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aptitude -y install open-iscsi

Configuration

Optionally backup the configuration file that will be changed: /etc/iscsi/iscsid.conf.

...

user=someone
password=secret
sed -i "s/^node.session.auth.authmethod = None$/node.session.auth.authmethod = CHAP\nnode.session.auth.username = $user\nnode.session.auth.password = $password/" default

Testing

/etc/init.d/open-iscsi restart

...

If fscking is required ... TODO 

Issue investigation

How to identify a /dev/sd[a-z]+ as an iSCSI device

The easiest way is to list /dev/disk/by-path/

...