On Thu, Feb 9, 2023 at 7:03 PM Nir Soffer <nsof...@redhat.com> wrote: > > On Mon, Feb 6, 2023 at 10:00 AM Jean-Louis Dupond via Users > <users@ovirt.org> wrote: > > > > Hi All, > > > > We backup our VM's with a custom script based on the > > https://github.com/oVirt/python-ovirt-engine-sdk4/blob/main/examples/backup_vm.py > > example. > > This works fine, but we start to see scaling issues. > > > > On VM's where there are a lot of dirty blocks, > > We need to see the list of extents returned by the server. > > The easiest way would be to enable debug logs - it will be even slower, > but we will see these logs showing all extents: > > log.debug("Copying %s", ext) > log.debug("Zeroing %s", ext) > log.debug("Skipping %s", ext) > > It will also show other info that can help to understand why it is slow. > > > the transfer goes really > > slow (sometimes only 20MiB/sec). > > Seems much slower than expected > > > At the same time we see that ovirt-imageio process sometimes uses 100% > > CPU > > This is possible, it shows that you do a lot of requests. > > > (its single threaded?). > > It uses thread per connection model. When used with backup_vm.py or other > examples using the ovirt_imageio.client it usually use 4 connections > per transfer > so there will be 4 threads on the server size serving the data. > > Please share debug log of a slow backup, and info about the backup image > storage > for example, is this local file system or NFS?
I opened https://github.com/oVirt/ovirt-imageio/issues/175 to make debugging such issue easier. Nir _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/HP2OZ3E3HAZIE2OCUKXSZIVEDYKQO2DY/
