AI Deploy - Scaling strategies
Understand the scaling strategies (static scaling vs autoscaling) of AI Deploy
Last updated 3rd November, 2022.
AI Deploy is in beta. During the beta-testing phase, the infrastructure’s availability and data longevity are not guaranteed. Please do not use this service for applications that are in production, as this phase is not complete.
AI Deploy is covered by OVHcloud Public Cloud Special Conditions.
Objective
This guide covers the use of the different scaling strategies for AI Deploy. The objective is to explain the difference between static scaling and autoscaling so that you can choose the best solution depending on the use case and type of deployment.
Requirements
- a Public Cloud project
- access to the OVHcloud Control Panel
- start deploying an app and get to Step 3:
Resources
Scaling principles
In the OVHcloud Control Panel, it is possible to select the resources in Step 3 of the app deployment.
This step allows you to choose between two scaling strategies: static scaling and autoscaling.
Static scaling
The static scaling strategy allows you to choose the number of replicas on which the app will be deployed.
The minimum number of replicas is 1 and the maximum is 10.
It is recommended to deploy on a minimum of 2 replicas to have high availability!
When to choose static scaling?
- Static scaling can be used if you want to have fixed costs.
- This scaling strategy is also useful when your consumption or inference load are fixed.
Autoscaling
With the autoscaling strategy, you can play on several parameters.
Minimum and maximum number of replicas
With the autoscaling strategy, it is possible to choose both the minimum number of replicas (1 by default) and the maximum number of replicas.
Monitored metric
It is also possible to choose the metric to be monitored. This will act as a trigger for autoscaling. There are two metrics to choose from: CPU or RAM.
Trigger threshold
The threshold for the percentage of average use can also be chosen. It is an integer between 1 and 100%.
The threshold of the average usage percentage will trigger the scaling (up or down) of the app replicas.
High availability will measure the average resource usage across its replicas and add instances if this average exceeds the specified average usage percentage threshold.
Conversely, it will remove instances when this average resource utilisation falls below the threshold.
When to choose autoscaling?
- You can use autoscaling if you have irregular or sawtooth inference loads.
Scaling example
We will use the following example:
In case an app is based on the AI1-1-CPU flavor with a resource size of 2 (i.e. 2 CPUs), this means that each replica of the application will be entitled to 2 vCores and 8GiB RAM.
Example 1
First, we choose an Autoscaling.
Then we set the trigger threshold to 75% of CPU.
In this case, the app will be scaled up when the average CPU usage across all its replicas is above > 1.5 CPU (2*0.75), and it will be scaled down when the average CPU usage falls below < 1.5.
Example 2
In this second example, we choose an Autoscaling.
Then we set the trigger threshold to 60% of RAM.
In this example, the app will be scaled up when the average RAM usage across all its replicas is above > 4.8 GB (8*0.60), and it will be scaled down when the average RAM usage falls below < 4.8 GB again.
The total deployment price will be calculated using the minimum number of replicas.
The cost may increase as Autoscaling increases.
Feedback
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