Public bug reported:
I'm running nova trunk, commit 752954a.
I configured a flavor with two vcpus and extra specs
"hw:cpu_policy=dedicated" in order to enable vcpu pinning.
I booted up a number of instances such that there was one instance
affined to host cpus 12 and 13 on compute-0, and another instance
affined to cpus 12 and 13 on compute-2. (As reported by "virsh vcpupin"
and "virsh dumpxml".)
I then triggered a live migration of one instance from compute-0 to
compute-2. This resulted in both instances being affined to host cpus
12 and 13 on compute-2.
The "hw:cpu_policy=dedicated" extra spec is intended to provide
dedicated host cpus for the instance. In order to provide this, on a
live migration (or cold migration, or rebuild, or evacuation, or resize,
etc.) nova needs to ensure that the instance is affined to host cpus
that are not currently being used by other instances.
** Affects: nova
Importance: Undecided
Status: New
** Tags: compute
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https://bugs.launchpad.net/bugs/1417667
Title:
migration/evacuation/rebuild/resize of instance with dedicated cpus
needs to recalculate cpus on destination
Status in OpenStack Compute (Nova):
New
Bug description:
I'm running nova trunk, commit 752954a.
I configured a flavor with two vcpus and extra specs
"hw:cpu_policy=dedicated" in order to enable vcpu pinning.
I booted up a number of instances such that there was one instance
affined to host cpus 12 and 13 on compute-0, and another instance
affined to cpus 12 and 13 on compute-2. (As reported by "virsh
vcpupin" and "virsh dumpxml".)
I then triggered a live migration of one instance from compute-0 to
compute-2. This resulted in both instances being affined to host cpus
12 and 13 on compute-2.
The "hw:cpu_policy=dedicated" extra spec is intended to provide
dedicated host cpus for the instance. In order to provide this, on a
live migration (or cold migration, or rebuild, or evacuation, or
resize, etc.) nova needs to ensure that the instance is affined to
host cpus that are not currently being used by other instances.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1417667/+subscriptions
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