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

143 of 739
Note:
● If you are running Windows Server 2000 on the primary DNS server
hosting zones or domains that contain source and/or target resource
records, you must have the DNS WMI Provider installed on that DNS
server.
● The Dynamic updates setting for the DNS zone should be set to Secure
only. Otherwise, you must disable dynamic registration on the source
server in order to prevent the source from reclaiming its DNS record.
● If a hosts file entry for the source server exists on the client machine,
errors may occur during a failover and failback.
● Reverse lookup in DNS should be enabled. For more information about
enabling reverse lookup, refer to your Microsoft documentation.
● DNS registration for the private (devoted to Storage Mirroring Recover)
NIC IP should be disabled.
● If your Exchange server is using a public IP address to receive email, you
will have to change the public advertised DNS MX record to reflect the
target IP. Consult your service provider for instructions.
● To allow external email to be delivered to the target server when the
source is unavailable, you should create an additional external MX record
for the target server. The target MX record should have a lower priority
than the source. Refer to your router or firewall documentation for more
information.
● In a clustered server in an environment with more than one NIC, if the
heartbeat network IP is at the top of the binding order, a socket error
occurs when you attempt to select or configure the server. This error can
be avoided by changing the binding order on all the source and target
servers/nodes involved so that the domain IP address should be at the top
of the order. Then, reboot the servers involved.
● For more information about using the DNS Failover utility, access the
dfo.exe help by typing dfo.exe /? from a command prompt.
In order to set the primary DNS server with which the Application Manager will
communicate during failover, you must launch Application Manager using the command
line /exchange /advanced option (dtam /exchange /advanced). When launched in the
Advanced context, the Client DNS Server field will appear on the Configure DNS
Failover window. Use the Client DNS Server field to select the primary DNS server.
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