Hi James, A quick Google tells me APC ATS are break before make, so that is certainly not the defining feature of an ATS vs. STS.
For cost effective provision of a 'C feed' in racks to catch those pesky single corded devices you just can't live without I see no reason at all to go to the expense of typically larger and more expensive STS, happy to learn more though. Sam On Thursday, 10 August 2017, James Braunegg <[email protected]> wrote: > 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* > > [image: cid:[email protected]] > > 1300 769 972 / 0488 997 207 <1300%20769%20972> > > *[email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');>* > > www.micron21.com/ > > [image: cid:[email protected]] <http://www.micron21.com/> > > [image: cid:[email protected]] > <https://www.facebook.com/micron21/> > > [image: cid:[email protected]] <https://twitter.com/micron21> > > Follow us on Twitter <https://twitter.com/micron21> for important service > and system updates. > > This message is intended for the addressee named above. It may contain > privileged or confidential information. If you are not the intended > recipient of this message you must not use, copy, distribute or disclose it > to anyone other than the addressee. If you have received this message in > error please return the message to the sender by replying to it and then > delete the message from your computer. > > > > > > *From:* AusNOG [mailto:[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>] *On > Behalf Of *Matthew Smee > *Sent:* Thursday, 10 August 2017 12:00 PM > *To:* [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > *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:[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>] *On > Behalf Of *Sam Silvester > *Sent:* Thursday, 10 August 2017 10:14 AM > *To:* Shaun McGuane <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> > *Cc:* [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');> > *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 <[email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> 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:[email protected]] *On Behalf Of *Simon > Cooper > *Sent:* Thursday, 10 August 2017 8:39 AM > *To:* [email protected] > *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:* [email protected] > *Sent:* Thu, 10 Aug 2017 05:39:02 +1000 > *To:* [email protected] > *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 <[email protected]> > 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:[email protected]] *On Behalf Of *Murat > Sener > *Sent:* Wednesday, 9 August 2017 3:20 PM > *To:* Matthew VK3EVL <[email protected]>; [email protected] > > > *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!* > SIMPLY CLICK ON A FACE TO GIVE FEEDBACK > > *GREAT* > > *AVERAGE* > > *BAD* > > <https://protect-au.mimecast.com/s/ZXg4BxUQRobS3?domain=crewhu.com> > > <https://protect-au.mimecast.com/s/m4kKB9UQ4mAS1?domain=crewhu.com> > > <https://protect-au.mimecast.com/s/krZGBXug3DJiw?domain=crewhu.com> > > > > *From:* AusNOG [mailto:[email protected]] *On Behalf Of *Matthew > VK3EVL > *Sent:* Wednesday, 9 August 2017 3:13 PM > *To:* [email protected] > *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:[email protected]] > *Sent:* Wednesday, 9 August 2017 2:39 PM > *To:* <[email protected]> <[email protected]>; Shaun McGuane > <[email protected]> > *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 <[email protected]> > 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 > [email protected] > http://lists.ausnog.net/mailman/listinfo/ausnog > <https://protect-au.mimecast.com/s/pLG0B1fQrxkS1?domain=lists.ausnog.net> > > -- > > Damien Gardner Jnr > VK2TDG. Dip EE. GradIEAust > [email protected] - http://www.rendrag.net/ > <https://protect-au.mimecast.com/s/Ld1wBKUl1AwIG?domain=rendrag.net> > -- > We rode on the winds of the rising storm, > We ran to the sounds of thunder. > We danced among the lightning bolts, > and tore the world asunder > > > > _______________________________________________ > > AusNOG mailing list > > [email protected] > > http://lists.ausnog.net/mailman/listinfo/ausnog > <https://protect-au.mimecast.com/s/pLG0B1fQrxkS1?domain=lists.ausnog.net> > > > > > MESSAGE PROTECTED BY *PREMIER TECHNOLOGY SOLUTIONS* > <https://protect-au.mimecast.com/s/GN1YBofq1r8tD?domain=premiertech.com.au> > - POWERED BY *MAILGUARD* > <https://protect-au.mimecast.com/s/YZ5qB0uDN27IX?domain=mailguard.com.au>. > > Report this message as spam > <https://protect-au.mimecast.com/s/K410BnUo1JOHd?domain=console.mailguard.com.au> > > > > > MESSAGE PROTECTED BY *PREMIER TECHNOLOGY SOLUTIONS* > <https://protect-au.mimecast.com/s/GN1YBofq1r8tD?domain=premiertech.com.au> > - POWERED BY *MAILGUARD* > <https://protect-au.mimecast.com/s/YZ5qB0uDN27IX?domain=mailguard.com.au>. > > > > > _______________________________________________ > AusNOG mailing list > [email protected] > http://lists.ausnog.net/mailman/listinfo/ausnog > <https://protect-au.mimecast.com/s/pLG0B1fQrxkS1?domain=lists.ausnog.net> > > > >
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