9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

• When configuring a management interface on a P4000 storage system, make sure that
interface is on a separate network. Configuring two separate interfaces on the same IP network
is not supported and will result in communication problems in the cluster.
• When configuring a management interface on a P4000 storage system, be aware that only
one interface can be configured with a default gateway, and that interface should be the
management interface. Configuring two default gateways will result in communication problems
in the cluster.
• When configuring a management interface on a P4000 storage system, you must designate
the storage interface as the SAN/iQ interface for that storage system in the CMC. This is done
on the Communications tab in the TCP/IP configuration category for that storage system.
Changing network configurations
Changing the network configuration of a storage system may affect connectivity with the network
and application servers. Consequently, we recommend that you configure network characteristics
on individual storage systems before creating a management group or adding them to existing
clusters.
If you do need to change the network characteristics of a storage system while it is in a cluster, be
sure to follow HP's recommendations. See “Best practices when changing network characteristics”
(page 49).
Best practices when changing network characteristics
• Plan to make network changes during off-peak hours to minimize the impact of those changes.
• Make changes on one storage system at a time.
• Some network changes cause the storage server to restart the SAN/iQ services, making the
storage system unavailable for a short time. Check the Availability tab for each storage system
to see if any volumes will become unavailable if the services restart on the storage system.
Volumes and snapshots may become temporarily unavailable while services restart. Examples
include unreplicated volumes, or snapshots that are causing a restripe of the data.
• After the changes are in place, verify the iSCSI sessions. You may need to update the sessions.
Getting there
1. In the navigation window, select a storage system.
2. Open the tree under the storage system, and select TCP/IP Network.
Figure 25 Viewing the TCP/IP Network category for a storage system
Changing network configurations 49