Hi all,
My environment : 3 Exchange 2013 CU23 servers (both CAS + Mailbox roles) in 1 DAG , Windows server 2008 R2 : ex01 , ex02 , ex03 .
ex01 and ex02 are same hardware configuration.
ex03 hardware is more powerful then ex01 and ex02
I'm going to purchase a new server (ex04) with same hardware as server ex03 and I attempt to restructure my Exchange environment : 2 Exchange 2013 CU23 servers (both CAS + Mailbox roles) in 1 DAG , Windows server 2012 R2 : ex03 , ex04
I do some search:
- Exchange 2013 support OS to Window Server 2012 R2
- We cannot perform a in-place upgrade of operation system from Windows server 2008 R2 to Windows server 2012 R2 on a server running Exchange 2013
So here my plan :
Install Windows server 2012 R2 and Exchange server 2013 CU23 on new server ex04
Join ex04 into DAG --> DAG has 4 members : ex01 , ex02 , ex03 (Windows server 2008 R2) and ex04 (Windows server 2012 R2)
Let ex04 holds all mailbox databases (mount/active copies) , remain ex servers hold passive copies
Remove all mailbox databases copies from ex01 , ex02 , ex03
Remove ex01 , ex02 , ex03 from DAG , decommission them
Install Windows server 2012 R2 and Exchange 2013 CU23 on ex03 , join it to DAG again, add mailbox databases copies to ex03 ...
But I concern about step 2 : I remember that I read somewhere Exchange 2013 DAG must be running the same operating system ?
Please give me some advice , thank you very much.