`pvmove stuck' in RH bugzilla

`pvmove stuck' in RH bugzilla

[Sergey Senozhatsky]

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Hello,

I think we just trapped into the same trouble with pvmove as described in 

https://bugzilla.redhat.com/show_bug.cgi?id=602516
https://bugzilla.redhat.com/show_bug.cgi?id=706036
etc.

Comment says, that
> I found a series of problems with pvmove which I have fixed in the upstream
> repository.  However, I would like to wait some time to see that no unintended
> side-effects show up before seeing the change back-ported to RHEL.  An audit
> for similar bugs found a problem in lvremove, which I have also fixed. 
> lvconvert still needs to be audited.


Alasdair, could you please point are those patches in vanilla kernel 
(3.0-rc*) or linux-next, or some RH internal tree? 
This is not critical, though I'd like to try out patches.


Thanks,
	Sergey

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Re: `pvmove stuck' in RH bugzilla

[Alasdair G Kergon]

On Wed, Jul 06, 2011 at 12:53:10PM +0300, Sergey Senozhatsky wrote:
> I think we just trapped into the same trouble with pvmove as described in 
> https://bugzilla.redhat.com/show_bug.cgi?id=602516
> https://bugzilla.redhat.com/show_bug.cgi?id=706036
> 
> Alasdair, could you please point are those patches in vanilla kernel 
> (3.0-rc*) or linux-next, or some RH internal tree? 
> This is not critical, though I'd like to try out patches.
 
This is a userspace bug not a kernel one.
There is a workaround, which is to perform the pvmove one LV at a time
using the --name option.  (For each LV, run pvmove -n <lvname>.)

The patched code is in the upstream lvm2 repository:
  git://sources.redhat.com/git/lvm2
  http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/doc/?cvsroot=lvm2
  http://sourceware.org/lvm2/

It was only last night that the code incorporating these changes passed
our public testsuite for the first time, so I think it is still
premature to be using this on production systems.  But this means I hope
to be in a position to make the first development release containing a
fix for the problems quite soon.  (I added assertions to catch other
instances of the related problems - it was more than just pvmove
affected.)

Alasdair

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Re: `pvmove stuck' in RH bugzilla

[Sergey Senozhatsky]

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On (07/06/11 12:23), Alasdair G Kergon wrote:
> On Wed, Jul 06, 2011 at 12:53:10PM +0300, Sergey Senozhatsky wrote:
> > I think we just trapped into the same trouble with pvmove as described in 
> > https://bugzilla.redhat.com/show_bug.cgi?id=602516
> > https://bugzilla.redhat.com/show_bug.cgi?id=706036
> > 
> > Alasdair, could you please point are those patches in vanilla kernel 
> > (3.0-rc*) or linux-next, or some RH internal tree? 
> > This is not critical, though I'd like to try out patches.
>  
> This is a userspace bug not a kernel one.
> There is a workaround, which is to perform the pvmove one LV at a time
> using the --name option.  (For each LV, run pvmove -n <lvname>.)
> 
> The patched code is in the upstream lvm2 repository:
>   git://sources.redhat.com/git/lvm2
>   http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/doc/?cvsroot=lvm2
>   http://sourceware.org/lvm2/
> 
> It was only last night that the code incorporating these changes passed
> our public testsuite for the first time, so I think it is still
> premature to be using this on production systems.  But this means I hope
> to be in a position to make the first development release containing a
> fix for the problems quite soon.  (I added assertions to catch other
> instances of the related problems - it was more than just pvmove
> affected.)
> 

Thanks a lot for your reply.
We don't have a production machines here (just internal servers),
so I guess I could give it a try.


Best,
	Sergey

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