how long a dc can stay without seeing the FSMO role dc's

As a part of our DRBC exercise we want to isolate a site from another which contains all the FSMO role Domain Controllers.  How long a DC can stay without seeing its FSMO role domain controllers ?
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Share-ITConnect With a Mentor Commented:
If it has no FSMO roles then no more than 60 days or it will be tombstoned and therefor effectively evicted from AD
The main roles to worry about are the RID and and PDC the rid pool is what assigns new Relative IDs to new objects in AD and they are dished out in blocks of 500. So once you've created 500 object in your AD with no RID master, you cant create any more. If your AD rarely changes  then this could ba a long time.
As for the PDCe, this role get involved for all sorts of things such as Password lockouts/resets time sync etc - not very long at all.
Without access to the FSMO roles, you won't be able to modify group membership or change passwords, create users or computer accounts etc.  
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Also in any case not more than 60 days or it gets tombstoned.
nmu-adminAuthor Commented:
I actually want to know how long a normal domain controller can be isolated from the domain controllers which has its FSMO roles ?
It depends...
Providing that the other DC has a global catalog and can resolve DNS it can remain isolated for some time. Problems will only arise if you try to change the schema, change trusts, create new domains and new objects since the relevant FSMO role holders will not be available (that said the RID master normally issues RIDs in blocks to DCs, so you can normally create a few new objects such as users, before it runs out and needs to contact the RID master again).

Obviously any chnages made will not be able ro replicate id the DC is isolated.

As has alreasy been said, the DC must not be left isolated for longer than the tombstone preiod - otherwise you are into serious issues - the actual length of the tombstone period varies according to the OS and service pack - You can change/check it - see
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