+ Post New Thread
Results 1 to 12 of 12
Thin Client and Virtual Machines Thread, Can I virtualise my only DC? in Technical; Hi all I have Primary schools with just one physical DC. The server normally runs AD, DHCP, DNS, print server. ...
  1. #1
    XiJ
    XiJ is offline

    Join Date
    Mar 2013
    Location
    Sheffield
    Posts
    223
    Thank Post
    12
    Thanked 44 Times in 41 Posts
    Rep Power
    11

    Can I virtualise my only DC?

    Hi all

    I have Primary schools with just one physical DC. The server normally runs AD, DHCP, DNS, print server. Sometimes they also run WSUS and even occasionally a SIMS server too.

    I would like to start virtualising - with new hardware. I'm concerend that many of my schools will be on a budget and not sure if they'd benefit from virtual servers. My questions would be

    1. Is it worth Virtualising my only DC?
    2. Is it recommended?
    3. Can I use some large capacity internal drives for storage between all VM's?

    The older server could stay as a secondary DC if necessary but isn't good enough to run VM's on really.

    I did look at this thread: Whether to virtualise our main servers but not sure it all applies to my primary schools.

    Cheers

  2. #2

    FN-GM's Avatar
    Join Date
    Jun 2007
    Location
    UK
    Posts
    16,252
    Thank Post
    898
    Thanked 1,785 Times in 1,537 Posts
    Blog Entries
    12
    Rep Power
    463
    What OS is the DC? Virtual DC's are supported by MS for 2012 and 2012 R2.

  3. Thanks to FN-GM from:

    XiJ (28th January 2014)

  4. #3
    XiJ
    XiJ is offline

    Join Date
    Mar 2013
    Location
    Sheffield
    Posts
    223
    Thank Post
    12
    Thanked 44 Times in 41 Posts
    Rep Power
    11
    okay, thanks. we would use 2012 / 2012 R2 with a new license.

  5. #4

    FN-GM's Avatar
    Join Date
    Jun 2007
    Location
    UK
    Posts
    16,252
    Thank Post
    898
    Thanked 1,785 Times in 1,537 Posts
    Blog Entries
    12
    Rep Power
    463
    It is supported, even snapping shotting is.

    If you run it on Hyper-V make sure you don't join the host machine to the domain.

  6. Thanks to FN-GM from:

    XiJ (28th January 2014)

  7. #5
    XiJ
    XiJ is offline

    Join Date
    Mar 2013
    Location
    Sheffield
    Posts
    223
    Thank Post
    12
    Thanked 44 Times in 41 Posts
    Rep Power
    11
    Thanks - yes read about that. We wouldn't join host to domain but i would probably use hyper-v

  8. #6

    Join Date
    Jan 2009
    Location
    Northants
    Posts
    146
    Thank Post
    5
    Thanked 11 Times in 10 Posts
    Rep Power
    13
    If you virtualised you would have the benefit of being able to run 2 DC's, DHCP , DNS etc, that would allow some resiliency for doing updates/patches etc, but you will be putting lots of eggs in a single piece of hardware basket (no different to only having a single server to start with)

  9. Thanks to SkreeM1980 from:

    XiJ (28th January 2014)

  10. #7

    Join Date
    Sep 2010
    Posts
    617
    Thank Post
    26
    Thanked 71 Times in 66 Posts
    Rep Power
    21
    you might notice issues with time syncing and MS recommend syncing with an external source (to the host) for this.

  11. Thanks to SHimmer45 from:

    XiJ (28th January 2014)

  12. #8

    Domino's Avatar
    Join Date
    Oct 2006
    Location
    Bromley
    Posts
    4,136
    Thank Post
    217
    Thanked 1,337 Times in 818 Posts
    Blog Entries
    4
    Rep Power
    521
    For peace of mind I'd still keep the physical DC with the virtual as a second.


    I know it's supported, and I know it *should* be fine...but there's no harm in having a physical beasty after all the issues others have had with virt DCs

  13. Thanks to Domino from:

    XiJ (28th January 2014)

  14. #9


    Join Date
    May 2009
    Posts
    3,298
    Thank Post
    291
    Thanked 887 Times in 665 Posts
    Rep Power
    341
    Quote Originally Posted by XiJ View Post
    Hi all

    I have Primary schools with just one physical DC. The server normally runs AD, DHCP, DNS, print server. Sometimes they also run WSUS and even occasionally a SIMS server too.

    I would like to start virtualising - with new hardware. I'm concerend that many of my schools will be on a budget and not sure if they'd benefit from virtual servers. My questions would be

    1. Is it worth Virtualising my only DC?
    2. Is it recommended?
    Depends. I might consider it in a really really small environment where there are no services not dependent on the VM hosted services anyway. It does tend to be frowned on because authentication tends to be used by many other services, some of which might be independent of the hosted services (some building access control, login to MFD's etc).
    3. Can I use some large capacity internal drives for storage between all VM's?
    You can technically, but assuming a 1Gbs or better network, IO is probably the first bottleneck a virtual environment will run into. A little capacity planning could go a long way.

  15. Thanks to pcstru from:

    XiJ (28th January 2014)

  16. #10
    AButters's Avatar
    Join Date
    Feb 2012
    Location
    Wales
    Posts
    501
    Thank Post
    158
    Thanked 112 Times in 86 Posts
    Rep Power
    44
    Been running all vitual DCs here for years (on VMware) - just don't touch the snapshot button!

  17. Thanks to AButters from:

    XiJ (29th January 2014)

  18. #11

    Join Date
    Oct 2009
    Location
    Lincoln
    Posts
    14
    Thank Post
    0
    Thanked 4 Times in 4 Posts
    Rep Power
    11
    ok first off please please don't put all your DCs on the same box, if the host fails than no one can log in and the domain is down, always either have a physical DC as well or and far better have 2 Hosts with a DC on each

  19. #12

    Join Date
    Oct 2009
    Location
    Lincoln
    Posts
    14
    Thank Post
    0
    Thanked 4 Times in 4 Posts
    Rep Power
    11
    if your host is part of the domain, some times it has to be, then please follow this advice on preventing a nightmare with system time.

    We were having timing issues due to the PDC being a Virtual. Hosts look at the PDC for time, but Virtuals take time from the host, so time issues can just spiral. The scenario is, the PDC is a minute out, host looks at PCD changes time to PDC, later, PDC looks at Host and is a minute out so changes time to Host and so on.

    Solution

    Configure your PDC as per How to configure an authoritative time server in Windows Server using the “fix it myself”, configuring a PDC to use an external Time Source.

    Then make sure you go to the Virtual PDC in Hyper V manager, go to setting, and then to integration services, untick time synchronisation.

    This works well now.

    Time servers I used when configuring are “1.uk.pool.ntp.uk.0x1 2.uk.pool.ntp.org.0x1” (Don’t forgot to put the ,0x1 or it won’t work).



SHARE:
+ Post New Thread

Similar Threads

  1. How can I upgrade my site to the newest package?
    By dhasmet in forum EduGeek Joomla 1.5 Package
    Replies: 1
    Last Post: 10th July 2009, 02:47 PM
  2. [CLOSED] Bug/Error: can't edit my own posts...
    By JohnMason in forum EduGeek.net Site Problems
    Replies: 1
    Last Post: 5th September 2008, 12:25 PM
  3. Replies: 4
    Last Post: 25th January 2007, 12:39 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
  •