To test this one out, I created to domain controllers in the same domain. Both origionally have the same ADRM password. I used the following procedure to change the ADRM password on DC2:
· Logged on DC2 and the domain administrator
· Opened a command prompt.
· Type ntdsutil and press Enter.
· Type set dsrm password and press Enter.
· Type reset password on server null and press Enter.
· I entered and confirmed the password or password123
· I then types Q and pressed Enter twice.
· Close the command prompt.
My next step is to see if DC 1 was using the new or old AD dsrm password or not.
· When the server reboots, press F8 to enter the Windows Advanced Options.
· Select Directory Services Restore Mode
· Once the server boots, log in with the local administrator account, using the dsrm password.
On DC1, the original password worked.
On DC2, the password worked.
SO the answer to this question is yes, you can have multiple dsrm passwords. They are simply the local administrator password for the domain controllers in Directory Services Restore Mode.