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Distributed I/O Daemon - a 9P file server
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| Building | 

To build all of diod's features, you need a few prerequisites:

    lua, lua-devel (version 5.1 or better) [on debian/ubuntu liblua5.1-dev]
	For /etc/diod.conf config file support.

    munge, munge-libs, munge-devel
	For MUNGE authentication support.

    tcp_wrappers, tcp_wrappers-libs, tcp_wrappers-devel
	For TCP wrapper support.

    libcap, libcap-devel
	Necessary for correct handling of supplemental groups when
	server is running as root (DAC check is delegated to client).

Note: on Debian/Ubuntu, LUA requires the following configure flags:

    ./configure CPPFLAGS="-I/usr/include/lua5.1" --with-lua-suffix=5.1

| Client Requirements | 

Diod is a user space server for the kernel v9fs client (9p.ko, 9pnet.ko).
Although the kernel client supports several 9P variants, diod only supports
9P2000.L, and only in its feature-complete form, as it appeared in 2.6.38.

Earlier versions of the kernel that do not support 9P2000.L will fail
at mount time when version negotiation fails.  Some pre-2.6.38 versions
of the kernel that have 9P2000.L but still send some 9P2000.u ops may
fail in less obvious ways.  Use a 2.6.38 or later kernel, or a v9fs
backport such as this one of's v9fs to RHEL6.1's 2.6.32 kernel.


| Testing |

Unit tests (make check):

	Miscellaneous unit tests.
	Some tests will be skipped if not root.
	Others will be skipped if valgrind is not installed.

	User space client and user space server running across a socketpair.
	Some tests will be skipped if not root.
	Others will be skipped if you ARE root.
	None require kernel 9p support.

        Kernel space client and user space server running across a socketpair.
        Tests will be skipped if 9p cannot be modprobed.

Running by hand for debugging:

    Start diod server in foreground, with proto debug, no-auth, one export:
	sudo ./diod -f -d 1 -n -e /tmp/9

    Mount it:
        sudo mount -t 9p -n /mnt \

    Or mount with diodmount:
	sudo ./diodmount -n localhost:/tmp/9 /mnt

    Or if diodmount is installed as /sbin/mount.diod:
        sudo mount -t diod -n localhost:/tmp/9 /mnt

Running diod for I/O forwarding on clusters:

    On I/O node, set up /etc/diod.conf accordign to diod.conf(5), then:
       chkconfig diod on
       service diod start

    On compute node, if I/O node is fritz42, add entries like this to fstab
    (assumes diodmount is installed as /sbin/mount.diod):
       fritz42:/g/g0  /g/g0         diod  default 0 0

    Alternatively, use "zero-config" automounter method(*):
       set DIOD_SERVERS="fritz42" in /etc/sysconfig/auto.diod
       add to /etc/auto.master "/d /etc/auto.diod"
       mkdir /d
       chkconfig autofs on
       service autofs start
       ln -s /d/g.g0 /g/g0

    Note that at this point diod is only being tested with NFS file systems.
    Use it with Lustre or GPFS at your own peril - but if you do, please
    report issues!

(*)only works on exports that are themselves mount points, see /etc/auto.diod

| Support |

    Source access is on the github site:

    Wiki and issue tracker are on the google code site:

    Diod can be discussed on the v9fs-users mailing list:
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