High Availability Environments cs5493/7493

High Availability Requirements Achieving high availability Redundancy of systems Maintenance Backup & Restore

Redundancy Power HVAC Servers Data Center Network hardware Data Storage

Power Redundancy UPS for Computer Hardware Data center lighting Fire suppression HVAC Security systems

Power Redundancy

HVAC Redundancy HVAC systems are like any other system, they require regular maintenance and can fail unexpectedly. A backup system would be required during HVAC service or if the primary HVAC system fails.

HVAC Redundancy Multiple chiller units for the data center If a chiller fails, the remaining units should be designed to handle the higher capacity requirements.

Server Redundancy Previous generation computer equipment is a candidate for the backup system. Extra power supply units for critical servers. The power supply is a system with a lower MTF compared to most solid state components. Keep a reliable disk image or backup of your critical server systems on hand.

Server Redundancy Server image/backup (disk image/image) considerations Keep on a read only media Should be updated and tested periodically Requires resources (time & effort) to guarantee the effectiveness of the image/backup. Public servers are exposed to outside attacks, and may be more likely to require an image or redundant system as backup.

Data Center Redundancy Not every operation can afford a redundant data center. Redundant centers require reliable communication If no redundant data center is possible, backups stored off-site protect from total data loss.

Network Redundancy Some network equipment is inexpensive, consider keeping extra hardware, cables, and connectors. Routers Switches etc

Data Redundancy Using: RAID Backup & Restore