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Recovery Considerations
The Sun StorEdge Network Data Replicator 3.0 System Administrator's Guide contains
information about various recovery scenarios. This section describes the following
topics:
Failing Over to the Secondary Site
Recovering the Primary or Secondary Site
Using The Sun SNDR and Sun StorEdge Instant Image Software
Failing Over to the Secondary Site
Should the primary site fail, the secondary copy can be used to continue operations
after the user community and the applications are switched to the alternate site. You
should implement application level recovery procedures at the secondary site to help
ensure application recovery to a well-known state.
Recovering the Primary or Secondary Site
Occasionally, remote mirroring operations are interrupted either intentionally or by
unplanned outages. Normally, these interruptions are handled by the Sun SNDR
software because whenever a member of a Sun SNDR software volume pair becomes
unavailable, the write activity is scoreboarded in the volume's bitmap. When the
service is restored, a fast update or resynchronization is performed.
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Sun StorEdge Network Data Replicator 3.0 Configuration Guide • June 2001
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