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dedicated servers

Explain: Five Nines ( 99.999% ) Computer / Network Uptime Concept

Q. Some service provider guarantees 99.999% uptime for their service. Can you explain meaning of five nines?
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Debian / Ubuntu Linux Install NTPD To Synchronism Clock With Internet Standard Time Servers

Q. How do I install and configure NTP ( Network Time Protocol ) daemon to keep my dedicated servers clock in sync?
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