Re: [Xen-API] tap-ctl commands

[George Shuklin <george.shuklin@xxxxxxxxx>]

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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