Xen devel - Oct 2011 - Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86_64.rpm

I''m not sure if this belongs here, but someone in the ##xen channel in
irc.freenode.net told me to message this list and let people know about
and/or inquire as to why the blktap (or better yet blktap2) driver is not
included in M A Young''s aforementioned kernels, blkbackend is there but
it
does not allow for tap:aio disks in the domU''s.

Thanks,
David


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On Sun, Oct 16, 2011 at 08:35:23AM -0400, David Della Vecchia
wrote:
>    I''m not sure if this belongs here, but someone in the ##xen
channel in
>    [1]irc.freenode.net told me to message this list and let people know
about
>    and/or inquire as to why the blktap (or better yet blktap2) driver is
not
>    included in M A Young''s aforementioned kernels, blkbackend is
there but it
>    does not allow for tap:aio disks in the domU''s.
>    Thanks,
Hello,

Added Michael as CC ..

-- Pasi


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On Wed, Oct 26, 2011 at 11:03:02PM +0100, M A Young
wrote:
> On Wed, 26 Oct 2011, M A Young wrote:
>
>> On Sun, 16 Oct 2011, Pasi Kärkkäinen wrote:
>>
>>> On Sun, Oct 16, 2011 at 08:35:23AM -0400, David Della Vecchia
wrote:
>>>>    I''m not sure if this belongs here, but someone in
the ##xen channel in
>>>>    [1]irc.freenode.net told me to message this list and let
people
>>>> know about
>>>>    and/or inquire as to why the blktap (or better yet blktap2) 
>>>> driver is not
>>>>    included in M A Young''s aforementioned kernels,
blkbackend is
>>>> there but it
>>>>    does not allow for tap:aio disks in the domU''s.
>>>>    Thanks,
>>
>> The answer is that it isn''t there because I haven''t
got the kernel to
>> compile with it enabled. I may have another look at it, but it may be 
>> that it requires too much needs to change to get it working.
>
> As I suspected it will be a fair amount of work to get blktap working on  
> RHEL6. It seems that Red Hat have back ported some of the block device  
> code from later kernels, and I don''t think there is a
corresponding
> blktap for those kernels yet.
>
Actually there is:
http://lists.xensource.com/archives/html/xen-users/2011-07/msg00647.html

kernel:
http://xenbits.xensource.com/gitweb/?p=people/dstodden/blktap-dkms.git;a=summary
http://xenbits.xensource.com/gitweb/?p=people/dstodden/linux.git;a=summary

userspace:
http://xenbits.xensource.com/gitweb/?p=people/dstodden/blktap.git;a=summary

Hopefully those help.. 

-- Pasi


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