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Designing Windows Sync
Existing Directory Server entries that are modified to contain the necessary
NT attributes will not be synchronized until the next total update.
Modifications to Windows entries and Directory Server entries that have
already been synched are carried at the next incremental update. As a part of
this strategy, try to master data in a single place, limiting the applications that
can change the data, and schedule necessary total updates (these updates will
not overwrite or delete existing information; they will add new entries and
send modifications).
Resource Requirements
Synchronization uses server resources. Consider the following resource
requirements when defining your replication strategy:
•
Disk usage — The changelog is written after each update operation. Servers
receiving many update operations may see higher disk usage. In addition, a
single changelog is maintained for all replication databases and synchronized
databases. If a supplier contains multiple replicated and synched databases,
the changelog will be used more frequently, and the disk usage will be even
higher.
•
Server threads — The sync agreement uses one server thread.
•
File descriptors — The number of file descriptors available to the server is
reduced by the changelog (one file descriptor) and each replication and sync
agreement (one file descriptor per agreement).
•
Quality of the LANs and WANs connecting different buildings or remote
sites and the amount of available bandwidth.
•
The number and size of the entries stored in the directory.
A site that manages human resource databases or financial information is
likely to put a heavier load on your directory than a site containing
engineering staff that uses the directory for simple telephone book purposes.
Services to Install
While User Sync is installed with the Directory Server and enabled by default,
there are two other Windows services that need to installed on the Windows
machine to synchronize passwords and NT4 Server entries.
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Red Hat Directory Server Deployment Guide • May 2005
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