General protocol support

Currently, there is no direct support for any client other than QEMU, but there are some means to export Sheepdog volumes using more general protocols.

iSCSI

1. Setup a patched version of QEMU to support Sheepdog data preallocation

$ git clone git://sheepdog.git.sourceforge.net/gitroot/sheepdog/qemu -b iscsi
$ cd qemu
$ ./configure
$ make
# make install

1. Create a image with data preallocation.

$ qemu-img create sheepdog:image -o preallocation=data 1G

1. Install iSCSI target daemon (tgt) with Sheepdog support

$ git clone git://github.com/fujita/tgt.git -b sheepdog
$ cd tgt
$ make
# make install

1. Setup tgt

# tgtd
# tgtadm --op new --mode target --tid 1 --lld iscsi -T iqn.2001-04.com.example:storage.sr.rose.sys1.xyz
# tgtadm --op new --mode logicalunit --tid 1 --lun 1 -b image --bstype sheepdog

See also http://www.mail-archive.com/sheepdog@lists.wpkg.org/msg00679.html

NBD

1. Create a Sheepdog image

$ qemu-img create sheepdog:image 4G

1. Start qemu-nbd on the one of Sheepdog servers

$ qemu-nbd sheepdog:image