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<div class="moz-cite-prefix">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) <br>
<br>
Matt.<br>
<br>
<br>
<br>
<br>
On 10/8/17 1:22 pm, Jared Hirst wrote:<br>
</div>
<blockquote type="cite"
cite="mid:MEXPR01MB16865EEBF3AA88BF8200079ABF880@MEXPR01MB1686.ausprd01.prod.outlook.com">
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charset=windows-1252">
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<span itemprop="creator" itemscope=""
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<div>
<div style="direction:ltr">Hi Simon,</div>
<div><br>
</div>
<div style="direction:ltr">Maybe it could be helpful to the
Ausnog list to point us to that law you refer too?</div>
<div><br>
</div>
<div style="direction:ltr">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.</div>
<div><br>
</div>
<div style="direction:ltr">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.</div>
<div><br>
</div>
<div style="direction:ltr">In any case, it would be
interesting to see the law the requires you to shut down
boards.</div>
<div><br>
</div>
<div class="acompli_signature">Regards,<br>
<br>
Jared Hirst<br>
Servers Australia Pty Ltd<br>
Phone: +61 2 8115 8801<br>
Email: <a dir="ltr"
href="mailto:jared.hirst@serversaustralia.com.au"
moz-do-not-send="true">jared.hirst@serversaustralia.com.au</a></div>
</div>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b> AusNOG
<a class="moz-txt-link-rfc2396E" href="mailto:ausnog-bounces@lists.ausnog.net"><ausnog-bounces@lists.ausnog.net></a> on behalf of Simon
Cooper <a class="moz-txt-link-rfc2396E" href="mailto:spgc@inbox.com"><spgc@inbox.com></a><br>
<b>Sent:</b> Thursday, August 10, 2017 8:39:13 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] NextDC Melbourne - Scheduled
Power Maintenance - 15th August</font>
<div> </div>
</div>
<div>
<div>Thanks guys, appreciate the feedback.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
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.
<div><br>
</div>
<div>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.</div>
<div>
<div><br>
</div>
<div>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).</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Simon</div>
<div>COO, NEXTDC</div>
<div><br>
<blockquote style="padding-left:5px; margin-left:5px;
border-left:#0000ff 2px solid; margin-right:0px">
<div class="msgHeaders">-----Original Message-----<br>
<b>From:</b> <a class="moz-txt-link-abbreviated" href="mailto:nathan@nightsys.net">nathan@nightsys.net</a><br>
<b>Sent:</b> Thu, 10 Aug 2017 05:39:02 +1000<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:shaun@rackcentral.com">shaun@rackcentral.com</a><br>
<b>Subject:</b> Re: [AusNOG] NextDC Melbourne -
Scheduled Power Maintenance - 15th August<br>
<br>
</div>
<div class="oldBody">
<div>
<div dir="ltr">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).
<div>
<div><br>
</div>
<div>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?
<div><br>
</div>
<div>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?</div>
<div><br>
</div>
<div>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)</div>
<div><br>
</div>
<div>Nathan.</div>
<div><br>
<div>On Wed, Aug 9, 2017 at 3:43 PM, Shaun
McGuane <span dir="ltr"><<a
href="mailto:shaun@rackcentral.com"
target="_blank" moz-do-not-send="true">shaun@rackcentral.com</a>></span>
wrote:<br>
<blockquote>
<div bgcolor="white" lang="EN-AU">
<div>
<p><span>Here is the entire scheduled
maintenance windows for all the
halls we occupy.</span></p>
<p><span> </span></p>
<p><span>DataHall 2</span></p>
<p><span>A Feed - Tuesday 8th August
2017 07:00 UTC +10 until 16:00 UTC
+10.<span><br>
B Feed - Tuesday 15th August
2017 07:00 UTC +10 until 16:00
UTC +10.</span></span><span></span></p>
<p><span> </span></p>
<p><span>DataHall 3</span></p>
<p><span><span>A Feed - Tuesday 15<sup>th</sup> August
2017 07:00 UTC +10 until
16:00 UTC +10<br>
</span>B Feed - Monday 14<sup>th</sup>
August 2017 07:00 UTC +10 until
16:00 UTC +10</span><span></span></p>
<p><span> </span></p>
<p><span>DataHall 4</span></p>
<span>
<p><span>B Feed - Tuesday 15th
August 2017 07:00 UTC +10 until
16:00 UTC +10.</span><span></span></p>
<p><span> </span></p>
</span>
<p><span><span>·<span> </span></span></span><span>So
looks like no power on 3 data
halls B feeds on the same day.
</span></p>
<p><span><span>·<span> </span></span></span><span>Data
Hall 2 was scheduled for A rail on
the 8<sup>th</sup> of August but
has been re-scheduled with no new
date of works.</span></p>
<p><span><span>·<span> </span></span></span><span>Data
Hall 3 was scheduled for A rail on
the
</span></p>
<p><span> </span></p>
<p><span>Problem is that I have 3x
separate dates on 3 separate
e-mails for Data Hall 3 and I have
requested a revised clarification
</span></p>
<p><span>Just now on the above as
there has already been
re-schedules for Data Hall 2 and
3.</span></p>
<p><span> </span></p>
<p><span>This feels like it’s going
sideways and it has not even
started.</span></p>
<p><span> </span></p>
<p><span>Regards</span></p>
<p><span>Shaun</span></p>
<p><span> </span></p>
<p><span> </span></p>
<div>
<div>
<p><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> AusNOG [mailto:<a
href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank"
moz-do-not-send="true">ausnog-bounces@lists.<wbr>ausnog.net</a>]
<b>On Behalf Of </b>Murat
Sener<br>
<b>Sent:</b> Wednesday, 9
August 2017 3:20 PM<br>
<b>To:</b> Matthew VK3EVL <<a
href="mailto:hitman@itglowz.com" target="_blank" moz-do-not-send="true">hitman@itglowz.com</a>>;
<a
href="mailto:ausnog@lists.ausnog.net"
target="_blank"
moz-do-not-send="true">ausnog@lists.ausnog.net</a></span></p>
<div>
<div><br>
<b>Subject:</b> Re: [AusNOG]
NextDC Melbourne - Scheduled
Power Maintenance - 15th
August</div>
</div>
</div>
</div>
<div>
<div>
<p> </p>
<p><a
name="m_-6390079169127962130__MailEndCompose"
moz-do-not-send="true"><span>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.</span></a></p>
<p><span> </span></p>
<p><span> </span></p>
<p><span> </span></p>
<div>
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<p><span><img
src="cid:part7.034C1A85.3259A5D8@spectrum.com.au"
class=""
width="56"
height="72"></span></p>
</td>
<td>
<p><b><span>Murat Sener</span></b><span> </span><span>Datacentre
Manager</span><span></span></p>
</td>
</tr>
<tr>
<td>
<p><b><span>PREMIER</span></b><span>
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<p><b><span>How am I
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<p><span> </span></p>
<div>
<div>
<p><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> AusNOG [<a
href="mailto:ausnog-bounces@lists.ausnog.net"
target="_blank"
moz-do-not-send="true">mailto:ausnog-bounces@lists.<wbr>ausnog.net</a>]
<b>On Behalf Of </b>Matthew
VK3EVL<br>
<b>Sent:</b> Wednesday, 9
August 2017 3:13 PM<br>
<b>To:</b> <a
href="mailto:ausnog@lists.ausnog.net"
target="_blank"
moz-do-not-send="true">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re:
[AusNOG] NextDC Melbourne
- Scheduled Power
Maintenance - 15th August</span></p>
</div>
</div>
<p> </p>
<p>What about both feeds happening
on the same day at the same
time?</p>
<p> </p>
<div>
<p>On 9/08/2017 2:55 PM, Shaun
McGuane wrote:</p>
</div>
<blockquote>
<p><span>HI Damien,</span></p>
<p><span> </span></p>
<p><span>My apologies that’s
correct – but isn’t anyone
concerned about the works
being completed during
business hours?</span></p>
<p><span>What about increased
loading of the active rail
once one of them is switched
off for these works?</span></p>
<p><span> </span></p>
<p><span>Regards</span></p>
<p><span>Shaun</span></p>
<p><span> </span></p>
<p><span> </span></p>
<p><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Damien Gardner
Jnr [<a
href="mailto:rendrag@rendrag.net"
target="_blank"
moz-do-not-send="true">mailto:rendrag@rendrag.net</a>]
<br>
<b>Sent:</b> Wednesday, 9
August 2017 2:39 PM<br>
<b>To:</b> <a
href="mailto:ausnog@lists.ausnog.net"
target="_blank"
moz-do-not-send="true"><ausnog@lists.ausnog.net></a>
<a
href="mailto:ausnog@lists.ausnog.net"
target="_blank"
moz-do-not-send="true"><ausnog@lists.ausnog.net></a>;
Shaun McGuane
<a
href="mailto:shaun@rackcentral.com"
target="_blank"
moz-do-not-send="true"><shaun@rackcentral.com></a><br>
<b>Subject:</b> Re: [AusNOG]
NextDC Melbourne - Scheduled
Power Maintenance - 15th
August</span></p>
<p> </p>
<div>
<div>
<p>It says 7am -> 4pm in
what you quoted? (UTC+10
is AEST)</p>
</div>
<p> </p>
<div>
<div>
<p>On Wed, 9 Aug 2017 at
2:36 pm, Shaun McGuane
<<a
href="mailto:shaun@rackcentral.com"
target="_blank"
moz-do-not-send="true">shaun@rackcentral.com</a>>
wrote:</p>
</div>
<blockquote>
<div>
<div>
<p>HI Noggers,</p>
<p> </p>
<p>Has anyone seen
this scheduled
maintenance
notification
happening next week?</p>
<p>They maybe
upgrading feeds or
boards throughout
the datacentre – has
everyone seen this
notification of
works?</p>
<p>It appears to be
happening starting
5PM through to 2AM
AEST for all
Datahalls on the
same date.</p>
<p> </p>
<p> </p>
<p><b><span>WHAT:</span></b><br>
<span>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.<br>
<br>
</span><b><span>WHEN:</span></b><span><br>
A Feed - Tuesday
15th August
2017 07:00 UTC +10
until 16:00 UTC
+10.<br>
B Feed - Tuesday
15th August 2017
07:00 UTC +10
until 16:00 UTC
+10.</span><br>
<br>
<b><span>HOW AM I
AFFECTED?</span></b><span><br>
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:</span></p>
<p> </p>
<p>Regards</p>
<p>Shaun</p>
<p><span> </span></p>
<p> </p>
<p> </p>
</div>
</div>
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</div>
</div>
<div>
<p>-- </p>
</div>
<div>
<div>
<p>Damien Gardner Jnr<br>
VK2TDG. Dip EE. GradIEAust<br>
<a
href="mailto:rendrag@rendrag.net"
target="_blank"
moz-do-not-send="true">rendrag@rendrag.net</a>
- <a
href="http://www.rendrag.net/"
target="_blank"
moz-do-not-send="true">http://www.rendrag.net/</a><u><br>
</u>--<br>
We rode on the winds of
the rising storm,<br>
We ran to the sounds of
thunder.<br>
We danced among the
lightning bolts,<br>
and tore the world
asunder</p>
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