You can modify parameters on both the iSCSI initiator and the iSCSI target device. However, the only parameters that can be modified on the iSCSI initiator are the following:
iSCSI initiator node name – You can change the initiator node name to a different name. If you change the initiator node name, the targets that were discovered by iSNS might be removed from the initiator's target list, depending on the discovery domain configuration on the iSNS server at the time when the name was changed. For more information, see How to Modify iSCSI Initiator and Target Parameters.
Header digest – NONE, the default value or CRC32.
Data digest – NONE, the default value or CRC32.
Authentication and CHAP secret key – For more information about setting up authentication, see How to Configure CHAP Authentication for Your iSCSI Initiator.
Configured sessions – For more information about configuring multiple sessions, see How to Enable Multiple iSCSI Sessions for a Target.
The iSCSI driver provides default values for the iSCSI initiator and iSCSI target device parameters. If you modify the parameters of the iSCSI initiator, the modified parameters are inherited by the iSCSI target device, unless the iSCSI target device already has different values.
Caution - Ensure that the target software supports the parameter to be modified. Otherwise, you might be unable to log in to the iSCSI target device. See your array documentation for a list of supported parameters.
You can modify the iSCSI parameters only after I/O between the initiator and the target is complete. The iSCSI driver reconnects the session after the changes are made by using the iscsiadm modify command.