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Home » Microsoft » Windows Server » Active Directory » ADMT - Migration Strategy Question
ADMT - Migration Strategy Question [message #161735] Tue, 06 October 2009 20:55 Go to next message
John  is currently offline John
Messages: 1125
Registered: July 2009
Senior Member
We're about to migrate user and computer objects (~4000 of each) from 3 old
trusted forests/domains into a domain (all Win2003). To avoid overloading of
tasks on a given weekend, we'd like to split up the migration tasks by
migrating computer objects 2 weeks before the migration of user objects and
mailboxes. When we migrate computers objects, we're also planning to change
our IP address scheme for all clients. We're thinking that the migration of
PC objects would be transparent to the users - is that true?

Can someone comment on the pros/cons of doing the migration in the manner
specified above, versus doing everything over one weekend (a pretty
overwhelming set of tasks)? Thanks!
Re: ADMT - Migration Strategy Question [message #161737 is a reply to message #161735] Tue, 06 October 2009 21:28 Go to previous messageGo to next message
Dave[2]  is currently offline Dave[2]
Messages: 10
Registered: September 2009
Junior Member
General recommendation is to migrate users & groups first, followed by
computers and servers. You should note that users migration operation is
completely transparent to the end user, however a computer migration changes
the domain membership of the computer. The computer migration importantly
also updates the permissions of the files/folders (profiles etc) on the
users computers and servers, so you need to migrate users first such that
the file/folder permissions are updated (where olddomain\olduder is updated
to newdomain\newuser).

So suggest migrate Users & Groups >> Workstations >> Server


"John" <John@discussions.microsoft.com> wrote in message
news:E1918834-8D58-432B-A154-1CB80ED4B429@microsoft.com...

We're about to migrate user and computer objects (~4000 of each) from 3 old
trusted forests/domains into a domain (all Win2003). To avoid overloading of
tasks on a given weekend, we'd like to split up the migration tasks by
migrating computer objects 2 weeks before the migration of user objects and
mailboxes. When we migrate computers objects, we're also planning to change
our IP address scheme for all clients. We're thinking that the migration of
PC objects would be transparent to the users - is that true? Can someone
comment on the pros/cons of doing the migration in the manner specified
above, versus doing everything over one weekend (a pretty overwhelming set
of tasks)? Thanks!
RE: ADMT - Migration Strategy Question [message #161764 is a reply to message #161735] Wed, 07 October 2009 07:13 Go to previous message
Joe Dunn  is currently offline Joe Dunn
Messages: 36
Registered: July 2009
Member
Trying to migrate 4000 users and computers in one weekend is a huge
undertaking if not impossible. Even if you managed to get these all migrated
the risk to the business of making such a huge change in a short time space
would be far to high for me. We have always approached migrations by
creating batchs of users and their respective computers and migrate one batch
each night. The most we ever did was 50 with 5 support staff available
during the migration and in the morning.

There are always issues regardless of what any documentation says.
Computers are not turned on, go into standby, incorrect DNS entries, netlogon
or workstation service not started, firewall blocks the ADMT agent. This is
before the users even logon in the morning - if they can logon!

If you migrate the computers first and the users continue to use their old
accounts they will get new profiles when they logon with their migrated
account. You can use the security migration wizard to translate the profiles
but this adds another step. As I mentioned before the best approach in my
experience is to migrate users and their computers at the same time. Groups
should be migrated in advance.

To give you some perspective the last migration I worked on took 6 months
for 1500 users and 80 servers.

Best Regards
Joe Dunn
MBCS, MCSE, MCTS, CCNA






"John" wrote:

>
> We're about to migrate user and computer objects (~4000 of each) from 3 old
> trusted forests/domains into a domain (all Win2003). To avoid overloading of
> tasks on a given weekend, we'd like to split up the migration tasks by
> migrating computer objects 2 weeks before the migration of user objects and
> mailboxes. When we migrate computers objects, we're also planning to change
> our IP address scheme for all clients. We're thinking that the migration of
> PC objects would be transparent to the users - is that true?
>
> Can someone comment on the pros/cons of doing the migration in the manner
> specified above, versus doing everything over one weekend (a pretty
> overwhelming set of tasks)? Thanks!
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