[Users] oVirt 3.3.3 RC EL6 Live Snapshot
Maor Lipchuk
mlipchuk at redhat.com
Mon Feb 3 17:34:54 UTC 2014
On 02/03/2014 07:18 PM, Dafna Ron wrote:
> Maor,
>
> If snapshotVDSCommand is for live snapshot, what is the offline create
> snapshot command?
It is the CreateSnapshotVdsCommand which calls createVolume in VDSM
>
> we did not say that live snapshot did not succeed :) we said that the
> vm is paused and restarted - which is something that should not happen
> for live snapshot (or at least never did before).
It's not sure that the restart is related to the live snapshot. but that
should be observed in the libvirt/vdsm logs.
> as I wrote before, we know that vdsm is reporting the vm as paused, that
> is because libvirt is reporting the vm as paused and I think that its
> happening because libvirt is not doing a live snapshot and so pauses the
> vm while taking the snapshot.
That sounds logic to me, it's need to be checked with libvirt, if that
kind of behaviour could happen.
>
> Dafna
>
>
> On 02/03/2014 05:08 PM, Maor Lipchuk wrote:
>> From the engine logs it seems that indeed live snapshot is called (The
>> command is snapshotVDSCommand see [1]).
>> This is done right after the snapshot has been created in the VM and it
>> signals the qemu process to start using the new volume created.
>>
>> When live snapshot does not succeed we should see in the log something
>> like "Wasn't able to live snapshot due to error:...", but it does not
>> appear so it seems that this worked out fine.
>>
>> At some point I can see in the logs that VDSM reports to the engine that
>> the VM is paused.
>>
>>
>> [1]
>> 2014-02-02 09:41:20,564 INFO
>> [org.ovirt.engine.core.vdsbroker.vdsbroker.SnapshotVDSCommand]
>> (pool-6-thread-49) START, SnapshotVDSCommand(HostName = ovirt002, HostId
>> = 3080fb61-2d03-4008-b47f-9b66276a4257,
>> vmId=e261e707-a21f-4ae8-9cff-f535f4430446), log id: 7e0d7872
>> 2014-02-02 09:41:21,119 INFO
>> [org.ovirt.engine.core.vdsbroker.VdsUpdateRunTimeInfo]
>> (DefaultQuartzScheduler_Worker-93) VM snapshot-test
>> e261e707-a21f-4ae8-9cff-f535f4430446 moved from Up --> Paused
>> 2014-02-02 09:41:30,234 INFO
>> [org.ovirt.engine.core.vdsbroker.vdsbroker.SnapshotVDSCommand]
>> (pool-6-thread-49) FINISH, SnapshotVDSCommand, log id: 7e0d7872
>> 2014-02-02 09:41:30,238 INFO
>> [org.ovirt.engine.core.bll.CreateSnapshotCommand] (pool-6-thread-49)
>> [67ea047a] Ending command successfully:
>> org.ovirt.engine.core.bll.CreateSnapshotCommand
>> ...
>>
>> Regards,
>> Maor
>>
>> On 02/03/2014 06:24 PM, Dafna Ron wrote:
>>> Thanks Steve.
>>>
>>> from the logs I can see that the create snapshot succeeds and that the
>>> vm is resumed.
>>> the vm moves to pause as part of libvirt flows:
>>>
>>> 2014-02-02 14:41:20.872+0000: 5843: debug : qemuProcessHandleStop:728 :
>>> Transitioned guest snapshot-test to paused state
>>> 2014-02-02 14:41:30.031+0000: 5843: debug : qemuProcessHandleResume:776
>>> : Transitioned guest snapshot-test out of paused into resumed state
>>>
>>> There are bugs here but I am not sure yet if this is libvirt regression
>>> or engine.
>>>
>>> I'm adding Elad and Maor since in engine logs I can't see anything
>>> calling for live snapshot (only for snapshot) - Maor, shouldn't live
>>> snapshot command be logged somewhere in the logs?
>>> Is it possible that engine is calling to create snapshot and not create
>>> live snapshot which is why the vm pauses?
>>>
>>> Elad, if engine is not logging live snapshot anywhere I would open a bug
>>> for engine (to print that in the logs).
>>> Also, there is a bug in vdsm log for sdc where the below is logged as
>>> ERROR and not INFO:
>>>
>>> Thread-23::ERROR::2014-02-02
>>> 09:51:19,497::sdc::137::Storage.StorageDomainCache::(_findDomain)
>>> looking for unfetched domain a52938f7-2cf4-4771-acb2-0c78d14999e5
>>> Thread-23::ERROR::2014-02-02
>>> 09:51:19,497::sdc::154::Storage.StorageDomainCache::(_findUnfetchedDomain)
>>>
>>> looking for domain a52938f7-2cf4-4771-acb2-0c78d14999e5
>>>
>>> If the engine was sending live snapshot or if there is no difference in
>>> the two commands in engine side than I would open a bug for libvirt for
>>> pausing the vm during live snapshot.
>>>
>>> Dafna
>>>
>>> On 02/03/2014 02:41 PM, Steve Dainard wrote:
>>>> [root at ovirt002 ~]# vdsClient -s 0 getStorageDomainInfo
>>>> a52938f7-2cf4-4771-acb2-0c78d14999e5
>>>> uuid = a52938f7-2cf4-4771-acb2-0c78d14999e5
>>>> pool = ['fcb89071-6cdb-4972-94d1-c9324cebf814']
>>>> lver = 5
>>>> version = 3
>>>> role = Master
>>>> remotePath = gluster-store-vip:/rep1
>>>> spm_id = 2
>>>> type = NFS
>>>> class = Data
>>>> master_ver = 1
>>>> name = gluster-store-rep1
>>>>
>>>>
>>>> *Steve Dainard *
>>>> IT Infrastructure Manager
>>>> Miovision <http://miovision.com/> | /Rethink Traffic/
>>>> 519-513-2407 ex.250
>>>> 877-646-8476 (toll-free)
>>>>
>>>> *Blog <http://miovision.com/blog> | **LinkedIn
>>>> <https://www.linkedin.com/company/miovision-technologies> | Twitter
>>>> <https://twitter.com/miovision> | Facebook
>>>> <https://www.facebook.com/miovision>*
>>>> ------------------------------------------------------------------------
>>>>
>>>> Miovision Technologies Inc. | 148 Manitou Drive, Suite 101, Kitchener,
>>>> ON, Canada | N2C 1L3
>>>> This e-mail may contain information that is privileged or
>>>> confidential. If you are not the intended recipient, please delete the
>>>> e-mail and any attachments and notify us immediately.
>>>>
>>>>
>>>> On Sun, Feb 2, 2014 at 2:55 PM, Dafna Ron <dron at redhat.com
>>>> <mailto:dron at redhat.com>> wrote:
>>>>
>>>> please run vdsClient -s 0 getStorageDomainInfo
>>>> a52938f7-2cf4-4771-acb2-0c78d14999e5
>>>>
>>>> Thanks,
>>>>
>>>> Dafna
>>>>
>>>>
>>>>
>>>> On 02/02/2014 03:02 PM, Steve Dainard wrote:
>>>>
>>>> Logs attached with VM running on qemu-kvm-rhev packages
>>>> installed.
>>>>
>>>> *Steve Dainard *
>>>> IT Infrastructure Manager
>>>> Miovision <http://miovision.com/> | /Rethink Traffic/
>>>> 519-513-2407 <tel:519-513-2407> ex.250
>>>>
>>>> 877-646-8476 <tel:877-646-8476> (toll-free)
>>>>
>>>> *Blog <http://miovision.com/blog> | **LinkedIn
>>>> <https://www.linkedin.com/company/miovision-technologies> |
>>>> Twitter <https://twitter.com/miovision> | Facebook
>>>> <https://www.facebook.com/miovision>*
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> Miovision Technologies Inc. | 148 Manitou Drive, Suite 101,
>>>> Kitchener, ON, Canada | N2C 1L3
>>>> This e-mail may contain information that is privileged or
>>>> confidential. If you are not the intended recipient, please
>>>> delete the e-mail and any attachments and notify us
>>>> immediately.
>>>>
>>>>
>>>> On Sun, Feb 2, 2014 at 5:05 AM, Dafna Ron <dron at redhat.com
>>>> <mailto:dron at redhat.com> <mailto:dron at redhat.com
>>>> <mailto:dron at redhat.com>>> wrote:
>>>>
>>>> can you please upload full engine, vdsm, libvirt and vm's
>>>> qemu logs?
>>>>
>>>>
>>>> On 02/02/2014 02:08 AM, Steve Dainard wrote:
>>>>
>>>> I have two CentOS 6.5 Ovirt hosts (ovirt001, ovirt002)
>>>>
>>>> I've installed the applicable qemu-kvm-rhev packages
>>>> from this
>>>> site: http://www.dreyou.org/ovirt/vdsm32/Packages/ on
>>>> ovirt002.
>>>>
>>>> On ovirt001 if I take a live snapshot:
>>>>
>>>> Snapshot 'test qemu-kvm' creation for VM
>>>> 'snapshot-test' was
>>>> initiated by admin at internal.
>>>> The VM is paused
>>>> Failed to create live snapshot 'test qemu-kvm' for VM
>>>> 'snapshot-test'. VM restart is recommended.
>>>> Failed to complete snapshot 'test qemu-kvm' creation
>>>> for VM
>>>> 'snapshot-test'.
>>>> The VM is then started, and the status for the
>>>> snapshot
>>>> changes to OK.
>>>>
>>>> On ovirt002 (with the packages from dreyou) I don't
>>>> get any
>>>> messages about a snapshot failing, but my VM is still
>>>> paused
>>>> to complete the snapshot. Is there something else
>>>> other than
>>>> the qemu-kvm-rhev packages that would enable this
>>>> functionality?
>>>>
>>>> I've looked for some information on when the packages
>>>> would be
>>>> built as required in the CentOS repos, but I don't see
>>>> anything definitive.
>>>>
>>>>
>>>> http://lists.ovirt.org/pipermail/users/2013-December/019126.html
>>>> Looks like one of the maintainers is waiting for
>>>> someone to
>>>> tell him what flags need to be set.
>>>>
>>>> Also, another thread here:
>>>> http://comments.gmane.org/gmane.comp.emulators.ovirt.arch/1618
>>>> same maintainer, mentioning that he hasn't seen
>>>> anything in
>>>> the bug tracker.
>>>>
>>>> There is a bug here:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1009100 that seems
>>>> to have ended in finding a way for qemu to expose
>>>> whether it
>>>> supports live snapshots, rather than figuring out how
>>>> to get
>>>> the CentOS team the info they need to build the
>>>> packages with
>>>> the proper flags set.
>>>>
>>>> I have bcc'd both dreyou (packaged the qemu-kvm-rhev
>>>> packages
>>>> listed above) and Russ (CentOS maintainer mentioned in
>>>> the
>>>> other threads) if they wish to chime in and perhaps
>>>> collaborate on which flags, if any, should be set
>>>> for the
>>>> qemu-kvm builds so we can get a CentOS bug report
>>>> going and
>>>> hammer this out.
>>>>
>>>> Thanks everyone.
>>>>
>>>> **crosses fingers and hopes for live snapshots soon**
>>>>
>>>>
>>>>
>>>> *Steve Dainard *
>>>> IT Infrastructure Manager
>>>> Miovision <http://miovision.com/> | /Rethink Traffic/
>>>> 519-513-2407 <tel:519-513-2407> <tel:519-513-2407
>>>> <tel:519-513-2407>> <tel:519-513-2407 <tel:519-513-2407>
>>>> <tel:519-513-2407 <tel:519-513-2407>>> ex.250
>>>> 877-646-8476 <tel:877-646-8476> <tel:877-646-8476
>>>> <tel:877-646-8476>> <tel:877-646-8476 <tel:877-646-8476>
>>>>
>>>> <tel:877-646-8476 <tel:877-646-8476>>> (toll-free)
>>>>
>>>> *Blog <http://miovision.com/blog> | **LinkedIn
>>>>
>>>> <https://www.linkedin.com/company/miovision-technologies> |
>>>> Twitter <https://twitter.com/miovision> | Facebook
>>>> <https://www.facebook.com/miovision>*
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>> Miovision Technologies Inc. | 148 Manitou Drive, Suite
>>>> 101,
>>>> Kitchener, ON, Canada | N2C 1L3
>>>> This e-mail may contain information that is
>>>> privileged or
>>>> confidential. If you are not the intended recipient,
>>>> please
>>>> delete the e-mail and any attachments and notify us
>>>> immediately.
>>>>
>>>>
>>>> On Fri, Jan 31, 2014 at 1:26 PM, Steve Dainard
>>>> <sdainard at miovision.com
>>>> <mailto:sdainard at miovision.com> <mailto:sdainard at miovision.com
>>>> <mailto:sdainard at miovision.com>>
>>>> <mailto:sdainard at miovision.com
>>>> <mailto:sdainard at miovision.com>
>>>>
>>>> <mailto:sdainard at miovision.com
>>>> <mailto:sdainard at miovision.com>>>> wrote:
>>>>
>>>>
>>>> How would you developers, speaking for the
>>>> oVirt-community,
>>>> propose to
>>>> solve this for CentOS _now_ ?
>>>>
>>>> I would imagine that the easiest way is that
>>>> you build and
>>>> host this one
>>>> package(qemu-kvm-rhev), since you´ve basically
>>>> already
>>>> have
>>>> the source
>>>> and recipe (since you´re already providing it
>>>> for RHEV
>>>> anyway). Then,
>>>> once that´s in place, it´s more a question of
>>>> where to
>>>> host the
>>>> packages, in what repository. Be it your own,
>>>> or some
>>>> other
>>>> repo set up
>>>> for the SIG.
>>>>
>>>> This is my view, how I as a user view this
>>>> issue.
>>>>
>>>>
>>>>
>>>> I think this is a pretty valid view.
>>>>
>>>> What would it take to get the correct qemu package
>>>> hosted
>>>> in the
>>>> ovirt repo?
>>>>
>>>> --
>>>>
>>>> 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
>>>> <tel:%2B46-%280%2918-67%2015%2066>
>>>> <tel:%2B46-%280%2918-67%2015%2066>
>>>> <tel:%2B46-%280%2918-67%2015%2066>
>>>> karli.sjoberg at slu.se <mailto:karli.sjoberg at slu.se>
>>>> <mailto:karli.sjoberg at slu.se <mailto:karli.sjoberg at slu.se>>
>>>> <mailto:karli.sjoberg at slu.se
>>>> <mailto:karli.sjoberg at slu.se> <mailto:karli.sjoberg at slu.se
>>>> <mailto:karli.sjoberg at slu.se>>>
>>>>
>>>>
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>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>>
>>>>
>>>> -- Dafna Ron
>>>>
>>>>
>>>>
>>>>
>>>> -- Dafna Ron
>>>>
>>>>
>>>
>
>
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