need your help!

Hi all,

here is our one DAG setup in one forest with three AD sites:  (Exchange 2010 SP1) and each site has domain controllers too

Site     MBX server      CAS/hub server     witness share                 DAGIP                  Databases hold

Site1:  MBX1 & MBX2;  CAS array (cas1 &cas2) ; \\cas\dag01   198.168.0.10          MBX1: DB1, DB2 ; MBX2; DB3, DB4

Site2:  MBX3;                CAS3 ;             \\cas2\dag01 (alternate)172.18.0.10          DB1, DB2, DB3, DB4

Site1:  MBX4;                CAS4 ;             \\cas4\dag01               10.1.10.10             DB1, DB2, DB3, DB4

databases DB1 AND DB2 mounted on MBX1; DB3 AND DB4 mounted on MBX2; Activation preference for MBX3 is 2; Avtivation preference from MBX4 is 3.

when I run get-clientaccessaray, I get:

Name                  Site                        Fqdn                                      Members

CAS array 1         Site1             cmail1.mycompany.local                 CAS1 and CAS2

CAS array 2         Site2             cmail2.mycompany.local                 CAS3

CAS array 3         Site3             cmail3.mycompany.local                 CAS4

Now, we are going to move site1's servers to site3. (no more site1)

We need to change each server's IP in site1 and what else I need to change? since CAS array in site1 will be in site3, will "CAS array1"'s site be changed automatically to site3?   Do you think whether we still keep CAS4 since cas array 1 (CAS3 and CAS4) is site3 also after move?

Thank you very much.