[App_rpt-users] DIAL 8.5 and VM's on ProxMox

[David McGough]

To REALLY tell how well any environment is working, you need to check the
timing quality as reported from the dahdi kernel drivers. Many
environments (particularly VPS!) do rather poorly in the area. Poor
results typically mean audio choppiness and poor telemetry timing (e.g.:  
Bad CW or tone timing), particularly where the server is used as a hub
with many users connecting, needing to mix many audio streams. Note that
this is an asterisk thing, not specifically AllStar. Many messages have
been written about this in other asterisk related forums; goog'ling will
find many results.

To test the timing quality, use the dahdi_test command. Jitter in the
timing results and accuracy less than about 99.8% means less than perfect
performance and potentially mediocre results.

Here is a sample run from my dev RPi3 system with 3 nodes (2 usb audio, 1 
pseudo) active:

[root at alarmpi-kb4fxc asterisk]# dahdi_test -c 100
Opened pseudo dahdi interface, measuring accuracy...
99.992% 99.990% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994% 
99.995% 99.993% 99.996% 99.994% 99.994% 99.994% 99.995% 99.996% 
99.993% 99.993% 99.994% 99.995% 99.995% 99.994% 99.994% 99.994% 
99.994% 99.995% 99.993% 99.994% 99.994% 99.994% 99.995% 99.993% 
99.994% 99.993% 99.994% 99.995% 99.993% 99.994% 99.994% 99.994% 
99.996% 99.993% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994% 
99.994% 99.994% 99.996% 99.994% 99.994% 99.993% 99.994% 99.995% 
99.995% 99.993% 99.994% 99.995% 99.995% 99.995% 99.994% 99.994% 
99.994% 99.994% 99.994% 99.994% 99.994% 99.995% 99.995% 99.994% 
99.994% 99.993% 99.994% 99.996% 99.993% 99.995% 99.994% 99.995% 
99.996% 99.993% 99.994% 99.994% 99.995% 99.996% 99.994% 99.994% 
99.994% 99.994% 99.996% 99.994% 99.994% 99.995% 99.994% 99.996% 
99.994% 99.993% 
--- Results after 98 passes ---
Best: 99.996% -- Worst: 99.990% -- Average: 99.994247%
Cummulative Accuracy (not per pass): 99.994


73, David KB4FXC


On Mon, 27 Nov 2017, Benjamin Naber wrote:

> For those of you who are into this sort of thing, DIAL 8.5 has been
installed, conbooberated and running successfully with no apparent lag,
on the latest stable version of Proxmox. Currently, it is a radio-less
node.

The test environment is a cluster of three Dell R310 servers (nodes),
each with 16GB+ RAM, RAID 1 system drives, some other volume drives,
10GB fiber storage network links, and 1GB network connections.

Each of three nodes have other VMs running on them, running stuff like
BIONIC, and other silly things for 'stress' testing, as the system is
being evaluated for production environment.

To my understanding, proxmox is not a load-sharing/proxy/cloud
computing network, each VM is hosted/homed on a single node, but has
"live" versions on the other nodes in the cluster. Should a node suffer
both power supply failures, or CPU fan squeals to a stop, or the RAID
controller dies, within a minute or so, another node will spin up the
live versions of the VMs that were on the now dead node.

So far, that has not been any noticeable lag, jitters, delay, otherwise
anything negative, much to my surprise. This is a 101 for me on VM
stuff, never messed with it until now.

If anyone wants to assist in testing, you are invited to connect to
29567
Tuesday night, 7PM Central/8PM Eastern for our weekly Allstar Technical
Net.

I am calling the net tomorrow night, to which the topics are advanced
ASL node configurations, and some other stuff I have to be reminded of.

There is chatter throughout the days, more-so at night, so anyone is
welcome to connect anytime!


Don't be a square, connect to there!

~Benjamin, KB9LFZ


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