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Merge "Add saving energy strategy description"

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Jenkins
2017-10-13 04:50:00 +00:00
committed by Gerrit Code Review
parent d5b778b730 4c0d2ab4b2
commit 7f7f7a9fd2
1 changed files with 36 additions and 0 deletions
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36
watcher/decision_engine/strategy/strategies/saving_energy.py
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@@ -29,6 +29,42 @@ LOG = log.getLogger(__name__)
class SavingEnergy(base.SavingEnergyBaseStrategy):
"""Saving Energy Strategy
Saving Energy Strategy together with VM Workload Consolidation Strategy
can perform the Dynamic Power Management (DPM) functionality, which tries
to save power by dynamically consolidating workloads even further during
periods of low resource utilization. Virtual machines are migrated onto
fewer hosts and the unneeded hosts are powered off.
After consolidation, Saving Energy Strategy produces a solution of powering
off/on according to the following detailed policy:
In this policy, a preset number(min_free_hosts_num) is given by user, and
this min_free_hosts_num describes minimum free compute nodes that users
expect to have, where "free compute nodes" refers to those nodes unused
but still powered on.
If the actual number of unused nodes(in power-on state) is larger than
the given number, randomly select the redundant nodes and power off them;
If the actual number of unused nodes(in poweron state) is smaller than
the given number and there are spare unused nodes(in poweroff state),
randomly select some nodes(unused,poweroff) and power on them.
In this policy, in order to calculate the min_free_hosts_num,
users must provide two parameters:
* One parameter("min_free_hosts_num") is a constant int number.
This number should be int type and larger than zero.
* The other parameter("free_used_percent") is a percentage number, which
describes the quotient of min_free_hosts_num/nodes_with_VMs_num,
where nodes_with_VMs_num is the number of nodes with VMs running on it.
This parameter is used to calculate a dynamic min_free_hosts_num.
The nodes with VMs refer to those nodes with VMs running on it.
Then choose the larger one as the final min_free_hosts_num.
"""
def __init__(self, config, osc=None):