How do I know my AD replication is healthy?
Replication errors creep in silently; they only surface when logins or GPOs misbehave.
Try this first
- 1Run a replication report regularly
- 2DNS health is a prerequisite for AD
- 3Check time sync between DCs
- 4Review event logs on both DCs
When to bring us in
Long replication outage: avoid the tombstone limit or the DC cannot safely rejoin.
See also
- One DC or two DCs for an SMB office?Two is almost always the right answer; one DC is a single point of failure for logon, DNS and GPOs.
- Should I split FSMO roles across two DCs?For a small domain all on one DC is fine; with two DCs splitting is tidier but not required.
- Logins are slow at the second office.Subnets are often missing in Sites and Services so clients hit a DC over the WAN.
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