That's all well and good but when you're paying a premium price for services of 
this fashion you expect a certain level of service.  There is a risk no matter 
what when switching from power supplies taking extra load they would not 
usually take as well as swing load issues with PDU's.

I completely agree with your sentiment but the risk is not to be ignored 
especially during those times.

Kindest Regards,
Nathan Brookfield (VK2NAB)

-----Original Message-----
From: AusNOG [] On Behalf Of Chad Kelly
Sent: Thursday, August 10, 2017 2:54 PM
Subject: Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance -, 15th 

On 8/10/2017 10:13 AM, wrote:
>  From the latest update today, It appears that most of the works are 
> being postponed for the time being
> Not all devices within racks support 2 feeds and planning is involved 
> with these devices, which is why it is crucial to receive accurate 
> information about any pending outages or upgrades to the NextDC DataCentres 
> which affect services.
If these services are mission critical then you really should have duel PSU 
units, so that when one feed gets taken offline the equipment automatically 
switches to the other feed. They won't just disconnect both feeds at once 
because that would be stupid and if the entire DC was offline for too much time 
then that would put the owners in a rather awkward situation legally, as after 
say 8 or 10 hours of downtime it wouldn't be good for the owners lets put it 
that way.
If the single PSU units are a part of a customers co-located equipment then 
really your terms of service agreement should exclude liability under your 
maintenance clauses.
I don't understand why anyone would be using single PSU equipment in a DC 
environment now a days when you can buy refurbished servers that come with two 
PSU as standard even when you buy them without raid.
Also for anything that is really really mission critical you should have it 
hosted in multiple datacentres anyway so if something stupid does happen that 
you can't control you at least still have services online as the load balanced 
services would just switch.
Regards Chad.

Chad Kelly
CPK Web Services
Phone 03 5273 0246

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