WSUS Location
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@eleceng said in WSUS Location:
@scottalanmiller SAM there are 2 DC's now (VM's) and i have to add DNS and DHCP as separate VM's or put them together.
It's a very small network but needs high availability.
Should DNS and DHCP have a primary and secondary VM?
They should be redundant, just like AD. In a cluster.
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@dafyre said in WSUS Location:
@dashrender said in WSUS Location:
@scottalanmiller said in WSUS Location:
@dafyre said in WSUS Location:
Splitting to split failure domains is terrible thinking. That doubles the chances of AN outage, and they don't solve anything.
Why is it terrible thinking? If I have two failure domains, half keeps working and the other half is down. Yes, there's an outage, but we're not completely dead in the water.
That's not at all correct. If DHCP fails and your IP fails, then AD fails TOO. If AD fails and DHCP does not, you still have a partial outage.
Your system makes ANY failure twice as likely. Half of the time it is just as bad as having them combined. The other half of the time isn't AS bad, but not good.
So it's that easy. Your dead in the water time is equal either way, because you have a complete DHCP dependency apparently. The other half of the time, even though you are not completely dead, is 100% unnecessary risk caused solely by having designed the system to fail unnecessarily often (by 50%.)
By merging the services you can dramatically reduce your overall risk with literally zero downsides.
I'm really trying to understand the math here considering - two AD servers, two DHCP servers - and crazily, we'll assume one DNS server, because he never stated that he has two DNS servers.
In this scenario, 2 x AD+DNS Servers, and 2 x DHCP Servers (Windows, Configured for HA)
Right, that's a lot of extra risk (and cost) for no reason. You could have more reliability going down to just two VMs instead of four.
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@dashrender said in WSUS Location:
If AD itself goes tits up, but the box stays running - DHCP will stay running
Correct, only risk is at the hardware or operating system level.
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@dashrender said in WSUS Location:
@dafyre said in WSUS Location:
@dashrender said in WSUS Location:
@dafyre said in WSUS Location:
Umm... if DHCP is running on the AD server that went tits up, then yes it does. Especially if everything is completely AD integrated.
If AD itself goes tits up, but the box stays running - DHCP will stay running
NB: My current AD servers are not tied in to AD
What? how are AD servers not tied to AD - unless you're talking about the physical hosts (i.e. the Hypervisor level)
Argh... The typos. I'll fix it It should be :
NB: My current DHCP servers are not tied in to AD
And what do you gain from that?
Risk and cost!
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@dashrender said in WSUS Location:
@scottalanmiller said in WSUS Location:
@dafyre said in WSUS Location:
Splitting to split failure domains is terrible thinking. That doubles the chances of AN outage, and they don't solve anything.
Why is it terrible thinking? If I have two failure domains, half keeps working and the other half is down. Yes, there's an outage, but we're not completely dead in the water.
That's not at all correct. If DHCP fails and your IP fails, then AD fails TOO. If AD fails and DHCP does not, you still have a partial outage.
Your system makes ANY failure twice as likely. Half of the time it is just as bad as having them combined. The other half of the time isn't AS bad, but not good.
So it's that easy. Your dead in the water time is equal either way, because you have a complete DHCP dependency apparently. The other half of the time, even though you are not completely dead, is 100% unnecessary risk caused solely by having designed the system to fail unnecessarily often (by 50%.)
By merging the services you can dramatically reduce your overall risk with literally zero downsides.
I'm really trying to understand the math here considering - two AD servers, two DHCP servers - and crazily, we'll assume one DNS server, because he never stated that he has two DNS servers.
Assuming the DNS is either with the AD or with the DHCP. As DNS is an AD dependency, you have to keep them together for safety. However DHCP is also an AD dependency that you have to keep together for safety. So who knows.
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@scottalanmiller SAM thanks for the video that does clarify it and makes it easy to understand.
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@eleceng said in WSUS Location:
@scottalanmiller SAM thanks for the video that does clarify it and makes it easy to understand.
No problem
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@scottalanmiller said in WSUS Location:
@dashrender said in WSUS Location:
@scottalanmiller said in WSUS Location:
@dafyre said in WSUS Location:
Splitting to split failure domains is terrible thinking. That doubles the chances of AN outage, and they don't solve anything.
Why is it terrible thinking? If I have two failure domains, half keeps working and the other half is down. Yes, there's an outage, but we're not completely dead in the water.
That's not at all correct. If DHCP fails and your IP fails, then AD fails TOO. If AD fails and DHCP does not, you still have a partial outage.
Your system makes ANY failure twice as likely. Half of the time it is just as bad as having them combined. The other half of the time isn't AS bad, but not good.
So it's that easy. Your dead in the water time is equal either way, because you have a complete DHCP dependency apparently. The other half of the time, even though you are not completely dead, is 100% unnecessary risk caused solely by having designed the system to fail unnecessarily often (by 50%.)
By merging the services you can dramatically reduce your overall risk with literally zero downsides.
I'm really trying to understand the math here considering - two AD servers, two DHCP servers - and crazily, we'll assume one DNS server, because he never stated that he has two DNS servers.
Assuming the DNS is either with the AD or with the DHCP. As DNS is an AD dependency, you have to keep them together for safety. However DHCP is also an AD dependency that you have to keep together for safety. So who knows.
Scott Allan Miller - excellent video and thanks for you awesome input as always. I made it about 5 minutes before I got lost in your beard though xD
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@dave247 a common enough problem.
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@scottalanmiller said in WSUS Location:
@dave247 a common enough problem.
As is open mouth video images.
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@jaredbusch But it makes him look so.... Happy! lol.
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@dafyre said in WSUS Location:
@jaredbusch But it makes him look so.... Happy! lol.
He does look Jolly, doesn't he?
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@dashrender said in WSUS Location:
@dafyre said in WSUS Location:
@jaredbusch But it makes him look so.... Happy! lol.
He does look Jolly, doesn't he?
I AM jolly!
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@scottalanmiller said in WSUS Location:
@dashrender said in WSUS Location:
@dafyre said in WSUS Location:
@jaredbusch But it makes him look so.... Happy! lol.
He does look Jolly, doesn't he?
I AM jolly!
yeah - frankly I'm envious...
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Why WSUS and not Windows Update for Business? It's so much better.
