[AusNOG] Question about hardware spec for a DC

[Jonathan Thorpe]

Hi Alex,

While it's generally a good idea to have multiple power supplies and feeds feeding them, the answer to this is really depends on a few factors.

Dual power supplies and dual power feeds feeding them are no guarantee that a single piece of equipment will be able to offer any form of redundancy.

Keeping in mind that devices that employ multiple power supplies ultimately have electronics which manage the two power supplies and are therefore a single point of failure. I've had servers and network gear fail because of faulty distribution boards or a faulty power supply having to be removed from the system for it to power on.

We have quite a few switches that have single power supplies, but in all cases where they're used, hosts that attach to them are multi-homed and switches are powered by separate power feeds.

For situations where you have equipment that only runs a single PSU and yet you have multiple power feeds, you can get 1RU ATS that can immediately switch between feeds. Be aware however that this introduces another mode of failure.

- Jonathan 





-----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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