As someone who has run colo facilities before:
It should be made completely clear during customer onboarding that the facility
operator can temporarily shut down a power feed at any time. Advance warning
should be desirable but optional.
If there is risk involved in doing that, it’s your job to mitigate it. The
facility operator doesn’t know which bits of equipment in your tenancy are
critical, and they’ve already told you to dual-feed where possible and use a
rack-mount ATS for single-corded equipment.
Power work should be done during business hours, because it’s almost impossible
to get emergency support or source replacement equipment out of hours.
If it isn’t safe to take a power feed offline during business hours, then you
(the customer) have a design problem to solve.
> On Aug 10, 2017, at 6:56 AM, Nathan Brookfield
> <nathan.brookfi...@simtronic.com.au> wrote:
> 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 [mailto:ausnog-boun...@lists.ausnog.net] On Behalf Of Chad Kelly
> Sent: Thursday, August 10, 2017 2:54 PM
> To: firstname.lastname@example.org; ausnog-requ...@lists.ausnog.net
> Subject: Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance -, 15th
> On 8/10/2017 10:13 AM, ausnog-requ...@lists.ausnog.net 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
> Web www.cpkws.com.au
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