I've copy that to http://wiki.xensource.com/wiki/Blktap, hope you don't
against CC-BY-SA for this.
On 25.05.2012 20:34, Jonathan Ludlam wrote:
First, allocate a minor number in the kernel:
# tap-ctl allocate
/dev/xen/blktap-2/tapdev4
This is the path which will be the block device later.
Then, spawn a tapdisk process:
# tap-ctl spawn
tapdisk spawned with pid 28453
Now, you need to attach the two together:
# tap-ctl attach -m 4 -p 28453
Finally, you can open a VHD:
# tap-ctl open -m 4 -p 28453 -a vhd:/path/to/vhd
Or perhaps you'd like to open a raw file?
# tap-ctl open -m 4 -p 28453 -a aio:/path/to/raw/file
Or maybe an NBD server?
# tap-ctl open -m 4 -p 28453 -a nbd:127.0.0.1:8000
(For this last one to work you'll need a blktap from github/xen-org/blktap
trunk-ring3 branch)
You can also open a secondary to start mirroring things to:
# tap-ctl open -m 4 -p 28453 -a vhd:/path/to/vhd -2 vhd:/path/to/mirror/vhd
Afterwards, you'll need to tear things down. Close the tapdisk image:
# tap-ctl close -m 4 -p 28453
Detach the tapdisk process from the kernel - this also kills the tapdisk process
# tap-ctl detach -m 4 -p 28453
Now free the kernel minor number:
# tap-ctl free -m 4
Also useful is stats querying:
# tap-ctl stats -m 4 -p 28453
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