Open Stack

On 06/07, Amy Marrich wrote:
> Hey,
>
> Forwarding to the Dev list as you may get a better response from there.
>
> Thanks,
>
> Amy (spotz)
>

Hi,

I included a good number of improvements regarding bottlenecks on the
backup service in recent releases, some of them are automatic, and
others need configuration tweaks.  But even in older releases there are
a couple of things that can be done to mitigate/fix this situation,
depending on the release you are using.

In general I recommend:

- Using more than one process:

  Use the "backup_processes" option, if available, to run multiple
  subprocesses (like Alan suggested).

  If this option is not available run multiple backup services on the
  same machine (like Duncan suggests), but use a configuration overlay
  to change the host configuration option. That way you won't have
  problems with one service messing up the others' resources at start
  time.

- Increase the native thread pool size: This is even more critical if
  you are using RBD backend:

  Using the "backend_native_threads_pool_size" configuration option [1],
  if available, we can increase the default size.

  If your deployment doesn't have this option, you can still use
  environmental variable "EVENTLET_THREADPOOL_SIZE" to set it in any
  release.

Cheers,
Gorka.

[1]: https://github.com/openstack/cinder/commit/e570436d1cca5cfa89388aec8b2daa63d01d0250

> On Thu, Jul 5, 2018 at 11:30 PM, Keynes Lee/WHQ/Wistron <
> Keynes_Lee at wistron.com> wrote:
>
> > Hi
> >
> >
> >
> > When making “cinder backup-create”
> >
> > We found the process “cinder-backup” use 100% util of 1 CPU core on an
> > OpenStack Controller node.
> >
> > It not just causes a bad backup performance, also make the
> > openstack-cinder-backup unstable.
> >
> > Especially when we make several backup at the same time.
> >
> >
> >
> > The Controller Node has 40 CPU cores.
> >
> > Can we assign more CPU resources to cinder-backup ?
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [image: cid:image007.jpg at 01D1747D.DB260110]
> >
> > *Keynes  Lee    **李* *俊* *賢*
> >
> > Direct:
> >
> > +886-2-6612-1025
> >
> > Mobile:
> >
> > +886-9-1882-3787
> >
> > Fax:
> >
> > +886-2-6612-1991
> >
> >
> >
> > E-Mail:
> >
> > keynes_lee at wistron.com
> >
> >
> >
> >
> >
> >
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