> root 3046 0.0 0.0 20272 688 ? Ss 20:39 0:00<br>
> nginx: master process nginx<br>
> nginx 3047 3.2 0.9 94480 74808 ? D 20:39 0:03<br>
> nginx: worker process<br>
> nginx 3048 1.4 0.3 52104 31388 ? D 20:39 0:01<br>
> nginx: worker process<br>
> nginx 3049 0.2 0.1 33156 12156 ? S 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3050 0.1 0.1 29968 8844 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3051 0.2 0.1 30332 10076 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3052 2.7 0.8 91788 69504 ? D 20:39 0:02<br>
> nginx: worker process<br>
> nginx 3053 0.3 0.0 25632 5384 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3054 0.2 0.1 36032 15852 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3055 0.4 0.2 37592 17396 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3056 0.2 0.1 32580 11028 ? S 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3057 0.3 0.2 39288 19116 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3058 0.3 0.2 41764 19744 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3059 0.3 0.1 31124 10480 ? D 20:39 0:00<br>
> nginx: worker process<br>
> nginx 3060 1.0 0.3 52736 31776 ? D 20:39 0:01<br>
> nginx: worker process<br>
> nginx 3061 1.1 0.3 51920 29956 ? D 20:39 0:01<br>
> nginx: worker process<br>
> nginx 3062 1.6 0.4 58808 35548 ? D 20:39 0:01<br>
> nginx: worker process<br>
><br>
><br>
> [root@DNTX010 ~]# iostat -x -d 3<br>
> Linux 2.6.32-358.6.2.el6.x86_64 (DNTX010.local) 07/16/2013<br>
> _x86_64_ (8 CPU)<br>
><br>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s<br>
> avgrq-sz avgqu-sz await svctm %util<br>
> sda 30.28 177.37 260.32 2.96 38169.26 1442.70<br>
> 150.46 2.29 8.70 3.52 92.78<br>
><br>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s<br>
> avgrq-sz avgqu-sz await svctm %util<br>
> sda 4.33 0.00 544.00 0.00 34376.00 0.00<br>
> 63.19 43.83 75.25 1.84 100.00<br>
><br>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s<br>
> avgrq-sz avgqu-sz await svctm %util<br>
> sda 9.00 6.33 547.67 0.67 34637.33 56.00<br>
> 63.27 48.01 86.20 1.82 100.00<br>
><br>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s<br>
> avgrq-sz avgqu-sz await svctm %util<br>
> sda 0.00 0.67 568.00 2.33 36024.00 29.33<br>
> 63.21 54.98 101.10 1.75 100.00<br>
><br>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s<br>
> avgrq-sz avgqu-sz await svctm %util<br>
> sda 0.00 4.33 560.33 1.33 35712.00 45.33<br>
> 63.66 37.20 65.06 1.78 100.00<br>
><br>
><br>
><br>
> Nginx.conf :<br>
><br>
> http {<br>
> include mime.types;<br>
> default_type application/octet-stream;<br>
> client_body_buffer_size 128K;<br>
> sendfile_max_chunk 128k;<br>
> client_max_body_size 800m;<br>
> client_header_buffer_size 256k;<br>
> large_client_header_buffers 4 256k;<br>
> output_buffers 1 512k;<br>
> server_tokens off; #Conceals nginx version<br>
> #access_log logs/access.log main;<br>
> access_log off;<br>
> error_log warn;<br>
> sendfile on;<br>
><br>
> # aio on;<br>
><br>
> # directio 512k;<br>
><br>
> ignore_invalid_headers on;<br>
> client_header_timeout 3m;<br>
> client_body_timeout 3m;<br>
> send_timeout 3m;<br>
> keepalive_timeout 0;<br>
> reset_timedout_connection on;<br>
> }<br>
><br>
><br>
> We've also tried enabling aio directive but nothing changed. Help will<br>
> be highly appreciated.<br>
><br>
><br>
> Thanks<br>
> Shahzaib<br>
><br>
><br>
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<span class="HOEnZb"><font color="#888888"><br>
--<br>
Steve Holdoway BSc(Hons) MNZCS<br>
<a href="http://www.greengecko.co.nz" target="_blank">http://www.greengecko.co.nz</a><br>
Linkedin: <a href="http://www.linkedin.com/in/steveholdoway" target="_blank">http://www.linkedin.com/in/steveholdoway</a><br>
Skype: sholdowa<br>
<br>
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</font></span></blockquote></div><br></div>