Reliability and Recovery
234 Avaya Application Solutions IP Telephony Deployment Guide
S8700 Server Complex
The high availability philosophy is scrupulously implemented the Avaya S8700 server complex:
●
Linux is the operating system (OS) for many reasons:
- Provides access to full source for quicker bug-fix turnaround
- Allows easy system customization for high availability enhancements
- Exhibits fewer known security flaws than other OSs, and allows customization for added
security features
●
Two servers with a memory shadowing link allow:
- One processor to take over when the other fails.
- Simple duplication of all other server components (for example, modem, disk, or
memory) to eliminate a single point of failure.
- Upgrades with insignificant time out of service.
●
High availability enhancements:
- Software sanity is continuously evaluated. Any insanity (due to unexpected conditions) is
detected, and the offending software is forced to go through escalating levels of recovery
until finally the entire system can switch over to a standby processor.
- Disks are partitioned to keep most of the variable information away from the invariant,
and to allow for automatic recovery if newly loaded software fails.
- All event logs are proactively scanned for potential service-affecting items. If found,
alarms are generated. If necessary, a service dispatch is launched.
- Applications running on the OS are thoroughly pr-tested to assure proper performance.
This OS is closed to any applications other than those provided by the manufacturer to
avoid interference of operation. Alarms can be generated if any untested software is
loaded on the system.
- Customers and technicians (in most cases) can access the operating system shell
directly, providing protection from inadvertent adverse alterations to the system.
- Enhanced tools allow secure, remote, nonstop system debugging and unattended data
collection.
Summary of Contents for Application Solutions
Page 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Page 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Page 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Page 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Page 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Page 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...