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    SubjectRe: iSCSI support for Linux
    Ben/Nitin:

    I was going through some of the emails you guys had sent out on the LKML
    about iscsi support. I think there is some confusion about the projects.

    There are three different projects that I am aware of and are currently
    active.

    1. Cisco
    2. Intel
    3. UNH - Chris Loveland and myself were both from UNH and have since
    graduated. However, there is still active development work.

    As far as the UNH project goes:

    We have been working on both the Initiator (host) and the Target
    (Server) side. The Initiator side should work directly with the SCSI
    Initiator mid-level. As I am given to understand, the code was revved up
    to version 6.

    On the Target side, the project is a little more elaborate. Since there
    is no existing SCSI Target support, we have developed a SCSI Target
    Mid-level. This has three front-ends written for it which support:

    1. Adaptec's SCSI Encapsulation Protocol (defunct last November - since
    iSCSI has become the dominant SAN over TCP/IP protocol)
    2. QLogic ISP 2200 A Fibre Channel driver
    3. iSCSI driver (and this works on the TCP/IP software stack which Linux
    has) - so it is pretty much limited by whatever ethernet cards Linux
    supports (including GigE). We did not have access to TCP accelerated
    cards so the development on those has not been done.

    Thus you have three target drivers written for the SCSI Target mid-level
    which we has been written. For the iSCSI driver itself - there are four
    target drivers one for rev 0, rev 03, rev 06 and rev 08.

    The UNH drivers are available for download from:

    http://www.iol.unh.edu/consortiums/fc/fc_linux.html
    http://www.iol.unh.edu/consortiums/iscsi

    They have been GPLed. Lots of people are currently trying out the code
    and letting me and the other developers know about the bugs. Ideally, we
    would like to fix those (however, the rev version of the draft keeps on
    changing :-(). The Initiator code is fairly straightforward. For how to
    use the target code, my thesis is available with the tar ball from one
    of these sites.

    Okay .. to your question about authentication Ben .. the consideration
    we had to make was that a lot of the authentication stuff was to be done
    in hardware by most companies developing iSCSI (I know very little about
    authentication and security stuff so I may be completely wrong). From a
    software development perspective it would have taken a decent amount of
    time and the objective was to get code out so that it could be used for
    protocol testing in an iSCSI plugfest.

    Hope this clears some of the confusion. If you have any questions,
    please let me know. Sorry for the long email.

    Thanks
    Ashish A. Palekar

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