Mailing List Archive: Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86

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

Oct 16, 2011, 5:35 AM

Post #1 of 5 (187 views)

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

Re: Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86_64.rpm [ In reply to ]

pasik at iki

Oct 16, 2011, 1:17 PM

Post #2 of 5 (187 views)

Permalink

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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Re: Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86_64.rpm [ In reply to ]

m.a.young at durham

Oct 25, 2011, 4:40 PM

Post #3 of 5 (177 views)

Permalink

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.

Michael Young

Re: Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86_64.rpm [ In reply to ]

m.a.young at durham

Oct 26, 2011, 3:03 PM

Post #4 of 5 (178 views)

Permalink

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.

Michael Young

Re: Missing blktap(2) driver in kernel-2.6.32-*.el6.xendom0.x86_64.rpm [ In reply to ]

pasik at iki

Oct 26, 2011, 4:11 PM

Post #5 of 5 (179 views)

Permalink

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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