<div dir="ltr">IMHO<div><br><div>Avoid that auto power-transfer stuff in rack if you can. Those devices are best used only for low end boxes like NTU's/etc with which you can only ever install/utilise a single box at a time.</div>
<div><br></div><div><div>Buy equipment which has dual PSU's as an option in preference, but don't mandate it or mandate buying the two power supplies. Mandating it will just mean you're wasting part of your budget unnecessarily on every single purchase as you may force yourself to buy bigger boxes than required; and/or buy more PSU's than you need.</div>
</div><div><br></div><div>Avoid *depending* on dual PSU's if you can, e.g. don't design anything with the assumption having two power supplies in a box will keep everything working if there is a loss of power or if one of the PSU's fails.</div>
<div><br></div><div>Design for failure with N+1 redundancy at a system level, e.g. install two or more of every box and use them in active/active or active/standby capacities. If you do that you won't necessarily require two power supplies in each to achieve a very high level of availability.</div>
<div><br></div><div>Choose to use dual PSU's primarily based on the location and the power infrastructure available, in combination with how many boxes you have. e.g. if you're in a crappy DC where they can't deliver access to two genuinely independent sources of power the value of having two PSU's is greatly reduced regardless of how many many boxes you've installed.</div>
<div><br></div><div>Read up on HA concepts if you're not sure what you need or why.</div><div><br></div><div>13 years old now but this book is still handy and the concepts still hold true,</div><div><br></div><div><a href="http://www.ciscopress.com/store/high-availability-network-fundamentals-9781587130175">http://www.ciscopress.com/store/high-availability-network-fundamentals-9781587130175</a><br>
</div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On 24 April 2014 11:02, Tony de Francesco <span dir="ltr"><<a href="mailto:tonyd@pue.com.au" target="_blank">tonyd@pue.com.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Alex,<br>
<br>
If you happen to end up with a piece of kit that is single corded only you<br>
can buy aftermarket dual cord interface kits that have an internal Auto<br>
Transfer Switch.<br>
<br>
I saw some very cool stuff recently from Zonit<br>
(<a href="http://www.zonit.com/micro-ats/" target="_blank">http://www.zonit.com/micro-ats/</a>)<br>
<br>
<br>
Kind Regards<br>
<span class=""><font color="#888888"><br>
Tony de Francesco<br>
</font></span><div class="im"><br>
<br>
-----Original Message-----<br>
From: AusNOG [mailto:<a href="mailto:ausnog-bounces@lists.ausnog.net">ausnog-bounces@lists.ausnog.net</a>] On Behalf Of Alex<br>
Samad - Yieldbroker<br>
Sent: Thursday, 24 April 2014 10:47 AM<br>
To: <a href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a><br>
Subject: [AusNOG] Question about hardware spec for a DC<br>
<br>
</div><div class=""><div class="h5">A question for the list.<br>
<br>
When you buy equipment for a DC, would you expect it to come with dual<br>
power supplies, either as an option or as a standard?<br>
<br>
<br>
Alex<br>
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</div></div></blockquote></div><br></div></div></div>