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nova
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Merge "Update live_migration_downtime definition"

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Zuul 2022-02-23 20:12:03 +00:00 committed by Gerrit Code Review
parent 134c4791ff de110b042d
commit 26e65c3270
2 changed files with 8 additions and 5 deletions
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6
doc/source/admin/configuring-migrations.rst
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@ -263,8 +263,10 @@ memory-intensive instances succeed.
live_migration_downtime_steps = 10
live_migration_downtime_delay = 75
``live_migration_downtime`` sets the maximum permitted downtime for a live
migration, in *milliseconds*. The default is 500.
``live_migration_downtime`` sets the target maximum period of time Nova will
try to keep the instance paused during the last part of the memory copy, in
*milliseconds*. This value may be exceeded if there is any reduction on the
transfer rate after the VM is paused. The default is 500.
``live_migration_downtime_steps`` sets the total number of adjustment steps
until ``live_migration_downtime`` is reached. The default is 10 steps.

7
nova/conf/libvirt.py
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@ -321,13 +321,14 @@ Please refer to the libvirt documentation for further details.
default=500,
min=100,
help="""
Maximum permitted downtime, in milliseconds, for live migration
switchover.
Target maximum period of time Nova will try to keep the instance paused
during the last part of the memory copy, in *milliseconds*.
Will be rounded up to a minimum of 100ms. You can increase this value
if you want to allow live-migrations to complete faster, or avoid
live-migration timeout errors by allowing the guest to be paused for
longer during the live-migration switch over.
longer during the live-migration switch over. This value may be exceeded
if there is any reduction on the transfer rate after the VM is paused.
Related options: