[Users] about live snapshot and qemu-kvm

[Karli Sjöberg]

On Thu, 2014-02-13 at 14:42 -0500, Douglas Schilling Landgraf wrote:
> On 01/01/2014 06:24 AM, Gianluca Cecchi wrote:
> > On Wed, Jan 1, 2014 at 4:38 AM, R P Herrold  wrote:
> >
> >>
> >> Out of curiousity, _what_ build environment 'flags' do you
> >> all, participating in this thread, refer to? -- the thread
> >> does not enumerate them explicitly, and one cannot expect to
> >> hit by 'indirect fire', a target not exposed
> >>
> >> With best regards, this New Year's eve
> >
> > I'm far from being a programmer, but as I went to compare build
> > environments, between
> > qemu-kvm-rhev-0.12.1.2-2.415.el6_5.3.src.rpm
> > and
> > qemu-kvm-0.12.1.2-2.415.el6_5.3.src.rpm
> > in related spec file I see
> > [g.cecchi at tekkaman SPECS]$ diff qemu-kvm.spec.upstream qemu-kvm.spec.rhev
> > 3c3
> > < %define rhev 0
> > ---
> >> %define rhev 1
> > 12928a12929
> >>>>>>>>> rhel-6.5
> >
> > and apart other probably not trivial implications, such as guest agent
> > part, I see that the "configure" command takes one extra argument in
> > base RH EL 6.5, that is
> >
> > --disable-rhev-features
> >
> > The only patch file containing this keyword is
> >
> > kvm-Block-streaming-disable-for-RHEL.patch
> >
> > and inside it there are these lines that impacts configure options and
> > related built qemu-kvm:
> >
> > --- a/configure
> > +++ b/configure
> > @@ -286,6 +286,7 @@ spice=""
> >   smartcard=""
> >   smartcard_nss=""
> >   live_snapshots="yes"
> > +block_stream="yes"
> >   usb_redir=""
> >
> >   # OS specific
> > @@ -686,10 +687,22 @@ for opt do
> >     ;;
> >     --enable-live-snapshots) live_snapshots="yes"
> >     ;;
> > +  --disable-block-stream) block_stream="no"
> > +  ;;
> > +  --enable-block-stream) block_stream="yes"
> > +  ;;
> >     --disable-usb-redir) usb_redir="no"
> >     ;;
> >     --enable-usb-redir) usb_redir="yes"
> >     ;;
> > +  --disable-rhev-features)
> > +       live_snapshots="no";
> > +       block_stream="no";
> > +  ;;
> > +  --enable-rhev-features)
> > +       live_snapshots="yes";
> > +       block_stream="yes";
> > +  ;;
> >     *) echo "ERROR: unknown option $opt"; show_help="yes"
> >     ;;
> >     esac
> > @@ -863,8 +876,12 @@ echo "  --disable-smartcard-nss  disable
> > smartcard nss support"
> >   echo "  --enable-smartcard-nss   enable smartcard nss support"
> >   echo "  --disable-live-snapshots disable live block device snapshot support"
> >   echo "  --enable-live-snapshots  enable live block device snapshot support"
> > +echo "  --disable-block-stream   disable block streaming support"
> > +echo "  --enable-block-stream    enable block streaming support"
> >   echo "  --disable-usb-redir      disable usb network redirection support"
> >   echo "  --enable-usb-redir       enable usb network redirection support"
> > +echo "  --disable-rhev-features  disable RHEV-only features"
> > +echo "  --enable-rhev-features   enable RHEV-only features"
> >   echo ""
> >   echo "NOTE: The object files are built at the place where configure
> > is launched"
> >   exit 1
> > @@ -2271,6 +2288,7 @@ echo "Trace backend     $trace_backend"
> >   echo "spice support     $spice"
> >   echo "nss used          $smartcard_nss"
> >   echo "Live snapshots    $live_snapshots"
> > +echo "Block streaming   $block_stream"
> >   echo "xfsctl support    $xfs"
> >   echo "usb net redir     $usb_redir"
> >
> > @@ -2526,6 +2544,10 @@ if test "$live_snapshots" = "yes" ; then
> >     echo "CONFIG_LIVE_SNAPSHOTS=y" >> $config_host_mak
> >   fi
> >
> > +if test "$block_stream" = "yes" ; then
> > +  echo "CONFIG_BLOCK_STREAM=y" >> $config_host_mak
> > +fi
> > +
> >   if test "$usb_redir" = "yes" ; then
> >     echo "CONFIG_USB_REDIR=y" >> $config_host_mak
> >   fi
> >
> > I don't think the rhev argument has instead implications in upstream
> > source qemu-kvm-0.12.1.2.tar.gz
> > So I think that if you want to dig more and if you have more
> > competences, you have to see the full spec file and the full patch
> > above.
> >
> > Files downloaded here:
> >
> > upstream
> > http://ftp.redhat.com/redhat/linux/enterprise/6Server/en/os/SRPMS/qemu-kvm-0.12.1.2-2.415.el6_5.3.src.rpm
> >
> > rhev
> > http://ftp.redhat.com/redhat/linux/enterprise/6Server/en/RHEV/SRPMS/qemu-kvm-rhev-0.12.1.2-2.415.el6_5.3.src.rpm
> >
> 
> Just for the record, we have setup a jenkins job to rebuild qemu-kvm for 
> el6 until we get it officially from centos:
> http://jenkins.ovirt.org/view/Packaging/job/qemu-kvm-rhev_create_rpms_el6/
> 
> -- 
> Cheers
> Douglas
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users

I think this calls for an oldschool question/statement;

Who da man? ... You da man! :)

Live snapshot now just works. Haven´t verified quiesce yet though, but
looks good as far as the events in webadmin is concerned. Next to test
is live disk migration.


-- 

Med Vänliga Hälsningar

-------------------------------------------------------------------------------
Karli Sjöberg
Swedish University of Agricultural Sciences Box 7079 (Visiting Address
Kronåsvägen 8)
S-750 07 Uppsala, Sweden
Phone:  +46-(0)18-67 15 66
karli.sjoberg at slu.se