Windows Server 2019 sustainable zone shows 20% for a 8 vCPU instance

Question

Using:
4 separate instances of Windows Server 2019 Instance with 32 GB RAM, 8 vCPUs, 640 GB SSD

In the documentation:
"The Linux/Unix $160 USD/month and Windows $240 USD/month (8 vCPUs, 32 GB memory, 640 GB storage) instance plans include a 40% CPU utilization performance baseline."

We observe:
On Amazon LightSail control panel, using the Metrics  CPU overview, (shows the graphic with a Sustainable zone (Green zone)):
One of the four shows a Sustainable zone of 40% (per AWS documentation)
The remaining three show a Sustainable zone of 20% (approximately),

My question is:
What are the possible reasons for the Sustainable zone being so much lower than the documented level of 40%

AWS-SUM · Accepted Answer

Hi David,

It appears you may have Lightsail instances created over a span of time specifically before June 29, 2023 and after. Lightsail updated the instance plans aka bundles then and consequently the older bundles provide a different CPU baseline as compared to the newer ones.

For the 32GB RAM, 8vCPU plans, baseline on older is about 17% per vCPU while that on newer is 40% - this is why the metrics view you see on Lightsail console is showing the different baseline values. Please do note that these performance baselines are per vCPU.

The [document](https://docs.aws.amazon.com/lightsail/latest/userguide/amazon-lightsail-viewing-instance-burst-capacity.html) you referred does note the bundle difference in the context of some other CPU-behavior but is missing the above baseline difference. Thank you for bringing this to our notice.

If you would like to avail the newer bundles, please consider switching your older instance to the newer plans by means of creating instance-snapshots [[doc1]](https://docs.aws.amazon.com/lightsail/latest/userguide/prepare-windows-based-instance-and-create-snapshot.html) of your current instances and creating new instances from these snapshots [[doc2]](https://docs.aws.amazon.com/lightsail/latest/userguide/lightsail-how-to-create-instance-from-snapshot.html) using the Lightsail console.

Thanks.

Riku_Kobayashi · Answer

Hello.

What metrics are you looking at specifically?  
I created a Windows Server 2019 Lightsail instance with the same specs as yours.  
My console only shows one CPU metric with baseline throughput as shown below.  
![a](/media/postImages/original/IMG2YPWmk4TZWLgBDOc7Z4cg)

Maybe your other Lightsail instances are running with lower specs like "2 vCPUs, 4 GB memory, 80 GB storage" instead of "32 GB RAM, 8 vCPUs, 640 GB SSD"?  
Make sure your Lightsail specs are running with "32 GB RAM, 8 vCPUs, 640 GB SSD".  
![a](/media/postImages/original/IMb5tJ_PWrTc-T4YEd14pgHg)

David · Answer

Thanks for your answer. Here are my screen shots.
![Server01](/media/postImages/original/IMpElNV4rISye6j8EFofXnPg)
![Server02](/media/postImages/original/IMtLpfIEbdTWit5b7GK3TdTA)
![Dashboard](/media/postImages/original/IMeVP-StpORxWozo_XF7vIjQ)

Windows Server 2019 sustainable zone shows 20% for a 8 vCPU instance

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