New subject: [Users] about live snapshot and qemu-kvm

Thursday, 20 February 2014

On Mon, 2014-02-17 at 09:59 -0500, Douglas Schilling Landgraf wrote:
...
 On 02/17/2014 02:00 AM, Karli Sjöberg wrote:
 > 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@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-kv...
 >>>
 >>> rhev
 >>>
http://ftp.redhat.com/redhat/linux/enterprise/6Server/en/RHEV/SRPMS/qemu-...
 >>>
 >>
 >> 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(a)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.
 >
 >
 Thanks a lot for the feedback :)

 -- 
 Cheers
 Douglas 
Hey,

have gone through the logs to verify quiescence and the only thing
actually mentioning it comes from vdsm.log:
Thread-127371::DEBUG::2014-02-19
14:54:15,612::BindingXMLRPC::977::vds::(wrapper) return vmSnapshot with
{'status': {'message': 'Done', 'code': 0},
'quiesce': False}

What is it saying really? That quiescing failed, or that it was
deliberately taken without it, or what?

Nothing in qemu-ga.log either, even if changed to "--verbose". Like it
never got any calls to quiesce in the first place. The guest does have
the device[1] attached at least. The guest is CentOS-6.4 or 5, if that
matters.

[1]: /dev/virtio-ports/org.qemu.guest_agent.0

-- 

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(a)slu.se

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

Re: [Users] about live snapshot and qemu-kvm