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.hi...@serversaustralia.com.au
<mailto:jared.hi...@serversaustralia.com.au>
------------------------------------------------------------------------
*From:* AusNOG <ausnog-boun...@lists.ausnog.net> on behalf of Simon
Cooper <s...@inbox.com>
*Sent:* Thursday, August 10, 2017 8:39:13 AM
*To:* ausnog@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:* nat...@nightsys.net
*Sent:* Thu, 10 Aug 2017 05:39:02 +1000
*To:* sh...@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
<sh...@rackcentral.com <mailto: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 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-boun...@lists.ausnog.net
<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
<mailto:hit...@itglowz.com>>; ausnog@lists.ausnog.net
<mailto: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
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*From:*AusNOG [mailto:ausnog-boun...@lists.ausnog.net
<mailto:ausnog-boun...@lists.ausnog.net>] *On Behalf Of
*Matthew VK3EVL
*Sent:* Wednesday, 9 August 2017 3:13 PM
*To:* ausnog@lists.ausnog.net <mailto: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]
*Sent:* Wednesday, 9 August 2017 2:39 PM
*To:* <ausnog@lists.ausnog.net>
<mailto:ausnog@lists.ausnog.net> <ausnog@lists.ausnog.net>
<mailto:ausnog@lists.ausnog.net>; Shaun McGuane
<sh...@rackcentral.com> <mailto: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 <mailto: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
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