What is RID master?
What is the RID Master role? The RID Master is one of the
operations master roles that exist in each domain in a forest. It
controls the sequence number for the domain controllers within a
domain. It provides a unique sequence of RIDs to each domain
controller in a domain. When a domain controller creates a new
object, the object is assigned a unique security ID consisting of a
combination of a domain SID and a RID. The domain SID is a constant
ID, whereas the RID is assigned to each object by the domain
controller. The domain controller receives the RIDs from the RID
Master. When the domain controller has used all the RIDs provided
by the RID Master, it requests the RID Master to issue more RIDs
for creating additional objects in the domain. When a domain
controller exhausts its pool of RIDs, and the RID Master is
unavailable, any new object in the domain cannot be created