This seems reasonable? As long as no single Data Hall has both A and B
feeds removed simultaneously, that seems normal. Doing B on Hall 2 and A on
Hall 3 on the same day does seem slightly adventurous, but not entirely
unreasonable (mostly in terms of if something goes bad in both, staff get
stretched thin remediating issues).

A and B feeds are designed to provide redundancy to equipment, allowing one
feed to fail and systems to continue on the other. Anything mission
critical should be able to draw from either feed as required (dual PSU),
and if there is a power deficit on one feed (causing circuits to trip),
that would imply the circuits are incorrectly sized?

In addition, anything mission critical with a single power supply would be
on an ATS you would assume, or a pair of equivalent devices installed with
one on each rail?

Things break in datacentres, planned maintenance happens sometimes, better
than no maintenance at all :) The fact they are notifying you is better
than not, and it being scheduled is probably still better than unscheduled
:) (easier to ensure sufficient staffing to keep a close eye on things)

Nathan.

On Wed, Aug 9, 2017 at 3:43 PM, Shaun McGuane <sh...@rackcentral.com> wrote:

> Here is the entire scheduled maintenance windows for all the halls we
> occupy.
>
>
>
> DataHall 2
>
> A Feed - Tuesday 8th August 2017 07:00 UTC +10 until 16:00 UTC +10.
> B Feed - Tuesday 15th August 2017 07:00 UTC +10 until 16:00 UTC +10.
>
>
>
> DataHall 3
>
> A Feed - Tuesday 15th August 2017 07:00 UTC +10 until 16:00 UTC +10
> B Feed - Monday 14th August 2017 07:00 UTC +10 until 16:00 UTC +10
>
>
>
> DataHall 4
>
> B Feed - Tuesday 15th August 2017 07:00 UTC +10 until 16:00 UTC +10.
>
>
>
> ·         So looks like no power on 3 data halls B feeds on the same day.
>
> ·         Data Hall 2 was scheduled for A rail on the 8th of August but
> has been re-scheduled with no new date of works.
>
> ·         Data Hall 3 was scheduled for A rail on the
>
>
>
> Problem is that I have 3x separate dates on 3 separate e-mails for Data
> Hall 3 and I have requested a revised clarification
>
> Just now on the above as there has already been re-schedules for Data Hall
> 2 and 3.
>
>
>
> This feels like it’s going sideways and it has not even started.
>
>
>
> Regards
>
> Shaun
>
>
>
>
>
> *From:* AusNOG [mailto:ausnog-boun...@lists.ausnog.net] *On Behalf Of *Murat
> Sener
> *Sent:* Wednesday, 9 August 2017 3:20 PM
> *To:* Matthew VK3EVL <hit...@itglowz.com>; ausnog@lists.ausnog.net
>
> *Subject:* Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance -
> 15th August
>
>
>
> We have been told only Feed B in Data hall 2 will be effected as per
> original schedule and Feed A is yet to be rescheduled.
>
>
>
>
>
>
>
> *Murat Sener*     Datacentre Manager
>
> *PREMIER* Technology Solutions
> *P. *1300 76 76 48    *F. *1300 76 76 49    *M. *0450 604 350
>
>
>
> *How am I doing? Let us know!*
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>
>
> <https://www.crewhu.com/survey.html?crewHuID=qm0Hxbzstp&employeeID=rLeIz2SkIa&type=signat&rating=-5>
>
>
>
> *From:* AusNOG [mailto:ausnog-boun...@lists.ausnog.net
> <ausnog-boun...@lists.ausnog.net>] *On Behalf Of *Matthew VK3EVL
> *Sent:* Wednesday, 9 August 2017 3:13 PM
> *To:* ausnog@lists.ausnog.net
> *Subject:* Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance -
> 15th August
>
>
>
> What about both feeds happening on the same day at the same time?
>
>
>
> On 9/08/2017 2:55 PM, Shaun McGuane wrote:
>
> HI Damien,
>
>
>
> My apologies that’s correct – but isn’t anyone concerned about the works
> being completed during business hours?
>
> What about increased loading of the active rail once one of them is
> switched off for these works?
>
>
>
> Regards
>
> Shaun
>
>
>
>
>
> *From:* Damien Gardner Jnr [mailto:rend...@rendrag.net
> <rend...@rendrag.net>]
> *Sent:* Wednesday, 9 August 2017 2:39 PM
> *To:* <ausnog@lists.ausnog.net> <ausnog@lists.ausnog.net>
> <ausnog@lists.ausnog.net> <ausnog@lists.ausnog.net>; Shaun McGuane
> <sh...@rackcentral.com> <sh...@rackcentral.com>
> *Subject:* Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance -
> 15th August
>
>
>
> It says 7am -> 4pm in what you quoted? (UTC+10 is AEST)
>
>
>
> On Wed, 9 Aug 2017 at 2:36 pm, Shaun McGuane <sh...@rackcentral.com>
> wrote:
>
> HI Noggers,
>
>
>
> Has anyone seen this scheduled maintenance notification happening next
> week?
>
> They maybe upgrading feeds or boards throughout the datacentre – has
> everyone seen this notification of works?
>
> It appears to be happening starting 5PM through to 2AM AEST for all
> Datahalls on the same date.
>
>
>
>
>
> *WHAT:*
> NEXTDC M1 Melbourne data centre, with the assistance of specialist
> contractors, will conduct offline preventative electrical maintenance work
> on high-voltage and low-voltage main isolators. This will affect A and B
> feeds to the racks in Data Hall 2/3/4 on the 15th of August.
>
> *WHEN:*
> A Feed - Tuesday 15th August 2017 07:00 UTC +10 until 16:00 UTC +10.
> B Feed - Tuesday 15th August 2017 07:00 UTC +10 until 16:00 UTC +10.
>
> *HOW AM I AFFECTED?*
> Due to the nature of the work a single feed will be removed as per the
> dates and times above. We recommend that customers balance the power
> between both power rails to minimise impact during this period. If you have
> single feed devices we recommend you:
>
>
>
> Regards
>
> Shaun
>
>
>
>
>
>
>
> _______________________________________________
> AusNOG mailing list
> AusNOG@lists.ausnog.net
> http://lists.ausnog.net/mailman/listinfo/ausnog
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> --
>
> Damien Gardner Jnr
> VK2TDG. Dip EE. GradIEAust
> rend...@rendrag.net -  http://www.rendrag.net/
> --
> We rode on the winds of the rising storm,
>  We ran to the sounds of thunder.
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