yahoo-eng-team team mailing list archive

[Dan Smith <dms@xxxxxxxxxxxxx>]

Public bug reported:

Nova will accept an unbounded number of live migrations for a single
host, which will result in timeouts and failures (at least for libvirt).
Since live migrations are seriously IO intensive, allowing this to be
unlimited is just never going to be the right thing to do, especially
when we have functions in our own client to live migrate all instances
to other hosts (nova host-evacuate-live).

We recently added a build semaphore to allow capping the number of
parallel builds being attempted on a compute host for a similar reason.
This should be the same sort of thing for live migration.

** Affects: nova
     Importance: Low
         Status: New

** Changed in: nova
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1478108

Title:
  Live migration should throttle itself

Status in OpenStack Compute (nova):
  New

Bug description:
  Nova will accept an unbounded number of live migrations for a single
  host, which will result in timeouts and failures (at least for
  libvirt). Since live migrations are seriously IO intensive, allowing
  this to be unlimited is just never going to be the right thing to do,
  especially when we have functions in our own client to live migrate
  all instances to other hosts (nova host-evacuate-live).

  We recently added a build semaphore to allow capping the number of
  parallel builds being attempted on a compute host for a similar
  reason. This should be the same sort of thing for live migration.

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