HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)

For Windows, flush all cache files and shut down the operating system. Sma ll files held in Windows
cache can disrupt remote replication. Reboot the host as Windows requires; HP Continuous Access
EVA is n eutral to rebooting the host.
2. If you cannot access the m anagement server that is m anag ing the arrays, establish management
control with another m anagement server. For instructions, see HP Command View EVA user guide.
3. Fail over the destination DR groups.
In the replication manag er, select the destination DR group and then select Ac tions > Failover.See
online help for additional information.
4. To control the merging of data at the destination (previous source), suspend replication on the less
important DR groups. This forces the controllers to replicate the most important data first when the
links to the previous source are re-established. For more information, see Throttling merge I/O
after logging.
5. Issue operating system com m ands to resume host I/O to the n ew source. See Resuming I/O after
failover.
After a failover, you h ave three options if the cause of the failover is resolved:
• Remain failed over on the remote array.
• Return operations to the lo cal array (see Fail back to the original source (Revert to H om e)).
• Return operations to a replacement array at the local site (see Return operations to new hardware).
Recover
from failsafe-locked after destination loss
Possible scenario: You have experienced an unplanned loss of the remote array, or a loss of the
connection to the remote array, due to failure of the interswitch links, loss of power at the remote site,
loss of b
othremoteswitches,andsoon. Thedurationoftheoutageisunknown. TheDRgroupsare
failsaf
e-locked and host I/O is paused.
Action summary: Change from failsafe-enabled to normal mode, and resume host I/O until the
connection to the remote array is re-established. When the connection to the remote site is stable, change
back to the failsafe-enabled mode. Figure 9 diagrams the steps to resume operations if you cannot access
the destination while in a failsafe-locked state.
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Failover and recovery