Data Replication Using SnapMirror16-1

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The SnapMirror feature replicates data from one volume (the source) to another vol-
ume (the mirror) and periodically updates the mirror to reflect incremental changes on
the source. The result of this process is an on-line, read-only volume that contains the
same data as the source volume at the time of the most recent update. SnapMirror
requires a license code.

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You want to replicate a volume if you are in any of the situations described in When
to Copy Volumes. Because SnapMirror offers additional advantages, there are other
situations where you want to replicate a volume, as described in Table 16-1.
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Remote access to data: Users who
need read access to a volume are
distributed over a large geographical
area.
You can replicate the source volume on
other filers that are geographically
closer to the users. Users accessing a
local filer can read the data faster than
they could if they connected to a dis-
tant filer.
Load balancing: A large number of
users need only read access to a
volume.
Replicating a volume on multiple filers
enables you to distribute the load.