Isns Server; Iscsi Load Balancing; Requirements; Compliant Iscsi Initiators - HP StorageWorks P4000 User Manual

iSNS server

An iSNS server simplifies the discovery of iSCSI targets on multiple clusters on a network. If you use
an iSNS server, configure your cluster to register the iSCSI target with the iSNS server. You can use
up to 3 iSNS servers, but none are required.

iSCSI load balancing

Use iSCSI load balancing to improve iSCSI performance and scalability by distributing iSCSI sessions
for different volumes evenly across storage systems in a cluster. iSCSI load balancing uses iSCSI
Login-Redirect. Only initiators that support Login-Redirect should be used.
When using VIP and load balancing, one iSCSI session acts as the gateway session. All I/O goes
through this iSCSI session. You can determine which iSCSI session is the gateway by selecting the
cluster, then clicking the iSCSI Sessions tab. The Gateway Connection column displays the IP address
of the storage system hosting the load balancing iSCSI session.
Configure iSCSI load balancing when setting up servers. See

Requirements

• Cluster configured with a virtual IP address. See
• A compliant iSCSI initiator.

Compliant iSCSI initiators

A compliant initiator supports iSCSI Login-Redirect AND has passed HP' test criteria for iSCSI failover
in a load balanced configuration.
Find information about which iSCSI initiators are compliant by clicking the link in the New or Edit
Server window.
The link opens to the
the HP StorageWorks P4000 SAN Solutions Compatibility Matrix.
If your initiator is not on the list, do not enable load balancing.

Authentication (CHAP)

Server access with iSCSI can use the following authentication methods:
• Initiator node name (single host)
• CHAP (Challenge-Handshake Authentication Protocol), which can support single or multiple hosts.
NOTE:
The iSCSI terminology in this discussion is based on the Microsoft iSCSI Initiator terminology. For the
terms used in other common operating systems, see
CHAP is a standard authentication protocol. The SAN/iQ software supports the following
configurations:
300 iSCSI and the HP P4000 SAN Solution
http://www.hp.com/go/P4000compatibility
Chapter 19 on page 299.
"Virtual IP addresses" on page 299.
where you log in and search for
iSCSI and CHAP terminology" on page 302.