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<pre wrap="">Thanks for response.
How do I derive the requirement? I need to size IO system to record multiple calls concurrently.
I ran test with following configuration
Quad Core Xeon with 4GB RAM
250GB SATA disk (No RAID)
Linux (CentOS 5.9)
Asterisk 1.8.20
I failed to record more than 80 calls.
If I run test with simple IVR, I achieved 400+ calls with same server.
So write seem to be an issue.
Is there any way to tune / optimize / configure for better write performance?
I am not sure if I need to post this query on developers list? Please guide...
Regards
Amit Patkar
Message: 1
Date: Fri, 24 Jan 2014 11:46:39 -0400
From: Mike <a class="moz-txt-link-rfc2396E" href="mailto:ispbuilder@gmail.com"><ispbuilder@gmail.com></a>
To: Asterisk Users Mailing List - Non-Commercial Discussion
<a class="moz-txt-link-rfc2396E" href="mailto:asterisk-users@lists.digium.com"><asterisk-users@lists.digium.com></a>
Subject: Re: [asterisk-users] IOPS required by Asterisk for Call
Recording
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:52E28ADF.8020409@gmail.com"><52E28ADF.8020409@gmail.com></a>
Content-Type: text/plain; charset="iso-8859-1"
On 14-01-24 11:16 AM, Amit wrote:
</pre>
<blockquote type="cite" style="color: #000000;">
<pre wrap="">If I assume that Asterisk will write data on disk every second for
each call, I will need disk array to support minimum of 500 IOPS.
Where as if Asterisk push data every 2 seconds, I can deal with array
supporting 250 IOPS.
But if I assume that Asterisk will write data on disk for every RTP
packet received, as and when received, I will need disk IO system with
approx 25000 IOPS assuming 20 ms RTP packet.
</pre>
</blockquote>
<pre wrap="">You're assuming that asterisk will perform an fsync() after each write.
If asterisk writes without an fsync after each write, then the OS will
schedule writes intelligently based on RAM/disk IO available rather than
scheduling each one as a separate write.
Looking at the code for ast_writestream() there doesn't appear to be an
fsync() type call after each write, but someone more familiar with the
internals of Asterisk would be better able to verify that.
<div class="moz-txt-sig">--
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Internet industry, preferably working remotely.
Building / Supporting the net since 2400 baud was
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Message: 2
Date: Fri, 24 Jan 2014 16:34:17 +0000
From: A J Stiles <a class="moz-txt-link-rfc2396E" href="mailto:asterisk_list@earthshod.co.uk"><asterisk_list@earthshod.co.uk></a>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<a class="moz-txt-link-rfc2396E" href="mailto:asterisk-users@lists.digium.com"><asterisk-users@lists.digium.com></a>
Subject: Re: [asterisk-users] IOPS required by Asterisk for Call
Recording
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:201401241634.17311.asterisk_list@earthshod.co.uk"><201401241634.17311.asterisk_list@earthshod.co.uk></a>
Content-Type: Text/Plain; charset="iso-8859-6"
On Friday 24 January 2014, Mike wrote:
</div></pre>
<blockquote type="cite" style="color: #000000;">
<pre wrap="">On 14-01-24 11:16 AM, Amit wrote:
</pre>
<blockquote type="cite" style="color: #000000;">
<pre wrap="">If I assume that Asterisk will write data on disk every second for
each call, I will need disk array to support minimum of 500 IOPS.
Where as if Asterisk push data every 2 seconds, I can deal with array
supporting 250 IOPS.
But if I assume that Asterisk will write data on disk for every RTP
packet received, as and when received, I will need disk IO system with
approx 25000 IOPS assuming 20 ms RTP packet.
</pre>
</blockquote>
<pre wrap="">You're assuming that asterisk will perform an fsync() after each write.
If asterisk writes without an fsync after each write, then the OS will
schedule writes intelligently based on RAM/disk IO available rather than
scheduling each one as a separate write.
Looking at the code for ast_writestream() there doesn't appear to be an
fsync() type call after each write, but someone more familiar with the
internals of Asterisk would be better able to verify that.
</pre>
</blockquote>
<pre wrap="">If you are running on Linux, don't forget that Linux's default behaviour is to
cache all disk writes until the machine is rebooted or the RAM is needed for
something else, and service read operations from the cache. In fact, it's
entirely possible for a temporary file to be written, read and deleted without
ever going anywhere near a molecule of oxide.
Solaris has the opposite default caching strategy -- it assumes the worst
about filesystem integrity, and write operations block until decaching and
verifying have finished.
<div class="moz-txt-sig">--
AJS
Answers come <b class="moz-txt-star"><span class="moz-txt-tag">*</span>after<span class="moz-txt-tag">*</span></b> questions.
</div></pre>
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<p class="MsoNoSpacing"><b><span
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& Regards,</span></b><span
style="mso-ansi-language:EN-US" lang="EN-US"><o:p></o:p><br>
Amit Patkar<o:p></o:p></span></p>
<br>
<span style="mso-ansi-language:EN-US" lang="EN-US"><o:p></o:p></span>
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On 1/24/2014 8:46 PM, Amit wrote:<br>
</div>
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charset=ISO-8859-1">
<font color="#000000" face="Calibri">Hi<br>
<br>
What are the disk IOPS required for Asterisk call recording?<br>
I am trying to find out number of disks required in RAID array
to record 500 calls.<br>
Is there any formula to calculate IOPS required by Asterisk call
recording? This will help me to find IOPS for different scale.<br>
<br>
If I assume that Asterisk will write data on disk every second
for each call, I will need disk array to support minimum of 500
IOPS. Where as if Asterisk push data every 2 seconds, I can deal
with array supporting 250 IOPS. <br>
But if I assume that Asterisk will write data on disk for every
RTP packet received, as and when received, I will need disk IO
system with approx 25000 IOPS assuming 20 ms RTP packet.<br>
<br>
Please assist me on this requirement.<br>
</font>
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<div class="WordSection1">
<p class="MsoNormal"><font color="#000000"><b><span
style="mso-ansi-language:EN-US" lang="EN-US">Thanks
& Regards,</span></b><span
style="mso-ansi-language:EN-US" lang="EN-US"><o:p></o:p><br>
Amit Patkar<o:p></o:p></span></font></p>
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