When and why is a Full Directory Resynchronization needed, and how long will it approximately take?
Excerpt from the QMM Tips and Tricks document:
Full Directory Resynchronization
Normally, no resynchronizations are required after the initial synchronization is complete. The ongoing synchronization process brings only changes made since the last agent’s session to the opposite directory. Changes are identified by changed Update Sequence Numbers (USNs).
However, in certain cases you might consider full resynchronization for a job. These are described in further detail below.
- Group membership for the groups may not be updated correctly if you have migrated groups before user accounts are migrated to the target domain (see the Linked Attributes and Group Migration topic). Running full resynchronization after all objects are migrated will help resolve all the links.
- If you have modified a directory synchronization job configuration after the job has already been started, full re-synchronization is required. You will be prompted by Migration Manager to restart the Directory Synchronization Agent processing the job. The initial synchronization (full source and target directories enumeration and synchronization) will take place.
Note that full directory resynchronization is a time-consuming operation. During the operation, the source and target directories are fully re-enumerated, and then the objects within the specified synchronization scope are matched and synchronized. The process may take up to 10 hours for 100,000 objects, depending on your hardware. You should plan for full re-synchronization and avoid it until it is actually required.
Note: Many other factors can affect the speed of resynchronization. Indexing matching attributes and specifying a preferred DC and GC, as outlined in the documentation, might significantly increase the speed of Full Resynchronization. In some situations using thoroughly tested LDAP filters might speed up the Full Resynchronization (also called Initial Synchronization).
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