S8700 Multi-Connect And Ip-Connect Software Availability - Avaya Application Solutions Deployment Manual

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Reliability and Recovery
System cold restarts
In this recovery mechanism, processes are still started with the same data and stacks that they
were using prior to the cold restart, but calls are dropped and Port Networks (PNs) are reset,
followed by a port board activation phase of recovery. If three cold restarts are needed within a
15-minute probationary period, the third system cold restart is deemed ineffective, and will
instead be escalated to a Communication Manager reload.
Communication Manager reloads
In this recovery mechanism, all calls are dropped, and all processes that are related to call
processing are stopped and restarted. PN configuration data known as "translations" is reread
from disk, and, as in system cold restarts, PNs are reset, and port boards are activated. If three
Communication Manager reloads are needed within a 10-minute probationary period, the reload
is deemed ineffective, and will instead be escalated to an operating system reboot.
Linux operating system reboots on
S8300/S8700 Media Servers
In this recovery mechanism, all calls are dropped, all processes are killed, and the operating
system is completely rebooted. Processes are then read off disk and loaded into memory,
where recovery then proceeds exactly as it does in Communication Manager reloads. If the
reboot fails after a recent software upgrade, another reboot is attempted, but from a disk
partition containing the previous version of software.
For the S8700 Media Server, this implementation is expected to result in a weighted average of
2 minutes per year or less of call-affecting time out of service that can be attributed to software.

S8700 Multi-Connect and IP-Connect software availability

Table 53: S8700 system software availability
availability based on real time data collected from the S8700 systems in both Multi-Connect and
IP-Connect configuration. Downtime due to system cold restarts, reloads, and Linux OS reboot
and Port Network reset are collected as data for the availability numbers reported.
2 The above reflects availability due to software reliability and recovery only and does not reflect the effects of
hardware failures, network failures, software upgrades, media gateway failures, IP phone failures, or failures
due to improper system configuration
248 Avaya Application Solutions IP Telephony Deployment Guide
on page 249 shows S8700 systems software
2

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