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< < | To solve this problem, one node has been designated the "wake-up" box. As of Apr-2012 it's hermes01.nevis.columbia.edu , but it could be any node not connected to a UPS. It goes down when power is cut off, comes back up when power is restored. As soon as it comes back up, it sends a wake-up signal to the servers. If a server has IPMI![]() ![]() | |||||||
> > | To solve this problem, one node has been designated the "wake-up" box. As of Apr-2016 it's kennel00.nevis.columbia.edu , but it could be any node not connected to a UPS. It goes down when power is cut off, comes back up when power is restored. As soon as it comes back up, it sends a wake-up signal to the servers. If a server has IPMI![]() ![]() | |||||||
The BIOS of the "wake-up" is set to bring up the system quickly, unlike the BIOSes of the other systems which are set to delay for as long as possible to give the main servers a chance to come back up. This means the "wake-up" box might come up before NIS and NFS is available on the cluster. This seems a reasonable price to pay for having the rest of the cluster come back up in a working state. |
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< < | Power outages are a fact of life at Nevis. It's not unusual to have two or three multi-hour outages per year. | |||||||
> > | Power outages are a fact of life at Nevis. It's not unusual to have two or three multi-hour outages per year. | |||||||
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< < | To protect the systems from surges or equipment damage due to sudden
power loss, all of the computer servers and workstations in the Room
119 computer enclosure at Nevis are protected by uninterruptble power supplies![]() ![]() | |||||||
> > | To protect the systems from surges or equipment damage due to sudden power loss, all of the computer servers and workstations in the Room 119 computer enclosure at Nevis are protected by uninterruptble power supplies![]() ![]() | |||||||
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< < | As you can see from the UPS status page![]() | |||||||
> > | As you can see from the UPS status page![]() | |||||||
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are connected to a UPS; they are not considered "critical" systems. | ||||||||
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< < | As you can see from the UPS status page![]() | |||||||
> > | As you can see from the UPS status page![]() | |||||||
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< < | The software programs used to monitor the UPSes and control the
attached systems are the Network UPS Tools![]() /etc/ups ,
are not accessible to most users. Here's the general policy applied
to configuring NUT on the various systems: | |||||||
> > | The software programs used to monitor the UPSes and control the attached systems are the Network UPS Tools![]() /etc/ups , are not accessible to most users. Here's the general policy applied to configuring NUT on the various systems: | |||||||
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"Wake-up" boxEven with all the preparation described above, there's still a potential problem depending on the length of a power outage.
hermes01.nevis.columbia.edu , but it could be any node not connected to a UPS. It goes down when power is cut off, comes back up when power is restored. As soon as it comes back up, it sends a wake-up signal to the servers. If a server has IPMI![]() ![]() | |||||||
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Nevis UPS ManagementThis page describes how Uninterruptble Power Supplies ("UPS") are monitored at Nevis. There's also a web page on which you can see the current UPS status![]() BackgroundPower outages are a fact of life at Nevis. It's not unusual to have two or three multi-hour outages per year. To protect the systems from surges or equipment damage due to sudden power loss, all of the computer servers and workstations in the Room 119 computer enclosure at Nevis are protected by uninterruptble power supplies![]() ![]() ![]() ConfigurationThe software programs used to monitor the UPSes and control the attached systems are the Network UPS Tools![]() /etc/ups ,
are not accessible to most users. Here's the general policy applied
to configuring NUT on the various systems:
|