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<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>Hi All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>In previous mail lists, people talked about a solution
to record large amount of simultaneous calls. And then it seems that RAM disk
solution was the best choice due to the I/O bottleneck of Hard disk (System). Please
find the previous discussion as follows:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><a
href="http://lists.digium.com/pipermail/asterisk-users/2005-October/120930.html">http://lists.digium.com/pipermail/asterisk-users/2005-October/120930.html</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><a
href="http://thread.gmane.org/gmane.comp.telephony.pbx.asterisk.user/118497">http://thread.gmane.org/gmane.comp.telephony.pbx.asterisk.user/118497</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>I noticed that an Intel server platform comes with 4
ports SATA-II RAID0/1 controller. Please check this link:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><a
href="http://developer.intel.com/design/servers/boards/se7230nh1-e/index.htm">http://developer.intel.com/design/servers/boards/se7230nh1-e/index.htm</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>SATA-II is 3Gps I/O. so I am thinking implement this
solution for recording large amount of simultaneous calls. My proposed solution
is:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>CPU: Prentium 4 Dual core 3.2G or higher<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>RAM: 2G or more<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>OS HDD: </span></font><font size=2><span lang=EN-US
style='font-size:10.0pt'>2 x 80G SATA-II HDD for RAID 1 (for OS)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-US
style='font-size:10.0pt'>Separate HDD for voice recording: 1 x 200G SATA-II HDD
standalone<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-US
style='font-size:10.0pt'>Voice recording format: WAV<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-US
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-US
style='font-size:10.0pt'>I did a test on my Asterisk PBX. One leg of 61 seconds
WAV voice recording use </span></font><font size=2 face=Arial><span lang=EN-NZ
style='font-size:10.0pt;font-family:Arial'>947564 bytes of hard disk. I did an
optimal estimate of numbers of simultaneous calls with 3Gps without thinking of
CPU and system limitation.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-US
style='font-size:10.0pt'>Two legs: </span></font><font size=2 face=Arial><span
lang=EN-NZ style='font-size:10.0pt;font-family:Arial'>947564 x 2 x 8 = 1895128
Bytes x 8 = 15161024 bits<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'>15161024/61 = 248541 bits/s<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'>So the number of simultaneous calls 3Gps I/O can
handle:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-NZ style='font-size:
10.0pt;font-family:Arial'>3(Gps) x 1024(Mb/G) x 1024 (Kb/M) x 1024 (b/Kb) / 248541
= 12960 calls.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span lang=EN-NZ
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>512 are far less than </span></font><font size=2
face=Arial><span lang=EN-NZ style='font-size:10.0pt;font-family:Arial'>12960. So
I think the hard disk I/O should not have any bottleneck problem for 512 </span></font><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'>simultaneous
calls.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>Welcome to add your comments, do test and give
feedback.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-US style='font-size:
9.0pt;font-family:Arial'>Cheers,<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=1 face=Arial><span
lang=EN-US style='font-size:9.0pt;font-family:Arial'>Isaac Xiao</span></font></st1:PersonName><font
size=1 face=Arial><span lang=EN-US style='font-size:9.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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