(Apologies in advance, this is somewhat off-topic from ceph-devel...)
>
> First off, you need a working blktap setup for your distribution.
> So for example, you should be able to use
> "tap2:tapdisk:aio:/path/to/image.raw" as a vbd.
So, this works perfectly fine *before* replacing my /usr/sbin/tapdisk2 binary with the one built from the git repo.
>
> Starting for there you need to :
>
> - Download and compile the rbd branch of git://github.com/smunaut/blktap.git
> You will need the ceph development files/packages for this ( for
> debian librados-dev librbd-dev )
>
> $ git clone git://github.com/smunaut/blktap.git
> $ cd blktap
> $ git checkout -b rbd origin/rbd
> $ ./autogen.sh
> $ ./configure
> $ make
This goes just fine, no issues here.
>
> - Replace the installed tapdisk binary with the new one
>
> $ sudo cp ./drivers/.libs/tapdisk /usr/bin/tapdisk
My distro (openSuSE 12.1) has /usr/sbin/tapdisk for original tapdisk v1, and /usr/sbin/tapdisk2 for version 2 stuff. I'm replacing /usr/sbin/tapdisk2.
>
> - Add 'rbd' as supported format in 'xm'
> For some reason 'xm' checks the image format itself before handing
> off to the tap-ctl ...
>
> Edit /usr/lib/xen-4.1/lib/python/xen/xend/server/BlktapController.py
> and add 'rbd' in the blktap2_disk_types list at the top.
> (location of file will vary depending on xen version and distribution)
Fixed this.
>
> - Setup a proper /etc/ceph/ceph.conf containing at least the mon addresses
> Also make sure you have a /etc/ceph/keyring with the user key if
> you use cephx
>
> Once that's done, you should be able to attach disk to a running VM using :
>
> $ xm block-attach test_vm tap2:tapdisk:rbd:rbd/test xvda2 w
>
After replacing the /usr/sbin/tapdisk2 binary with the newly-built one from the git repo, I'm unable to attach RBD *or* RAW images to a VM. Here's the error I get upon attempting to start the VM:
Error: ('create', '-aaio:/tmp/small.img') failed (1280 )
This is attempting to just use "tap2:aio" for the image format ("tap2:tapdisk:aio" fails identically, as does "tap2:rbd:rbd/test"). In my /var/log/messages file, I see the following:
Apr 23 10:34:51 se004922 kernel: [ 6328.409708] blktap_control_allocate_tap: allocated tap ffff8807a4898800
Apr 23 10:34:51 se004922 tapdisk[32464]: tapdisk-control: init, 10 x 4k buffers
Apr 23 10:34:51 se004922 tapdisk[32464]: I/O queue driver: lio
Apr 23 10:34:51 se004922 tapdisk[32464]: tapdisk-log: started, level 0
Apr 23 10:34:51 se004922 tapdisk[32464]: nbd: Set up local unix domain socket on path '/var/run/blktap-control/nbdclient32464'
Apr 23 10:34:53 se004922 tapdisk[32464]: ERROR: errno -5 at tapdisk_control_read_message: failure reading message at offset 280/536
Apr 23 10:34:53 se004922 tap-ctl: tap-err:tap_ctl_read_message: failure reading message
Apr 23 10:34:53 se004922 tap-ctl: tap-err:tap_ctl_send_and_receive: failed to receive 'unknown' message
That "nbd" portion is particularly puzzling - why would it try to start nbd when I've specified a simple tap2:aio image?
-Nick
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