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    SubjectRe: Integration of SCST in the mainstream Linux kernel
    Bart Van Assche wrote:
    > As you probably know there is a trend in enterprise computing towards
    > networked storage. This is illustrated by the emergence during the
    > past few years of standards like SRP (SCSI RDMA Protocol), iSCSI
    > (Internet SCSI) and iSER (iSCSI Extensions for RDMA). Two different
    > pieces of software are necessary to make networked storage possible:
    > initiator software and target software. As far as I know there exist
    > three different SCSI target implementations for Linux:
    > - The iSCSI Enterprise Target Daemon (IETD,
    > http://iscsitarget.sourceforge.net/);
    > - The Linux SCSI Target Framework (STGT, http://stgt.berlios.de/);
    > - The Generic SCSI Target Middle Level for Linux project (SCST,
    > http://scst.sourceforge.net/).
    > Since I was wondering which SCSI target software would be best suited
    > for an InfiniBand network, I started evaluating the STGT and SCST SCSI
    > target implementations. Apparently the performance difference between
    > STGT and SCST is small on 100 Mbit/s and 1 Gbit/s Ethernet networks,
    > but the SCST target software outperforms the STGT software on an
    > InfiniBand network. See also the following thread for the details:
    > http://sourceforge.net/mailarchive/forum.php?thread_name=e2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com&forum_name=scst-devel.
    >
    > About the design of the SCST software: while one of the goals of the
    > STGT project was to keep the in-kernel code minimal, the SCST project
    > implements the whole SCSI target in kernel space. SCST is implemented
    > as a set of new kernel modules, only minimal changes to the existing
    > kernel are necessary before the SCST kernel modules can be used. This
    > is the same approach that will be followed in the very near future in
    > the OpenSolaris kernel (see also
    > http://opensolaris.org/os/project/comstar/). More information about
    > the design of SCST can be found here:
    > http://scst.sourceforge.net/doc/scst_pg.html.
    >
    > My impression is that both the STGT and SCST projects are well
    > designed, well maintained and have a considerable user base. According
    > to the SCST maintainer (Vladislav Bolkhovitin), SCST is superior to
    > STGT with respect to features, performance, maturity, stability, and
    > number of existing target drivers. Unfortunately the SCST kernel code
    > lives outside the kernel tree, which makes SCST harder to use than
    > STGT.
    >
    > As an SCST user, I would like to see the SCST kernel code integrated
    > in the mainstream kernel because of its excellent performance on an
    > InfiniBand network. Since the SCST project comprises about 14 KLOC,
    > reviewing the SCST code will take considerable time. Who will do this
    > reviewing work ? And with regard to the comments made by the
    > reviewers: Vladislav, do you have the time to carry out the
    > modifications requested by the reviewers ? I expect a.o. that
    > reviewers will ask to move SCST's configuration pseudofiles from
    > procfs to sysfs.

    Sure, I do, although I personally don't see much sense in such move.

    > Bart Van Assche.
    > -
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