42 Preparing Your Systems for Clustering
c
Click
Next
if you want to enter the login information for another
controller or click
Apply
to commit the log in information.
19
In the
Connect to Additional Arrays
screen, select if you want to connect
to another storage array. To connect to another storage array, repeat the
steps above starting from step d. If you do not want to connect to
additional arrays, click
Finish
on the final screen to exit the utility.
Understanding CHAP Authentication
Before proceeding to either "Configuring CHAP Authentication on the
Storage Array (Optional)" on page 43 or "Configuring CHAP Authentication
on the Host Server (Optional)" on page 45, it would be useful to gain an
overview of how CHAP authentication works.
What is CHAP?
Challenge Handshake Authentication Protocol (CHAP) is an optional iSCSI
authentication method where the storage array (target) authenticates iSCSI
initiators on the host server. Two types of CHAP are supported: target CHAP
and mutual CHAP.
Target CHAP
In target CHAP, the storage array authenticates all requests for access issued
by the iSCSI initiator(s) on the host server through a CHAP secret. To set up
target CHAP authentication, you enter a CHAP secret on the storage array,
then configure each iSCSI initiator on the host server to send that secret each
time it attempts to access the storage array.
Mutual CHAP
In addition to setting up target CHAP, you can set up mutual CHAP in which
both the storage array and the iSCSI initiator authenticate each other. To set
up mutual CHAP, configure the iSCSI initiator with a CHAP secret that the
storage array must send to the host server in order to establish a connection.
In this two-way authentication process, both the host server and the storage
array send information that the other must validate before a connection is
allowed.
CHAP is an optional feature and is not required to use iSCSI. However, if you
do not configure CHAP authentication, any host server connected to the same
IP network as the storage array can read from and write to the storage array.
book.book Page 42 Monday, June 21, 2010 1:45 PM
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