[AusNOG] Question about hardware spec for a DC

[Colin Stubbs]

IMHO

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.

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.

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.

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.

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.

Read up on HA concepts if you're not sure what you need or why.

13 years old now but this book is still handy and the concepts still hold
true,

http://www.ciscopress.com/store/high-availability-network-fundamentals-9781587130175


On 24 April 2014 11:02, Tony de Francesco <tonyd at pue.com.au> wrote:

> Alex,
>
> If you happen to end up with a piece of kit that is single corded only you
> can buy aftermarket dual cord interface kits that have an internal Auto
> Transfer Switch.
>
> I saw some very cool stuff recently from Zonit
> (http://www.zonit.com/micro-ats/)
>
>
> Kind Regards
>
> Tony de Francesco
>
>
> -----Original Message-----
> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Alex
> Samad - Yieldbroker
> Sent: Thursday, 24 April 2014 10:47 AM
> To: ausnog at lists.ausnog.net
> Subject: [AusNOG] Question about hardware spec for a DC
>
> A question for the list.
>
> When you buy equipment for a DC, would you expect it to come with dual
> power supplies, either as an option or as a standard?
>
>
> Alex
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