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I have a flotsam running using a 32GB super cache msata on the CUI
Inc 2.5A power supply without issue today. My goal is to ensure I
have enough power for the entire stack (the 2.5" SSD drive is only
rated at 1A, so there is plenty left over in the power supply I am
looking at. <br>
<br>
What I am looking for is just a little more experienced input from
someone who may have done something similar.<br>
<br>
The system I am building is for prototyping software for distributed
environments. Think OpenStack, Ceph, HPC, etc.<br>
<br>
<pre class="moz-signature" cols="72">David Byte
Sr. Technology Strategist
Alliances and Integrated Systems
SUSE
<a class="moz-txt-link-abbreviated" href="mailto:dbyte@suse.com">dbyte@suse.com</a>
(P)918.528.4422
<a class="moz-txt-link-abbreviated" href="http://www.suse.com">www.suse.com</a>
<a class="moz-txt-link-freetext" href="https://www.suse.com/partners/integrated-systems/">https://www.suse.com/partners/integrated-systems/</a>
</pre>
<div class="moz-cite-prefix">On 3/26/2015 11:12 AM, Scott Guthrie
wrote:<br>
</div>
<blockquote
cite="mid:CAHOGqUeacxybUWahj3jGM5+4oPXuLBWWL4NS4Fjr=0RaYhDLWQ@mail.gmail.com"
type="cite">
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<div>I can tell you with my Flotsam with a Crucial 240GB SSD
on it (with a Wireless USB Mouse and a Corded Keyboard),
2.5A didn't cut it. I could boot, but with Mint up in
desktop, as soon as I did ANYTHING, the system would crash
(voltage/current sag). Removing the SSD allowed flawless
operation.<br>
<br>
</div>
I have a 3.5 or 4Amp unit now, but I've not tested it yet.<br>
<br>
</div>
I don't think you can power the Flotsam with an SSD (or any
form of Disk) on less than 3 Amps.<br>
<br>
</div>
Scott<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Mar 26, 2015 at 12:07 PM, David
Byte <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:dbyte@suse.com" target="_blank">dbyte@suse.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Good
advice Ken.<br>
<br>
I'm looking to power a stack of up to 8 boards with Flotsam
boards and possibly up to 8 SATA 2.5" SSD drives as well.
So, I am assuming I need to be looking at about 16 devices *
2.5A each @ 5V on a good switching power supply.<br>
<br>
Thoughts of using this: <a moz-do-not-send="true"
href="http://www.mouser.com/ProductDetail/Mean-Well/HSP-250-5/?qs=sGAEpiMZZMsPs3th5F8koANcuRqubmL6N%252bynPk%252b952k%3d"
target="_blank">http://www.mouser.com/ProductDetail/Mean-Well/HSP-250-5/?qs=sGAEpiMZZMsPs3th5F8koANcuRqubmL6N%252bynPk%252b952k%3d</a>
and breaking it out to the 16 device plugs?<span class="im
HOEnZb"><br>
<br>
<br>
David Byte<br>
Sr. Technology Strategist<br>
Alliances and Integrated Systems<br>
SUSE<br>
<a moz-do-not-send="true" href="mailto:dbyte@suse.com"
target="_blank">dbyte@suse.com</a><br>
(P)<a moz-do-not-send="true" href="tel:918.528.4422"
value="+19185284422" target="_blank">918.528.4422</a><br>
<a moz-do-not-send="true" href="http://www.suse.com"
target="_blank">www.suse.com</a><br>
<a moz-do-not-send="true"
href="https://www.suse.com/partners/integrated-systems/"
target="_blank">https://www.suse.com/partners/integrated-systems/</a><br>
<br>
</span>
<div class="HOEnZb">
<div class="h5">
On 3/26/2015 9:50 AM, Ken Tait wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
These boards have a pretty poor power supply to keep
them 'cheap'. That is why they require 5V in instead
of 12V. All of the larger CPU's have a large
instantaneous current draw when they turn on. This
gets worse if you add disk drives or USB peripherals.
The plug in the wall power supplies are poorly
designed, they in fact do NOT handle this kind of
surge well. If you get one to work, it is a random
event. what you really need is a 5V at 5A switching
supply that has a fast rise time to get this to
reliably work.<br>
<br>
If you place an on/off switch in the + power supply
lead and plug the 'plug in the wall' supply in FIRST
before turning it on, you may get better results.<br>
This allows the supply to come up to voltage before
turning on the Max.<br>
<br>
As for the barrel jacks, you can get them from
Digi-Key or Mouser, lots of the surplus houses like
All-Electronics also have them from time to time.<br>
<br>
Hope this helps<br>
Ken<br>
<br>
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