I would also do some math on the bandwidth requirement.
If you divide your disk bandwidth by your recording bit rate what is the
theoretical maximum number of calls that you can record at once? Assumes
that you have infinite CPU and memory and that you can actually drive
the disks at their maximum.
If this comes out to 300, you are already there. If it comes out to
3000, you have something wrong in your setup or your assumptions and a
target to work towards.
What quality are you using in the recording? 44k per second(CD quality
sound) uses a lot more bandwidth than 3K (telephone quality)
What encoding are you using?
How low a bit rate can you use and still have usable recordings? If they
are for legal or audit use, you can go pretty low. If you are recording
soundtracks for reuse in training or publication, you may require higher
bit rates.
If you disable recording, how many simultaneous calls can you support?
Just to be sure that recording is the issue.
Ron
On 23/07/2014 4:29 PM, Scott Griepentrog wrote:
Your bottleneck is most likely your drive bandwidth. Even with SAS
drives, you'll need to move to a raid 5+ solution with 6+ drives to
continue to increase the concurrent calls, or use a storage appliance.
To confirm this, install the tool nmon and use the v and d options to
bring up the resource usage indicators and drive busy/throughput
statistics.
On Wed, Jul 23, 2014 at 2:48 PM, Eduardo Leones
<[email protected] <mailto:[email protected]>>
wrote:
people
I have a running Asterisk 1.8.28 in great Dell server with two
xeon processors and 16gb of ram and HD SAS 15k (Raid 1). This
server is recording all calls (placed to record the audio in a ram
disk), the entire CDR goes straight to MySQL by cdr_mysql.so. Each
call runs some validation and AGI's have an auto dialer system
that generates calls over the manager. Calls originate and
terminate via SIP (no transcode).
With this structure, even being a great server, we can not spend
150 simultaneous calls. When it reaches 140, the load average goes
up a lot and the calls start to get very bad audio, tear, etc..
Using the top we see that all the processing is for asterisk. In
this scenario, I think there is some limitation in Asterisk, or
even the manager due to the auto dialer.
Can anyone give me any tips where I can look where is the
bottleneck? I need to get at least 250 calls that server quality.
tks
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