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Windows Server 2012 Thread, Anyone upgraded from 2012 to 2012 R2 yet? in Technical; Originally Posted by Michael I'm struggling to see what the difference is between this and DHCP with Conflict Detection enabled? ...
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    DrPerceptron's Avatar
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    Quote Originally Posted by Michael View Post
    I'm struggling to see what the difference is between this and DHCP with Conflict Detection enabled? If one DHCP Server isn't available, the other online server gives it an IP. I've had this setup for years since Server 2003.
    It's generally not in Microsoft's Best Practices info for DHCP for starters. Picking the Failover config in 2012/2012 R2, they replicate the data between each other, so if one does go down, the other knows everything that the down host knew about - which leases are active, reservations etc and can work with the full scope - no requirement for splitting 80/20 etc, so rather than ping and wait for responses to dish out an address, it can just give an address immediately(ish)

    There's no real difference in their ultimate end purpose, just the way both solutions go about it, the Failover options are more... elegant?
    Last edited by DrPerceptron; 25th October 2013 at 04:44 PM.

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    FN-GM's Avatar
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    Quote Originally Posted by Michael View Post
    I'm struggling to see what the difference is between this and DHCP with Conflict Detection enabled? If one DHCP Server isn't available, the other online server gives it an IP. I've had this setup for years since Server 2003.
    You cant do reservations with that

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    Michael's Avatar
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    Quote Originally Posted by DrPerceptron View Post
    It's generally not in Microsoft's Best Practices info for DHCP for starters. Picking the Failover config in 2012/2012 R2, they replicate the data between each other, so if one does go down, the other knows everything that the down host knew about - which leases are active, reservations etc and can work with the full scope - no requirement for splitting 80/20 etc, so rather than ping and wait for responses to dish out an address, it can just give an address immediately(ish)

    There's no real difference in their ultimate end purpose, just the way both solutions go about it, the Failover options are more... elegant?
    You can dish out the full scope or split the scope 50/50, 80/20, however you like. I agree though that the only difference is the scopes don't replicate between each other. Not a major problem, but that's what the conflict part resolves.

    As for reservations FN-GM - I usually have a set of IPs I reserve from being distributed - ideal for switches, printers, admin workstations etc...

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    DrPerceptron's Avatar
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    Quote Originally Posted by DrPerceptron View Post
    Looking at doing it this week or next.

    [...]

    Is anyone using DHCP Failover and upgraded without breaking the relationship?
    So that I can't become the newer, modern DenverCoder9

    I did a straight upgrade on both boxes and everything about them is quite happy. The failover relationship continues to work even when one has been upped to R2 and the other isn't. Not that I wasn't expecting it to behave itself, but you never know.

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    rob998's Avatar
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    I did in place upgrades on both DCs last week. Upgraded from 2008 R2 to 2012 R2. Couldn't have been easier! AD and DOMAIN Prep then run the upgrade. Everything was back up and running in about 30 mins. Backed up the data server VMs using Veeam and updated them from 2008 R2 to 2012 R2 from home. So easy.

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    Currently updating 2x DCs from 2008 and 2x DCs from 2008r2

    Had to go to 2008 to 2012 on the 2008 ones first, as it wouldn't let them go direct to 2012r2 for some reason.

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    Alis_Klar's Avatar
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    I always thought it was better to do a fresh install where possible asp with critical systems such as DC's. I am deciding for my new SIMS server what OS to go for 2008 R2 or 2012/R2? If I can do an easy inplace upgrade later I will go for 2008 R2 as 2012 R2 is not supported by Capita yet.

    All advice gratefully received

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    Quote Originally Posted by Alis_Klar View Post
    I always thought it was better to do a fresh install where possible asp with critical systems such as DC's. I am deciding for my new SIMS server what OS to go for 2008 R2 or 2012/R2? If I can do an easy inplace upgrade later I will go for 2008 R2 as 2012 R2 is not supported by Capita yet.

    All advice gratefully received
    It generally is, but we found the inplace upgrade worked well. Make sure you have a back up though just incase.

    We done the upgrade, and ran disc clean up and it just worked. But these are for servers running microsoft products. not sure about 3rd party ones.

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    We have 3 Hyper-V servers, DirectAccess, A RemoteApp server, a DPM server and 2 DCs with 2012R2. We are currently (as in right at the moment) configuring Web Application Proxy to see how that goes. We upgraded the DCs but fresh installs for the rest.

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    currently installing 4 2012 R2 physical servers, these will host the 2012 R2 Dcs and one 2008 r2 for sims

    only issue so far is file copying and network speed if logged on the server, works fine if copying from win 7 to the server

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    Quote Originally Posted by Jose View Post
    currently installing 4 2012 R2 physical servers, these will host the 2012 R2 Dcs and one 2008 r2 for sims

    only issue so far is file copying and network speed if logged on the server, works fine if copying from win 7 to the server
    Why no virtualisation? Seems like a bit of a waste of hardware to use a whole box just for a DC.

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    Quote Originally Posted by mrbios View Post
    Why no virtualisation? Seems like a bit of a waste of hardware to use a whole box just for a DC.
    they are , may be i did not give enough info

    4 physical servers, these are hyperv hosts
    the 2 DCs virtual, one 2008 for sims virtual
    either a smooth wall or lightspeed machine

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    I have upgraded 4 server so far to 2012 R2 with no real issues apart from an MDT server where I had to reinstall MDT to a newer version.

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    I have done about 8 now. Only problem was our WDS server, it worked, but the drivers were not injecting into the image once it had deployed them, so had to roll back to 2008r2 in the short term.

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    Sadly we're stuck with a certain AV product that has no support for 2012 R2 as yet!

    I guess their founder saying they're a terrible product must have been true! lol

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