iSCSI drive doesn't mount after reboot of windows 2008 r2

Apart from Favourites list have you checked if the volumes are listed in Volumes and Devices tab in iSCSI initiator properties? And are they set to Auto Configure?

This should (in theory) make sure that all volumes are initialized.

Source

Make sure add to favorites and enable muilti-path is selected when you connect to targets:

When you discover portal, click advanced, don’t use defaults click “Microsoft iSCSI Intiator” and you’re NIC IP for Initiator IP.