Dear All

Anyone with single power supply devices please do not look at getting an ATS, 
get a STS !!!

Short version

ATS (Automatic Transfer Switch) will typically break power before it makes, 
thus the connected device could reboot !!

STS (Static Transfer Switch) will make power before it breaks, providing no 
break to the power  !

An example of a recommended device is below

https://www.vertivco.com/en-asia/products-catalog/critical-power/power-transfer-switches/liebert-lts-63-to-400a/

Kindest Regards,

James Braunegg



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From: AusNOG [mailto:ausnog-boun...@lists.ausnog.net] On Behalf Of Matthew Smee
Sent: Thursday, 10 August 2017 12:00 PM
To: ausnog@lists.ausnog.net
Subject: Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance - 15th 
August

+1
Every DC agreement I’ve seen (3) have mentioned that you are responsible for 
supplying it with power and they aren’t responsible if it loses power (i.e. use 
an ATS).

From: AusNOG [mailto:ausnog-boun...@lists.ausnog.net] On Behalf Of Sam Silvester
Sent: Thursday, 10 August 2017 10:14 AM
To: Shaun McGuane <sh...@rackcentral.com<mailto:sh...@rackcentral.com>>
Cc: ausnog@lists.ausnog.net<mailto:ausnog@lists.ausnog.net>
Subject: Re: [AusNOG] NextDC Melbourne - Scheduled Power Maintenance - 15th 
August

If you have single fed equipment in your rack that needs planning before it can 
be shut down, do you not run a totally forseeable and preventable risk then 
should that one feed trip?

This is what ATS are for.

Sam



On Thursday, 10 August 2017, Shaun McGuane 
<sh...@rackcentral.com<mailto:sh...@rackcentral.com>> wrote:
HI Simon,

Thank you for your input to the list.

While you may have provided notifications well in advance, your schedule 
provided has been changed multiple times and this creates confusion.
Without asking for further clarification last night I would never have received 
the following updated schedule from Craig Armstrong today.

Data Hall 2 – B feed (west/blue PDU side) Tuesday 15th Aug, A feed has been 
pushed back to later date around November, you will receive official notice 
once new date confirmed.
Data Hall 3 –A and B feed has been pushed back to later date around 
October/November, you will receive official notice once new date confirmed.
Data Hall 4 –A and B feed has been pushed back to later date around 
October/November, you will receive official notice once new date confirmed.

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.

Additionally, I have not received these updates via the normal NextDC E-Mail 
communication method, so I am sure other customers will be wondering whats 
happening too.

Happy to have a conversation offline about this feel free to give me a call on 
my mobile.

Regards
Shaun



From: AusNOG 
[mailto:ausnog-boun...@lists.ausnog.net<javascript:_e(%7B%7D,'cvml','ausnog-boun...@lists.ausnog.net');>]
 On Behalf Of Simon Cooper
Sent: Thursday, 10 August 2017 8:39 AM
To: 
ausnog@lists.ausnog.net<javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','nat...@nightsys.net');>
Sent: Thu, 10 Aug 2017 05:39:02 +1000
To: sh...@rackcentral.com<javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','ausnog-boun...@lists.ausnog.net');>]
 On Behalf Of Murat Sener
Sent: Wednesday, 9 August 2017 3:20 PM
To: Matthew VK3EVL 
<hit...@itglowz.com<javascript:_e(%7B%7D,'cvml','hit...@itglowz.com');>>; 
ausnog@lists.ausnog.net<javascript:_e(%7B%7D,'cvml','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.







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Murat Sener     Datacentre Manager


PREMIER Technology Solutions
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From: AusNOG 
[mailto:ausnog-boun...@lists.ausnog.net<javascript:_e(%7B%7D,'cvml','ausnog-boun...@lists.ausnog.net');>]
 On Behalf Of Matthew VK3EVL
Sent: Wednesday, 9 August 2017 3:13 PM
To: 
ausnog@lists.ausnog.net<javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','rend...@rendrag.net');>]
Sent: Wednesday, 9 August 2017 2:39 PM
To: 
<ausnog@lists.ausnog.net><javascript:_e(%7B%7D,'cvml','ausnog@lists.ausnog.net');>
 
<ausnog@lists.ausnog.net><javascript:_e(%7B%7D,'cvml','ausnog@lists.ausnog.net');>;
 Shaun McGuane 
<sh...@rackcentral.com><javascript:_e(%7B%7D,'cvml','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<javascript:_e(%7B%7D,'cvml','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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