[ovirt-users] Ovirt backups lead to unresponsive VM

[Alex K]

Hi all,

Are there any examples on using ovirt-imageio to backup a VM or where I
could find details of RESTAPI for this functionality?
I might attempt to write a python script for this purpose.

Thanx,
Alex

On Tue, Feb 13, 2018 at 8:59 PM, Alex K <rightkicktech at gmail.com> wrote:

> Thank you Nir for the below.
>
> I am putting some comments inline in blue.
>
>
> On Tue, Feb 13, 2018 at 7:33 PM, Nir Soffer <nsoffer at redhat.com> wrote:
>
>> On Wed, Jan 24, 2018 at 3:19 PM Alex K <rightkicktech at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I have a cluster with 3 nodes, using ovirt 4.1 in a self hosted setup on
>>> top glusterfs.
>>> On some VMs (especially one Windows server 2016 64bit with 500 GB of
>>> disk). Guest agents are installed at VMs. i almost always observe that
>>> during the backup of the VM the VM is rendered unresponsive (dashboard
>>> shows a question mark at the VM status and VM does not respond to ping or
>>> to anything).
>>>
>>> For scheduled backups I use:
>>>
>>> https://github.com/wefixit-AT/oVirtBackup
>>>
>>> The script does the following:
>>>
>>> 1. snapshot VM (this is done ok without any failure)
>>>
>>
>> This is a very cheap operation
>>
>>
>>> 2. Clone snapshot (this steps renders the VM unresponsive)
>>>
>>
>> This copy 500g of data. In gluster case, it copies 1500g of data, since
>> in glusterfs, the client
>> is doing the replication.
>>
>> Maybe your network or gluster server is too slow? Can you describe the
>> network topology?
>>
>> Please attach also the volume info for the gluster volume, maybe it is
>> not configured in the
>> best way?
>>
>
> The network is 1Gbit. The hosts (3 hosts) are decent ones and new hardware
> with each host having: 32GB RAM, 16 CPU cores and 2 TB of storage in
> RAID10.
> The VMS hosted (7 VMs) exhibit high performance. The VMs are Windows 2016
> and Windows10.
> The network topology is: two networks defined at ovirt: ovirtmgmt is for
> the managment and access network and "storage" is a separate network, where
> each server is connected with two network cables at a managed switch with
> mode 6 load balancing. this storage network is used for gluster traffic.
> Attached the volume configuration.
>
>> 3. Export Clone
>>>
>>
>> This copy 500g to the export domain. If the export domain is on glusterfs
>> as well, you
>> copy now another 1500g of data.
>>
>>
> Export domain a Synology NAS with NFS share.  If the cloning succeeds then
> export is completed ok.
>
>> 4. Delete clone
>>>
>>> 5. Delete snapshot
>>>
>>
>> Not clear why do you need to clone the vm before you export it, you can
>> save half of
>> the data copies.
>>
> Because I cannot export the VM while it is running. It does not provide
> such option.
>
>>
>> If you 4.2, you can backup the vm *while the vm is running* by:
>> - Take a snapshot
>> - Get the vm ovf from the engine api
>> - Download the vm disks using ovirt-imageio and store the snaphosts in
>> your backup
>>   storage
>> - Delete a snapshot
>>
>> In this flow, you would copy 500g.
>>
>> I am not aware about this option. checking quickly at site this seems
> that it is still half implemented? Is there any script that I may use and
> test this? I am interested to have these backups scheduled.
>
>
>> Daniel, please correct me if I'm wrong regarding doing this online.
>>
>> Regardless, a vm should not become non-responsive while cloning. Please
>> file a bug
>> for this and attach engine, vdsm, and glusterfs logs.
>>
>>
> Nir
>>
>> Do you have any similar experience? Any suggestions to address this?
>>>
>>> I have never seen such issue with hosted Linux VMs.
>>>
>>> The cluster has enough storage to accommodate the clone.
>>>
>>>
>>> Thanx,
>>>
>>> Alex
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
>
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