[ovirt-users] Backups take sooo long, how can I improve the situation, where is the bottleneck?

[Arman Khalatyan]

Hi Florian,
Did you check the IO  load on the SPM host during the backup? If you have
1Gbit network then the maximum theoretical  IO is restricted to 100MB/s .
So if you get 20GB raw preallocated disk then a single disk backup will be
about: 20/0.08/3600 hours x 3times~10mins: .08 is 20% overhead,3time for
the clone-export-deletesnap process.
Vdsm has also restriction on the migration process to avoid the network
saturation. Check the Cluster properties: this is available for the 4.0
capable clusters. or set the migration_max_bandwidth in vdsm.conf on the
hosts.


Am 05.01.2017 6:27 nachm. schrieb "Florian Nolden" <f.nolden at xilloc.com>:

> Hallo everyone,
>
> I would like to update my Ovirt installation but, before that I would like
> to create proper VM backups. Currently I try to automate the backups and I
> use the implementation of the following project.
> https://github.com/wefixit-AT/oVirtBackup
>
> The main idea is to use the Ovirt-API to trigger a snapshot, create a new
> VM from the snapshot, delete the snapshot, export the vm to the export
> domain, delete the vm.
>
> This process takes even with only a 20 GB vm disk 55 Minutes. I have now
> 21 VMs with average 30 GB HDD space, that would mean that the backup job
> runs 22 hours.
>
> Is there something wrong with my setup?
> Config?
> Is there a better way to automate backups?
> Is anyone else doing VM Exports as backup or are you just using snapshots?
>
>
> Specs:
> HA Cluster 3 Nodes each has:
> 2x 6x 2.96 GHz, 96 GB RAM, 120 GB HDD for CentOS7, 1 TB SSD VM-Storage
> (Gluster FS), 4x 1 GBit LAN Bond, 4x 1GBit SAN Bond (Gluster Network,
> connection to Backup NAS/ Export Domain)
> Ovirt 4.0.3
>
> The script output:
> Jan 05 14:12:16: Start backup for: wiki (20 GB)
> Jan 05 14:12:17: Snapshot creation started ...
> Jan 05 14:12:30: Snapshot created
> Jan 05 14:12:40: Clone into VM started ...
> Jan 05 14:36:37: Cloning finished
> Jan 05 14:36:38: Snapshot deletion started ...
> Jan 05 14:59:27: Snapshots deleted
> Jan 05 14:59:28: Export started ...
> Jan 05 15:07:09: Exporting finished
> Jan 05 15:07:09: Delete cloned VM started ...
> Jan 05 15:07:15: Cloned VM deleted
> Jan 05 15:07:15: Duration: 55:0 minutes
> Jan 05 15:07:15: VM exported as wiki_BACKUP_010516
> Jan 05 15:07:15: Backup done for: wiki
> Jan 05 15:07:15: All backups done
>
>
> Thanks,
> Florain
>
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