Exchange emails in DR Site

Exchange emails in DR Site

We have Exchange servers in siteA, the Databases are in the Storage in SiteA, but there is Storage duplication in SiteB (DR Site)

Now, if SiteA goes down, then what do we need to have already installed in SiteB for user to be able to stay on their emails seamlessly.

Thank you.
jskfanAsked:
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MaheshArchitectCommented:
this duplication is done at storage level?
and

Due you have DAG already in place ?

can you explain DAG architecture if already have?
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jskfanAuthor Commented:
this duplication is done at storage level?
Yes

We have DAG , with Databases (Active and Passive) in Site A.
The duplication of Databases are at the storage level only. So if SiteA goes down, do we need to have Exchange server already installed in SiteB ? if so how does it sync with Exchange server that is in SiteA ?

Thank you
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MaheshArchitectCommented:
yes, you have to have exchange servers installed at DR site and also your site A DAG need to be extended to include DR site servers so that they will have passive copies of active databases in site A
U also need to specify witness server at DR (alternate witness server)
Now in case site A goes down, you need to forcefully import quorum in site B and site B exchange servers passive copy should be activated
The storage level replication won't help here as far as I know
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jskfanAuthor Commented:
Are Passive Databases supposed to be in the DR site, and the Witness server in a separate site apart from SiteA and SiteB.?
If I understand the Witness server is not mandatory, it is role is just to make failover automatic if Exchange Mailbox server in SiteA is down, it will switch to Exchange server Mailbox in Site B, even with that we'll still have to make the Passive databases in Site B , manually, as Active .. Correct ?
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MaheshArchitectCommented:
Yes, passive databases would remain in DR, Though you put witness server in 3rd location, still you need manual intervention when switching datacenter, data center switchover is nothing but activating DR, there are caveats having witness in 3rd data center, its not mandatory to put witness server in 3rd data center, you can have witness server in primary DC and alternate witness in DR DC and then you can manually activate DR
You need witness server, you cannot skip witness server. Its mandatory
When you form DAG, you need witness server and during data center switchover as well
If witness server alone gone down, your DAG will remain active as long as any DAG member goes down, if DAG member also goes down, DAG will stop functioning and your DBs start dismounting
Read below articles
https://blogs.technet.microsoft.com/exchange/2011/05/31/exchange-2010-high-availability-misconceptions-addressed/
https://technet.microsoft.com/en-us/library/dd298067(v=exchg.160).aspx
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jskfanAuthor Commented:
Thank you
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