HP Storage Mirroring Software User Manual

Page 223

Workload protection

Page 222 of 677

address for DNS updates.

Exchange Note: If you are protecting Exchange and one or more IP addresses

are configured for the SMTP virtual server on the target, the first
IP address will be the default target IP address for all source IP
addresses.

3. You can specify the length of time, in seconds, that the source's DNS A records are

cached in the Time to Live. Enable Update TTL and specify a number of seconds.
Ideally, you should specify 300 seconds (5 minutes) or less.

Note: In order to update the Time to Live, the machine where the Application

Manager is running must be able to connect to the DNS server through
WMI. If it cannot, the Time to Live record will not be updated and the
Application Manager will return an error that the RPC server is unavailable.

4. Specify DNS Credentials and specify a user that has privileges to access and

modify DNS records. The user must be a member of the DNSAdmins gruop for the
domain where the DNS server resides. You can enter a user for a different domain
by entering a fully qualified name in the format domain\username or
username@domain. If you enter a non-qualified name, the DNS domain from the
DNS server will be used.

5. Once your DNS failover settings are configured, click Test to validate your

configuration. If you have any issues with your configuration, review the following
DNS information.

The DNS zone Dynamic updates 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.

DNS reverse lookup should be enabled For more information on enabling
reverse lookup, see your Microsoft documentation.

If you are running Windows Server 2000 on the primary DNS server and are
hosting zones or domains that contain source and/or target records, you must
have the DNS WMI Provider installed on that DNS server.

If a hosts file entry for the source server exists on end-user machines, errors
may occur during a failover and failback.