Critical IT facilities have become an important pillar of today's enterprises. Critical systems are any systems whose failure will have a significant impact on the business operations of the enterprise. We have experience in providing mission-critical solutions for different customers. The scope of the project includes enterprise data centers, website hosting services, hosting facilities, disaster recovery centers, bank trading halls, point-of-presence POP facilities, digital transmission installation equipment, network operation centers and call centers. Usually, the losses caused by the failure of critical systems often exceed the cost of the system itself. The key factors of the system include: Reliability Operability Effectiveness Maintainability Safety Security