<div dir="ltr">Perhaps another avenue to explore could be SSHD's (a hybrid of SSDs and HDD's). They would cost significantly less than an SSD (a 500GB SSHD retails $80), yet meager on power consumption about 2.5-3W better than an HDD, 1-1.5W worse than an SSD.</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Aug 17, 2013 at 5:35 AM, Anish Mangal <span dir="ltr"><<a href="mailto:anish@activitycentral.com" target="_blank">anish@activitycentral.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im"><p><br>
On Aug 17, 2013 5:02 AM, "Adam Holt" <<a href="mailto:holt@laptop.org" target="_blank">holt@laptop.org</a>> wrote:<br>
><br>
> On Sat, Aug 17, 2013 at 2:16 AM, Jerry Vonau <<a href="mailto:jvonau@shaw.ca" target="_blank">jvonau@shaw.ca</a>> wrote:<br>
>><br>
>> On Sat, 2013-08-17 at 07:40 +0200, Tony Anderson wrote:> By the way, the need for the school server is closer to 50 hours per<br>
>><br>
>> > week than 24/7. Normally it needs to be booted only during the hours<br>
>> > when children are in school.<br>
>><br>
>> Valid point, that should be taken into account when calculating total<br>
>> power requirements.<br>
><br>
><br>
> Certainly this changes dramatically in orphanage-school environments in Haiti, where I and volunteers are finding newfound success.<br>
><br>
> Kids need to read in the evenings (and unforeseen times) on their XOs, from <a href="http://internet-in-a-box.org" target="_blank">http://internet-in-a-box.org</a> and most importantly much younger material, rare colorful ebooks we've been granted in Creole.</p>
</div><p>I think this may be the case in a few other places as well. For example in Bhagmalpur, the school server isnt deployed at a school but a somewhat central location in the village and the children can access the server anytime, not just during school hours.</p>
<p>Also one might think that the XS consumes negligible power when compared with 50 xo laptops but keep in mind that the server needs to come across as an 'always on' appliance, including all the wireless APs. Thus while the laptops might be used for, say 2-3 hours a day. An XS must be kept on always, along with the hard disks, and along with all the wireless APs. In such a scenario I would say the the XS preferably have its own power supply and backup system.</p>
<p></p><div class="im">><br>
> So 100 hours/week or 24x7 appears to be the need (in this dominant Haiti use case) across the growing number of "true community schools" where we're working with in Haiti, some orphanages, some not. This is certainly a change from when Tony helped us so much in Haiti 2 years ago, as 1 unique school. Now Haitian schools are ask us for "digital library" service morning, afternoon and evening.<br>
><br>
> And while we're certainly not always able to provide this, George Hunt and others are doing our best to MoE (movin' our electrons ;) when the Right to Read is so central to so many things. EG. we have 5000 books sitting in a warehouse near LA that tragically cannot be shipped to Haiti due to shipping costs -- meanwhile lowpower XS(CE) digital libraries purring through most evenings appear to be unlocking this central problem, long before the boat arrives from LA years later.<br>
><br>
> --<br>
> Unsung Heroes of OLPC, interviewed live @ <a href="http://unleashkids.org" target="_blank">http://unleashkids.org</a> !<br>
><br></div><div class="im">
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</blockquote></div><br></div>