HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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● If dynamic updates are enabled on a standard primary zone, the source
server will be able to update its DNS records after failover. To prevent this,
configure DNS to use an Active Directory-integrated zone.
● For more information about using the DNS Failover utility, access the
dfo.exe help by typing dfo.exe /? from a command prompt.
Identity failover
Select this option if you want to failover by transferring the source IP address and name
to the target. When using identity failover, it is possible that a name and/or IP address
conflict can occur either during failover or when the original source server comes back
online. To avoid this conflict, use DNS Failover.
Note:
Application Manager cannot be used for failover or failback when the Identity
failover method is selected. However, the Failover Control Center can still be
used to initiate failover. DNS failover reduces downtime and provides other
benefits. It is recommended for most environments.
In Identity Failover, the target’s physical identity is modified to match the source during a
failover. This includes the target adopting the source server’s name, primary IP address,
and drive shares during a failover. Identity failover may be required in the following
situations:
● Access to the domain controller or DNS server is not available (for example, due to
permissions) from the account that Storage Mirroring Recover runs under on the
source/target servers.
● If you determine that the time it takes to propagate the necessary DNS or Active
Directory changes to the rest of your environment is not acceptable. The time
needed to propagate these changes depends on your Active Directory Replication
and DNS server settings.
● If you have client applications that are configured to connect to an IP address
rather than a server name.
After you select the Identity Failover option, click Configure. The Configure Identity
Failover window will appear.