[AusNOG] NextDC Melbourne - Scheduled Power Maintenance - 15th August
Matt Perkins
matt at spectrum.com.au
Thu Aug 10 14:47:01 EST 2017
Smells of them having to lift the supply neutral to the input of the UPS
stacks. This would require a shutdown of the entire eqipment if the
Natural earth bond needs to be split for whatever reason. (Although I
have done a temporary bond in DC's before to keep the UPS array going
but a lot of engineers get skittish about that especially if HV is
involved)
Matt.
On 10/8/17 1:22 pm, Jared Hirst wrote:
> Hi Simon,
>
> Maybe it could be helpful to the Ausnog list to point us to that law
> you refer too?
>
> As I personally have never heard or seen this done in any DC in
> Australia, or the world in the past 15 years I have been housing gear
> in Data Centres.
>
> I agree that gear should have 2N, and it doesn’t affect me, but there
> are people that have equipment that have single fed devices, and I
> believe you don’t allow self installed STS devices to be installed? I
> could be wrong.
>
> In any case, it would be interesting to see the law the requires you
> to shut down boards.
>
> Regards,
>
> Jared Hirst
> Servers Australia Pty Ltd
> Phone: +61 2 8115 8801
> Email: jared.hirst at serversaustralia.com.au
> <mailto:jared.hirst at serversaustralia.com.au>
> ------------------------------------------------------------------------
> *From:* AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Simon
> Cooper <spgc at inbox.com>
> *Sent:* Thursday, August 10, 2017 8:39:13 AM
> *To:* ausnog at lists.ausnog.net
> *Subject:* Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance
> - 15th August
> Thanks guys, appreciate the feedback.
>
> At NEXTDC we work very hard to keep critical infrastructure
> maintenance that impacts racks or the environment within the data hall
> to an absolute minimum.
>
> However, some works are required to happen from time to time by law
> and one of those activities is a de-energisation and inspection of
> each of our major switchboards. This is all about ensuring that the
> electrical system is safe, and is an unavoidable piece of work.
> Rightly so.
>
> Every rack in a NEXTDC data centre has 2N power feeds offered to it,
> and we highly recommend that they are used for every device in the
> rack. This occasional maintenance is one of the many reasons we
> provide this capability. Any device using the 2N supplies (aka A & B
> feeds) will simply see its power swing from one feed to the other.
> Any rack that is drawing no more that its contracted power level will
> have no issue when all devices move from A to B or vice versa.
>
> Our notifications were made well in advance, as we want to give
> customers time to consider the management of these works and we don't
> assume that every rack is perfectly deployed: We are here 24/7 to
> assist customers with rack inspections or specific circuit down tests
> or maybe a controlled move prior to the day (e.g. for devices that are
> single fed).
>
> Also, as we work though those discussions with customers we understand
> the timing in relation to their businesses, and we work very hard to
> coordinate schedules despite each switch board supporting many
> different customers and customer instances across the data centre.
> Occasionally that means we have to make a difficult decisions which
> may result in schedule changes. When that does happen, we do not
> compromise our notification periods.
>
> I'll be happy to discuss these works with anyone - probably best
> offline or on the phone - but trust me when I say we are doing our
> absolute best to keep your data centre operating safely and reliably
> for many years to come.
>
> Thanks,
> Simon
> COO, NEXTDC
>
> -----Original Message-----
> *From:* nathan at nightsys.net
> *Sent:* Thu, 10 Aug 2017 05:39:02 +1000
> *To:* shaun at rackcentral.com
> *Subject:* Re: [AusNOG] NextDC Melbourne - Scheduled Power
> Maintenance - 15th August
>
> 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
> <shaun at rackcentral.com <mailto:shaun at 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 15^th August 2017 07:00 UTC +10 until
> 16:00 UTC +10
> B Feed - Monday 14^th 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 8^th 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-bounces at lists.ausnog.net
> <mailto:ausnog-bounces at lists.ausnog.net>] *On Behalf Of *Murat
> Sener
> *Sent:* Wednesday, 9 August 2017 3:20 PM
> *To:* Matthew VK3EVL <hitman at itglowz.com
> <mailto:hitman at itglowz.com>>; ausnog at lists.ausnog.net
> <mailto:ausnog at 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
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> <https://www.crewhu.com/survey.html?crewHuID=qm0Hxbzstp&employeeID=rLeIz2SkIa&type=signat&rating=-5>
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> *From:*AusNOG [mailto:ausnog-bounces at lists.ausnog.net
> <mailto:ausnog-bounces at lists.ausnog.net>] *On Behalf Of
> *Matthew VK3EVL
> *Sent:* Wednesday, 9 August 2017 3:13 PM
> *To:* ausnog at lists.ausnog.net <mailto:ausnog at 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:rendrag at rendrag.net]
> *Sent:* Wednesday, 9 August 2017 2:39 PM
> *To:* <ausnog at lists.ausnog.net>
> <mailto:ausnog at lists.ausnog.net> <ausnog at lists.ausnog.net>
> <mailto:ausnog at lists.ausnog.net>; Shaun McGuane
> <shaun at rackcentral.com> <mailto:shaun at 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
> <shaun at rackcentral.com <mailto:shaun at 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
>
> _______________________________________________
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> --
>
> Damien Gardner Jnr
> VK2TDG. Dip EE. GradIEAust
> rendrag at rendrag.net <mailto:rendrag at rendrag.net> -
> http://www.rendrag.net/_
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--
/* Matt Perkins
Direct 1300 137 379 Spectrum Networks Ptd. Ltd.
Office 1300 133 299 matt at spectrum.com.au
Level 6, 350 George Street Sydney 2000
Spectrum Networks is a member of the Communications Alliance & TIO
*/
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