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<div class="moz-cite-prefix">I am surprised about the network. It
should go before the disk if you have a lot of short transactions.
There is a high percentage of overhead on streams of short
messages.<br>
Make sure that you check at each point where messages are passing.<br>
<br>
Have you done any mathematical modeling of the disk and network
traffic?<br>
<br>
Try changing your RAM to see if raising it (or lowering it if that
is easier) affects the problem.<br>
<br>
What is your CPU utilization like at 80 calls?<br>
<br>
How many open files do you have at 80 calls? is this near the
limit?<br>
<br>
Can you adjust the quality of the recordings to reduce the bits
stored for each second of audio?<br>
What happens when you do this?<br>
<br>
Ron<br>
<br>
On 29/01/2014 7:34 AM, Amit wrote:<br>
</div>
<blockquote cite="mid:52E8F568.5010703@avhan.com" type="cite">
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<div class="moz-cite-prefix"><font color="#000000">Thanks Ron.<br>
I will try to get these readings. About RAM disk, I will study
on how to create RAM disk and conduct this test again.<br>
There is no bottleneck on network.<br>
<br>
After 80 calls, I see call drops, delay in responding, time
out, re-transmission of SIP messages. If load is reduced, it
settles again to normal.<br>
<br>
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<p class="MsoNoSpacing"><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>
<font color="#000000"><span style="mso-ansi-language:EN-US"
lang="EN-US"> <o:p></o:p></span><br>
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On 1/28/2014 12:32 AM, Ron Wheeler wrote:<br>
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<div class="moz-cite-prefix">Can you get a reading of the total
number of I/Os during your test? Peak IOPS?<br>
That might tell you very quickly about the storage pattern
that Asterisk uses.<br>
<br>
Can you configure a RAM drive to see if disk is really the
bottleneck. May need to add some more RAM memory to your
configuration. <br>
<br>
What is your network capacity? Usually one can write faster
than the network can deliver - just to make sure that you are
chasing the right bottleneck.<br>
<br>
What happens at 80 calls to tell you that you have run out of
IOPS?<br>
<br>
Sorry for more questions than answers.<br>
<br>
Ron<br>
<br>
<br>
<br>
On 25/01/2014 12:26 AM, Amit wrote:<br>
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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 moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:ispbuilder@gmail.com"><ispbuilder@gmail.com></a>
To: Asterisk Users Mailing List - Non-Commercial Discussion
<a moz-do-not-send="true" 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 moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:52E28ADF.8020409@gmail.com"><52E28ADF.8020409@gmail.com></a>
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On 14-01-24 11:16 AM, Amit wrote:
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<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>
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<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.
<font color="#000000"><span style="mso-ansi-language:EN-US" lang="EN-US"><o:p></o:p></span></font></pre>
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<pre class="moz-signature" cols="72">--
Ron Wheeler
President
Artifact Software Inc
email: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:rwheeler@artifact-software.com">rwheeler@artifact-software.com</a>
skype: ronaldmwheeler
phone: 866-970-2435, ext 102</pre>
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<pre class="moz-signature" cols="72">--
Ron Wheeler
President
Artifact Software Inc
email: <a class="moz-txt-link-abbreviated" href="mailto:rwheeler@artifact-software.com">rwheeler@artifact-software.com</a>
skype: ronaldmwheeler
phone: 866-970-2435, ext 102</pre>
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