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DR Series Best Practice Guide
14
Reducing Bandwidth Concerns
A successful replication configuration interacts with its environment positively. In situations where
replication traffic is negatively impacting other services, fine tuning becomes necessary to limit the
impact. The following suggestions will help make sure replication is not placing a burden on other
services.
1. Make certain to schedule the replication process outside the hours where it could impact
business. If video conferencing or other business critical applications are experiencing the
effect of a low-bandwidth situation, verify the replication schedule and make sure it happens
during non-business hours. Also, make sure to account for the backup window when the daily
backups are being stored to the DR appliance.
2. In situations where the bandwidth of the impacted services is well known, the bandwidth
available to the replication process can be reduced. Throttling the replication bandwidth
requires more time for the replication process to complete, but leaves room for the impacted
services to do their thing. For example, if video conferencing requires 1MB/s on a 10MB/s link,
scale back the available replication bandwidth to 9MB/s, providing bandwidth for everyone to
play nice together.
Domain Access
In addition to data, NFS and CIFS security information is also replicated between DR appliances. This
allows access to each DR appliance joined to the same domain / forest from user or group accounts
with appropriate permissions. Access to a given DR appliance will be denied when not joined to the
same domain/forest. Make certain that all DR appliances are joined to the same domain, which
provides access to all devices without concern for entering different permissions for each appliance.
Note: CIFS and NFS protocol access is not synced between source and target DRs. It is not
known what is at the remote site so these settings are not transferred. Before failing over, make
sure the target DR is setup with the appropriate protocol access as required.