Figure 36 Planned failover: after personality swap
Applications running
Production host
Remote host
Site B
Site A
SRDF links
R2
R1
When the maintenance, upgrades or testing procedures are complete, you can repeat
the same procedure to return production to Site A.
Unplanned failover
An unplanned failover moves production applications from the primary site to the
secondary site after an unanticipated outage at the primary site, and the primary site
is not available.
Failover to the secondary site in a simple configuration can be performed in minutes.
You can resume production processing as soon as the applications are restarted on the
failover host connected to Site B.
Unlike the planned failover operation, an unplanned failover resumes production at the
secondary site, but without remote mirroring until Site A becomes operational and
ready for a failback operation.
The following image shows failover to the secondary site after the primary site fails.
Figure 37
Failover to Site B, Site A and production host unavailable.
R2
R1
R1
Production host
Remote, failover host
Site BSite A
SRDF links
Production host
Remote, failover host
Site BSite A
SRDF links -
suspended
Site failed Site failed
R2
Not Ready or
Read Only
Read/Write
Remote replication solutions
138 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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