214
Installing and
Using
Synchronous
Mirroring with a
Wide Area
Network
When installing and using the Synchronous Mirroring premium feature over a wide
area network (WAN), keep these guidelines in mind:
If you are setting up an FCIP router to perform Synchronous Mirroring, go to the
Compatibility Matrix. Select Router-FCIP in the Product field, and select the
release of the storage management software that you use in the Software Release
field. Verify that the maximum latency and distance are supported by referring to
the vendor specifications for your router and by checking the NetApp
Interoperability Matrix Tool (IMT) site at http://now.netapp.com.
FCIP router vendors and telecommunication vendors are responsible for setting
up routing.
The smaller the bandwidth on the WAN, the longer it takes an asynchronous
mirror to synchronize.
If the bandwidth does not exceed the average rate, you might not be able to
synchronize the data at all. For example, if the system writes at 1 Mb/s, it needs 2
Mb/s of bandwidth available.
If the mirroring is lagging far behind during production hours, suspend the
mirror. During off-peak hours, resume the mirror.
If you need to keep the Synchronous Mirroring on at all times, keep the mirror
physically as close as possible to the production site.
To determine the average write rate, you should use the available system utilities
and should take measurements during peak times.
If you anticipate adding any applications, determine the bandwidth needs for any
future applications.
Acceptable lag times vary depending on the environment and should be
determined on an individual basis.
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