16-2 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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To use SnapMirror for replicating a volume, use the volsnapmirror command set and
two configuration files: /etc/snapmirror.conf and /etc/snapmirror.allow. The command
set is described in Replicating a Volume. The configuration files are described in
The /etc/snapmirror.allow File and The /etc/snapmirror.conf File.

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To use SnapMirror, you create an off-line volume to be used as the destination for data
replication. The destination volume is referred to as the mirror. The mirror can
reside on the same filer as the source volume or on another filer.
Backup: You need to reserve all pro-
cessing and networking resources
on a filer for serving NFS and CIFS
requests.
After replicating data on the source
filer, you can back up the data in the
mirror to tape. This means the source
filer does not have to allocate
resources for performing backups.
Data migration: You want to
migrate data from one filer to
another without interrupting net-
work service.
After replicating the source filer, you
can export or share the source filer
with read-only permissions so that net-
work clients cannot make additional
changes to the source filer. Because
the source and destination filers con-
tain identical data, you can change the
status of each mirror on the destination
filer to a regular volume. For more
information about how to convert a
mirror to a regular volume, refer to
Setting Volume Options in
Chapter 3.
Disaster recovery: You want to pro-
vide immediate access to data after
some disaster has caused a volume
or a filer to be unavailable.
You can change the status of the mirror
to a regular volume. Users can immedi-
ately have access to the same data as
that on the source volume. The
snapmirrored volume option con-
trols whether a volume is a mirror or a
regular volume. For more information
about volume options, refer to Setting
Volume Options in Chapter 3.

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