School server manual: Difference between revisions
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==Hardware== |
==Hardware== |
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Adequate power for a school server is often difficult to achieve. The selection of the school server hardware should take into account |
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*How much power is available during a 24 hour period? Will the server be connected to the grid? Is the grid reliably on during school hours? If not, how big does the battery need to be to supply power during school hours? |
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*How many XO's will be connected. A low power 30 watt Atom processor, such as the Solid Logic http://www.logicsupply.com/products/atom_jt01s can support up to 60-100 students. An 80 watt core i3 64bit processor might support 250. |
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*The power consumption of the server times the number of hours in the school day will determine the number of watt-hours that must be stored in a deep-cycle storage battery. Batteries are usually rated in Ampere-hours. A 12 volt battery with a 100 Amp-hour capacity, holds 1200 watt-hours. Batteries last longer if they are cycled through only about 50% of their total capacity. So you can use about 600 watt-hours from a 100AHr battery. This can keep a 60 watt server alive for 10 hours, or a 30 watt server for 20 hours. |
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==Installation== |
==Installation== |
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==Configuration== |
==Configuration== |
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Revision as of 19:24, 6 April 2012
Hardware
Adequate power for a school server is often difficult to achieve. The selection of the school server hardware should take into account
- How much power is available during a 24 hour period? Will the server be connected to the grid? Is the grid reliably on during school hours? If not, how big does the battery need to be to supply power during school hours?
- How many XO's will be connected. A low power 30 watt Atom processor, such as the Solid Logic http://www.logicsupply.com/products/atom_jt01s can support up to 60-100 students. An 80 watt core i3 64bit processor might support 250.
- The power consumption of the server times the number of hours in the school day will determine the number of watt-hours that must be stored in a deep-cycle storage battery. Batteries are usually rated in Ampere-hours. A 12 volt battery with a 100 Amp-hour capacity, holds 1200 watt-hours. Batteries last longer if they are cycled through only about 50% of their total capacity. So you can use about 600 watt-hours from a 100AHr battery. This can keep a 60 watt server alive for 10 hours, or a 30 watt server for 20 hours.