[ovirt-users] Live Migration / Snapshots- CentOS 6.5

Sun Jul 6 07:08:31 UTC 2014

Den 6 jul 2014 08:17 skrev Brad Bendy <brad.bendy at gmail.com>:
>
> Is normal behavior a outage when a snapshot occurs? Ive got the rhev
> builds installed but when I take a snap im getting well over two
> minutes of downtime, on a VM with zero usage.

That behavior is expected, engine pauses the VM during snapshot to ensure consistency. Not as sure about the timeframe though; two mins for a idle VM? When I snap, it's a matter if seconds, but that might be your Gluster spooking. We use a traditional NFS server. Why not set that up and benchmark the difference?

/K

> The VM goes into "pause"
> state then, I guess the snapshot is a copy of the entire VM? I have
> not got a second host up with those rhev build to see the behavior
> when disk migrating
>
> Thanks
>
> On Sat, Jul 5, 2014 at 7:51 AM, Brad Bendy <brad.bendy at gmail.com> wrote:
> > There we go, sorry about that! Ill give these a test then. Thanks for the help
> >
> > On Sat, Jul 5, 2014 at 7:39 AM, Karli Sjöberg <Karli.Sjoberg at slu.se> wrote:
> >>
> >> Den 5 jul 2014 16:22 skrev Brad Bendy <brad.bendy at gmail.com>:
> >>
> >>
> >>>
> >>> Haha, yeah never have been a Fedora fan, and nothing has changed. Is
> >>> the only big feature im missing out on is snapshots? From what I can
> >>> tell, and in my testing, everything else seems to work. Was deploying
> >>> GlusterFS but without the live migration to another host that is
> >>> somewhat defeated.
> >>
> >> VM live migration works, live _disk_ migration does not.
> >>
> >>> Only way to get that is with RHEL really then?
> >>
> >> No, as I earlier pointed out, there is a place you can get the packages you
> >> need for CentOS:
> >> http://jenkins.ovirt.org/view/All/job/qemu-kvm-rhev_create-rpms_el6/lastStableBuild/
> >>
> >> You'll have to download- and force install them over the already installed
> >> versions of those packages on all Hosts and then it'll work.
> >>
> >> Though, next time there are updates, yum will update from the standard repos
> >> and it just stops working again until you repeat the procedure.
> >>
> >> /K
> >>
> >>>
> >>> On Sat, Jul 5, 2014 at 7:05 AM, Karli Sjöberg <Karli.Sjoberg at slu.se>
> >>> wrote:
> >>> >
> >>> > Den 5 jul 2014 15:57 skrev Brad Bendy <brad.bendy at gmail.com>:
> >>> >
> >>> >
> >>> >>
> >>> >> If I use Fedora will "everything" work? I had numerous issues, IIRC I
> >>> >> could not even get the ovirtmgmt switch to install and a few other
> >>> >> things. What version of Fedora do you recommend then?
> >>> >
> >>> > None:) We switched long ago to CentOS and have never looked back, even
> >>> > with
> >>> > these issues. Not worth the headache that is Fedora.
> >>> >
> >>> > /K
> >>> >
> >>> >> Ill do another
> >>> >> install and give that a whirl again.
> >>> >>
> >>> >> Thanks!
> >>> >>
> >>> >> On Fri, Jul 4, 2014 at 10:33 PM, Karli Sjöberg <Karli.Sjoberg at slu.se>
> >>> >> wrote:
> >>> >> >
> >>> >> > Den 5 jul 2014 07:04 skrev Brad Bendy <brad.bendy at gmail.com>:
> >>> >> >>
> >>> >> >> Hi,
> >>> >> >>
> >>> >> >> Ive seeing conflicting info with what version of qemu rpms are
> >>> >> >> needed
> >>> >> >> to do live migration under CentOS. It appears the stock ones will
> >>> >> >> not
> >>> >> >> work and the RHEV ones are required. All the mailing list post I see
> >>> >> >> are from 3-4 months ago, so not sure.
> >>> >> >>
> >>> >> >> Im getting VDSGenericException: VDSErrorException: Failed to
> >>> >> >> SnapshotVDS, error = Snapshot failed, code = 48 (Failed with error
> >>> >> >> SNAPSHOT_FAILED and code 48)
> >>> >> >>
> >>> >> >> I also saw this thread:
> >>> >> >> http://comments.gmane.org/gmane.linux.centos.general/138593
> >>> >> >>
> >>> >> >> Ive been having issues getting those to install, but before I spent
> >>> >> >> to
> >>> >> >> much more time I wanted to really see if I was on the right track.
> >>> >> >>
> >>> >> >> Is there a better OS choice? I first started trying with Fedora 19
> >>> >> >> and
> >>> >> >> 20 and has major issues, went to CentOS 6.5 and this is the first
> >>> >> >> and
> >>> >> >> only issue so far ive ran into.
> >>> >> >>
> >>> >> >> Thanks!
> >>> >> >> _______________________________________________
> >>> >> >> Users mailing list
> >>> >> >> Users at ovirt.org
> >>> >> >> http://lists.ovirt.org/mailman/listinfo/users
> >>> >> >
> >>> >> > Well, going with Fedora would at least get you the snapshots working,
> >>> >> > if
> >>> >> > I remember correctly, but that's not something you run in production.
> >>> >> > As you
> >>> >> > said, "major issues".
> >>> >> >
> >>> >> > For CentOS, you need "special" versions of certain packages, since
> >>> >> > RedHat wants you to pay for RHEV, they have chosen to cripple the
> >>> >> > standard
> >>> >> > packages so those features won't work:
> >>> >> > http://lists.ovirt.org/pipermail/devel/2014-June/007735.html
> >>> >> >
> >>> >> > And here you can find the packages you need:
> >>> >> >
> >>> >> >
> >>> >> > http://jenkins.ovirt.org/view/All/job/qemu-kvm-rhev_create-rpms_el6/lastStableBuild/
> >>> >> >
> >>> >> > /K
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