[Server-devel] Server-devel Digest, Vol 76, Issue 21

[Jerry Vonau]

On Sat, 2013-08-17 at 05:49 +0200, Tony Anderson wrote:
> Hi,
> 
> What is the disk capacity required by internet-in-a-box?
> 

600-700 gigs

> The purpose of the server is to deliver the information not available 
> from the internet.
> 

Yup, or when your offline.

> The cost of a UPS which is required for a system on the grid is $80-100.
> 

Think the issue is mainly about off-grid systems, those are usually 12v.
What would be neat is if there was a power supply that you could replace
in your standard PC that used 12v as the supply voltage. Anybody know of
a manufacture that supplies one? I'd hate to see what the size of the
battery pack and the recharging requirements needed of the
solar/wind/<insert others> recharging system that would be needed to run
such a beast.

> In my experience, there is need for one school server at a school 
> supporting 30-200 XOs.

Know of any low power devices that you might recommend for off-grid use?

Jerry

> 
> Tony
> 
> On 08/17/2013 03:02 AM, server-devel-request at lists.laptop.org wrote:
> >>The average difference between power consumption of an SSD and a HDD is
> >>about 4W. [1][2]
> >>
> >>Now considering the environments we're gonna head into we're looking at
> >>typically 1-3 days of power backup for the server (lets average out at 2).
> >>
> >>That means, the battery backup needed is:
> >>4 * 24 * 2 = 192 W-hr
> >>
> >>*That comes out to roughly $25-35 in battery costs*  (again based on quick
> >>google searches for battery costs). *If you want a longer life from
> >>you're battery, you're looking at about $50-60 in battery costs.*
> >>
> >>Now if we're also giving solar backup, based on the calculator here
> >>[3] we're going to need about a 25-30W solar panel (for just those 4 extra
> >>watts). Again, google tells me that *such panels retail for about $65-80.*
> >>*
> >>*
> >>*So, on average we'll save $100-$130 on TCO (total cost of ownership), if
> >>we intend to provide an SSD as opposed to an HDD, considering the server
> >>runs 24x7 and 2 days of backup is needed.*
> >>*
> >>*
> >>On top of that, you're looking at less failures, a better operating
> >>temperature range, and more durability.
> 
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