Difference: Ups (2 vs. 3)

Revision 32010-05-27 - WilliamSeligman

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META TOPICPARENT name="Computing"

Nevis UPS Management

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    • More than one system can monitor the UPS status simultaneously. This is especially useful if the UPS supplies power to a network switch, as noted above.
    • It allows a systems administrator to reboot a system remotely, by shutting off the UPS's power via the management card. This has already proved useful when a system has gotten into a state in which it was not possible to log in; the system can be rebooted without waiting for the sysadmin to travel to Nevis.

      For this reason, all the major servers (including the mail server) have UPSes with SNMP management cards.

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  • The SNMP management cards are all on the private network, while many of the systems that monitor them are on the public network. All public<->private network traffic goes through the firewall. That means if the firewall goes down, the systems would lose connection to important UPSes. So if the firewall battery goes critical, all the Nevis cluster systems shut down (with the exceptions noted below).
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  • The SNMP management cards are all on the private network, while many of the systems that monitor them are on the public network. All public<->private network traffic goes through the firewall. That means if the firewall goes down, the systems would lose connection to important UPSes. So if the firewall battery goes critical, all the Nevis cluster systems shut down (with the exceptions noted below).
 
  • As of May-2007, the UPS attached to the firewall only supplies power for about 13 minutes. Given the previous point, this means that ten minutes into a power outage, the systems will start shutting themselves down; the three-minute buffer is to give time for the systems to shut down cleanly.
 
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