yahoo-eng-team team mailing list archive

[tom king <kingttx@xxxxxxxxx>]

Public bug reported:

In a vSphere-backed OpenStack, a fair number of instance actions
(creating an instance, live-migrating an instance, and detaching
interfaces for examples) cause a Nova sync power process to be kicked
off.

Large compute clusters (thousands of VMs) suffer bad performance when an
instance action kicks off multiple syncs. For example, instance creation
can take anywhere from 5 - 20 minutes if many of these syncs are in
flight.

Some of these syncs shouldn't process the entire cluster if they are
specific to the instance, unless there are some other hidden/unknown
considerations. A sync of a single instance that is having its interface
detached shouldn't require a sync of the entire cluster.

** Affects: nova
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1835958

Title:
  Nova sync power state on large clusters causes poor performance

Status in OpenStack Compute (nova):
  New

Bug description:
  In a vSphere-backed OpenStack, a fair number of instance actions
  (creating an instance, live-migrating an instance, and detaching
  interfaces for examples) cause a Nova sync power process to be kicked
  off.

  Large compute clusters (thousands of VMs) suffer bad performance when
  an instance action kicks off multiple syncs. For example, instance
  creation can take anywhere from 5 - 20 minutes if many of these syncs
  are in flight.

  Some of these syncs shouldn't process the entire cluster if they are
  specific to the instance, unless there are some other hidden/unknown
  considerations. A sync of a single instance that is having its
  interface detached shouldn't require a sync of the entire cluster.

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1835958/+subscriptions