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Diffstat (limited to 'releasenotes/notes/remove-default-cputune-shares-values-85d5ddf4b8e24eaa.yaml')
| -rw-r--r-- | releasenotes/notes/remove-default-cputune-shares-values-85d5ddf4b8e24eaa.yaml | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/releasenotes/notes/remove-default-cputune-shares-values-85d5ddf4b8e24eaa.yaml b/releasenotes/notes/remove-default-cputune-shares-values-85d5ddf4b8e24eaa.yaml new file mode 100644 index 0000000000..9dd0987bb8 --- /dev/null +++ b/releasenotes/notes/remove-default-cputune-shares-values-85d5ddf4b8e24eaa.yaml @@ -0,0 +1,15 @@ +upgrade: + - | + In the libvirt driver, the default value of the ``<cputune><shares>`` + element has been removed, and is now left to libvirt to decide. This is + because allowed values are platform dependant, and the previous code was + not guaranteed to be supported on all platforms. If any of your flavors are + using the quota:cpu_shares extra spec, you may need to resize to a + supported value before upgrading. + + To facilitate the transition to no Nova default for ``<cputune><shares>``, + its value will be removed during live migration unless a value is set in + the ``quota:cpu_shares`` extra spec. This can cause temporary CPU + starvation for the live migrated instance if other instances on the + destination host still have the old default ``<cputune><shares>`` value. To + fix this, hard reboot, cold migrate, or live migrate the other instances. |