Dell Emulex Family of Adapters - Manual (Page 1572)

Boot Version 10.2 for NIC, iSCSI, FCoE, and RoCE Protocols User Manual P010097-01B Rev. A
5. Configuring x86/x64 Platforms for the iSCSI Protocol
Managing an iSCSI Session
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Managing an iSCSI Session
To transmit information from an iSCSI initiator to an iSCSI target, the initiator must
first establish a session with the target through an iSCSI login process. The login
process:

Starts a TCP/IP connection.

Verifies that the iSCSI initiator has access to the iSCSI target (authentication).

Allows negotiation of various parameters.
Logging into an iSCSI Session
An iSCSI session has two phases:

Login Phase – iSCSI parameters are negotiated using login requests and
responses.

Full Featured Phase – Once security/authentication has occurred and
operational parameters have been set, the initiator begins to perform SCSI I/Os.
Security
Because the iSCSI protocol operates in the Internet environment, security is critical. The
iSCSI SAN uses the CHAP security method.
CHAP Authentication
CHAP is used to periodically verify the identity of the initiator by the target using a
challenge/response mechanism. The challenge/response is established on the initial
link and may repeated at any time afterward. For CHAP to work, the target must know
the initiator's secret key, and the initiator must correctly respond to the challenge.
Although the authentication is only one-way, you can negotiate CHAP in both
directions for mutual authentication, with the help of the same secret set.
Configuring for the iSCSI Protocol
This section provides instructions for configuring boot from SAN for iSCSI on various
operating systems using the iSCSISelect utility. It also provides information on how to
use the iSCSISelect utility to perform an MPIO boot configuration.
Setting Up Boot from SAN for iSCSI
In iSCSI target configuration, you have the option of setting dual network paths to a
single boot LUN. You must follow these steps in this order to configure boot support
successfully for each operating system.
1. Use the iSCSISelect utility to configure a boot target.
Note: iSCSI must be enabled for the port before configuring a boot target.
2. Complete the normal operating system installation.