+ Post New Thread
Results 1 to 12 of 12
General Chat Thread, How do you set-up your UPS`s on servers with redundant PSUs????? in General; All our 8 servers now have redundant power supplies. We have 3 x large rack mount UPS`s in-case of a ...
  1. #1

    Join Date
    Aug 2007
    Posts
    848
    Thank Post
    106
    Thanked 66 Times in 47 Posts
    Rep Power
    27

    How do you set-up your UPS`s on servers with redundant PSUs?????

    All our 8 servers now have redundant power supplies. We have 3 x large rack mount UPS`s in-case of a power outage.
    Im a little confused to the best set-up, should BOTH PSU on the one server go to the same UPS or maybe a different UPS?
    This will make it difficult setting a shut down during a powercut as levels drop because different UPSs will have different loads and thus drain quicker/slower than the other 2?

    What is the suggested setup with dual PSU and APS units please?
    Thanks in advance

  2. #2

    Steve21's Avatar
    Join Date
    Feb 2011
    Location
    Swindon
    Posts
    2,762
    Thank Post
    354
    Thanked 533 Times in 498 Posts
    Rep Power
    182
    I don't know the official way, but surely having it plugged into the same UPS is just another point of failure? One UPS goes down, and you lose the server.

    Steve

  3. #3

    synaesthesia's Avatar
    Join Date
    Jan 2009
    Location
    Northamptonshire
    Posts
    6,365
    Thank Post
    612
    Thanked 1,133 Times in 867 Posts
    Blog Entries
    15
    Rep Power
    497
    Easy one - one direct into mains, one direct into UPS. UPS fails, you're still running (although UPS are supposed to then act as a direct passthrough but it's best not to take the risk). Power fails, UPS kicks in.

  4. #4
    Heebeejeebee's Avatar
    Join Date
    Nov 2006
    Location
    Intergalactic Cruise
    Posts
    1,062
    Thank Post
    69
    Thanked 80 Times in 63 Posts
    Rep Power
    36
    Al ours are one in the mains and one in the UPS.

    HBJB

  5. #5

    Join Date
    Jul 2006
    Location
    London
    Posts
    2,963
    Thank Post
    160
    Thanked 153 Times in 117 Posts
    Rep Power
    49
    I plug one into one UPS and the other into another UPS (only have one of them performing a shutdown though)

  6. #6
    DrCheese's Avatar
    Join Date
    Apr 2008
    Posts
    1,038
    Thank Post
    97
    Thanked 161 Times in 110 Posts
    Rep Power
    60
    We have one in one UPS and one in another.

    Make sure tho that your UPS's can take the load if one fails. i.e if one UPS dies the servers will draw more juice from the other remaining UPS. If you don't test in advance that your UPS can handle that, it may overload it and kill it anyway, defeating the point :P

  7. #7

    Join Date
    Aug 2007
    Posts
    848
    Thank Post
    106
    Thanked 66 Times in 47 Posts
    Rep Power
    27
    Looks like we need some more mains sockets put in the server room then!
    Thanks for this.

    How would you go about allocating the 3x UPS? i take it you cant daisy chain them?
    Just share out the servers between them?

  8. #8


    Join Date
    Dec 2005
    Location
    In the server room, with the lead pipe.
    Posts
    4,704
    Thank Post
    284
    Thanked 787 Times in 614 Posts
    Rep Power
    226
    Quote Originally Posted by burgemaster View Post
    Looks like we need some more mains sockets put in the server room then!
    Thanks for this.

    How would you go about allocating the 3x UPS? i take it you cant daisy chain them?
    Don't daisy-chain them.
    Just share out the servers between them?
    Balance the power draw across the UPS' so they're as even as you can make it. Bias load towards the newer UPS' if you can't make it quite even.

  9. #9

    AngryTechnician's Avatar
    Join Date
    Oct 2008
    Posts
    3,730
    Thank Post
    698
    Thanked 1,212 Times in 761 Posts
    Rep Power
    395
    I have each power supply plugged into a different UPS. I used to have one in the mains and one in the a UPS, but then you are bypassing the mains surge protection that the UPS provides.

    All of ours in the server room have Network Management Cards installed, and APC provides software for these which means each server can monitor both UPS feeds individually and make shutdown decisions accordingly, e.g. only shut down if both batteries are low, rather than if it's just one of them.

    Load testing is certainly important, but in practice is quite difficult to do as people get upset if you test in school time and it goes wrong! Fortunately (or unfortunately) we had a half-day site-wide power outage last year which gave me an impromptu live test without anyone getting upset if it failed (since all the client workstations were off anyway).
    Last edited by AngryTechnician; 12th January 2012 at 11:16 AM.

  10. #10

    Join Date
    Aug 2007
    Posts
    848
    Thank Post
    106
    Thanked 66 Times in 47 Posts
    Rep Power
    27
    Thanks,

    We have 3 x "APC Smart-UPS 3000RMi 2U", each has a management card but only one has the card with the environmental sensors. Ive not seen a way to monitor other UPSs? are yours made by APC?
    After an air-con failure i wanted all servers to shutdown on high temp, but was told that I needed these upgraded cards in each of the UPSs.. I will have a play with a script to launch that could shutdown them all...

  11. #11

    AngryTechnician's Avatar
    Join Date
    Oct 2008
    Posts
    3,730
    Thank Post
    698
    Thanked 1,212 Times in 761 Posts
    Rep Power
    395
    Ours are APC. The software we use on the servers is PowerChute Network Shutdown 3, and when you configure it (on the server, not on the NMC web interface) you get a screen like this:

    How do you set-up your UPS`s on servers with redundant PSUs?????-pcns.png
    (click to zoom)

    When you pick an option that uses more than 1 UPS, you get multiple boxes on the next screen to fill in with IP addresses of each NMC.

    The problem if you wanted everything to shut down based on the temp sensor is that you would have to set every server up to monitor that UPS. While this is perfectly possible, it would mean they would also receive and act on low power events from that UPS even if they weren't plugged into it.
    Last edited by AngryTechnician; 12th January 2012 at 01:01 PM.

  12. Thanks to AngryTechnician from:

    burgemaster (13th January 2012)

  13. #12

    Join Date
    Aug 2007
    Posts
    848
    Thank Post
    106
    Thanked 66 Times in 47 Posts
    Rep Power
    27
    We are using "PowerChute Network Shutdown 2.2.4"

    Looks completely different! thanks I will look into that now



SHARE:
+ Post New Thread

Similar Threads

  1. How do "you" set up your windows 7 machines?
    By machin05 in forum Windows 7
    Replies: 53
    Last Post: 13th July 2012, 05:09 PM
  2. How do you...set up printing from a mobile trolley?
    By HodgeHi in forum How do you do....it?
    Replies: 2
    Last Post: 12th October 2009, 11:31 AM
  3. Replies: 1
    Last Post: 23rd September 2008, 02:42 PM
  4. How the ferk do you set up MS Exchange server!
    By NetDiag in forum How do you do....it?
    Replies: 14
    Last Post: 14th May 2008, 08:59 AM
  5. How do you back up SiMS?
    By Kyle in forum MIS Systems
    Replies: 6
    Last Post: 23rd January 2008, 10:35 AM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •