HP 3PAR Cluster Extension Software Administrator Guide (5697-1429, March 2012)

Change of HP 3PAR storage system IP or password file
If there is change in the configured HP 3PAR storage system's IP address in the Cluster Extension
configuration or if the configured password file is missing or corrupt, Cluster Extension will fail to
communicate with the storage system and cannot perform any Cluster Extension failover operations.
You can use the Connection Test option of HP 3PAR Cluster Extension configuration tool to verify
connectivity of configured storage systems. To change HP 3PAR storage systems settings, use the
Modify option in the HP 3PAR Cluster Extension configuration tool and save the configuration file
on all cluster nodes.
MNS needs its own resource monitor
The MNS quorum is a regular cluster resource that is monitored by the cluster resource monitor
(ResrcMon.exe). To avoid cluster failures because of other hanging resources, HP recommends
that the MNS resource run in its own resource monitor process. This can be changed by selecting
the MNS quorum resource in the Cluster Administrator GUI. Right-click and select Properties from
the menu or double-click the MNS resource and select the box next to Run this resource in a separate
Resource Monitor, and then click OK.
Host persona settings
Host personas are a set of behaviors that permit hosts connected to FC or iSCSI ports on the HP
3PAR storage system to deviate from the default host behavior. By assigning a persona to a host,
multiple host types that require distinct customized responses can share a HP 3PAR storage system
port. For example, hosts running Windows, Linux, and AIX operating systems can all connect to
the same HP 3PAR storage system port.
You can set the host persona number when the host is created or modify it later. To display, create,
modify, and remove host personas, use the HP 3PAR CLI commands or the HP 3PAR Management
Console. For instructions on displaying, creating, modifying, and removing host personas, see the
HP 3PAR InForm CLI Administrator’s Manual or the HP 3PAR InForm Management Console Online
Help.
NOTE: Host persona setting varies based on the Windows operating system installed on the
cluster nodes, For more information, see the HP 3PAR Implementation Guide.
no_fail_wrt_on_err settings
The no_fail_wrt_on_err policy apply only to synchronous Remote Copy.
The no_fail_wrt_on_err group policy (default policy) allows writes to a primary Remote Copy
volume group even though the link between the systems in the Remote Copy pair is broken.
Continuing to write changes despite a broken link leads to a loss of synchronization between
primary and secondary Remote Copy volume groups. The no_fail_wrt_on_err policy is used
when you would rather keep the applications that are writing the data running, even when the
Remote Copy has failed and become out of sync. After the error that caused the broken link is
resolved, you must manually restart the Remote Copy operation between the members of the Remote
Copy pair to bring the Remote Copy in sync again.
NOTE: HP 3PAR Cluster Extension supports only the Remote Copy volume groups with
no_fail_wrt_on_err policy. For information on setting the Remote Copy volume group policies,
see the “Remote Copy Commands” section in HP 3PAR Remote Copy User’s Guide .
Remote Copy and 3PAR Virtual Domains
Remote Copy checks HP 3PAR Virtual Domains (domains) on the remote system to ensure that the
virtual volume is mirrored to the same domain name as the local domain name. The domain needs
to be called a correct domain name. For more information on domains, see the HP 3PAR Concepts
Guide and for instructions on setting up domains, see the HP 3PAR CLI Administrator’s Manual.
Change of HP 3PAR storage system IP or password file 81