Each linked storage group can access the same snapshot, or each can access a
different snapshot version in either no copy or copy mode. Changes to the linked
volumes do not affect the snapshot data. To roll back a test development environment
to the original snapshot image, perform a relink operation.
Figure 15 SnapVX targetless snapshots
Target volumes must be unmounted before issuing the relink command to ensure that
the host operating system does not cache any filesystem data. If accessing through
VPLEX, ensure that you follow the procedure outlined in the technical note
EMC
VPLEX: LEVERAGING ARRAY BASED AND NATIVE COPY TECHNOLOGIES
, available on
support.emc.com
Once the relink is complete, volumes can be remounted.
Snapshot data is unchanged by the linked targets, so the snapshots can also be used
to restore production data.
Cascading snapshots
Presenting sensitive data to test or development environments often requires that
sensitive data be obfuscated before it is presented to any test or development hosts.
Use cascaded snapshots to support obfuscation, as shown in the following image.
Native local replication with TimeFinder
Cascading snapshots 97
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