[asterisk-users] IOPS required by Asterisk for Call Recording

[Amit]

Thanks Ron.
I will try to get these readings. About RAM disk, I will study on how to 
create RAM disk and conduct this test again.
There is no bottleneck on network.

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.

*Thanks & Regards,*
Amit Patkar



On 1/28/2014 12:32 AM, Ron Wheeler wrote:
> Can you get a reading of the total number of I/Os during your test? 
> Peak IOPS?
> That might tell you very quickly about the storage pattern that 
> Asterisk uses.
>
> 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.
>
> 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.
>
> What happens at 80 calls to tell you that you have run out of IOPS?
>
> Sorry for more questions than answers.
>
> Ron
>
>
>
> On 25/01/2014 12:26 AM, Amit wrote:
>> 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<ispbuilder at gmail.com>
>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>> 	<asterisk-users at lists.digium.com>
>> Subject: Re: [asterisk-users] IOPS required by Asterisk for Call
>> 	Recording
>> Message-ID:<52E28ADF.8020409 at gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> On 14-01-24 11:16 AM, Amit wrote:
>>> 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.
>> 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.
>
> -- 
> Ron Wheeler
> President
> Artifact Software Inc
> email:rwheeler at artifact-software.com
> skype: ronaldmwheeler
> phone: 866-970-2435, ext 102


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