Iris Management Suite
Technical Guide V1.7C 4/11/07
5
3 System Sizing
There are a number of factors that should be considered when sizing an IRIS
Management Suite system.
The details below are based on the assumption that the main system activity
is diallers polling into the IRIS Polling Engine and that the amount of alarm
traffic (even at peak levels during opening/closing periods) is not significant.
1) Polling Engine PC platform performance.
In practice any medium spec PC platform (e.g. 2.5 GHz processor with
512Mbyte RAM) will be adequate, providing it is dedicated to this
application. Chiron have successfully tested such a system running
with a simulation of 5000 remote diallers polling at 30s intervals.
It is recommended that a Windows Server platform is used
2) Disk capacity.
This is really only of significance to the storage of IRIS log files, in
which all activity including all polls and alarm messages are recorded.
Typically a days’ log file for a system with 500 IRIS diallers polling at
60s intervals will be about 40Mbyte.
It is recommended that log files should be regularly archived to another
medium so the amount actually held on a Polling Engine at any one
time is minimised.
3) Speed of the IP link into the Polling Engine.
In practice this is most often the main system bottleneck. Each poll
requires the transfer of about 250 Bytes (2000 Bits) of data in each
direction. Ideally the link should be symmetrical in bandwidth (i.e. same
speed in both directions), or at least the sizing should be based on the
bandwidth available on the lowest speed direction.
Each alarm transmission also requires the same amount of data
transfer, but typically the number of alarm transmissions is extremely
small compared to the number of polls. Hence alarms are not normally
significant in sizing calculations.
The diagram below shows the bandwidth (in K bits per second)
recommended for different numbers of diallers, depending on the
polling frequency. Note – this assumes that the number of alarm
messages is not significant, as noted above.
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