Issue with deployment type PERSISTENT_2 storage on FSx for lustre

I understand your frustration with the persistent error message despite having your quota increase requests approved. Let's clarify a few points about FSx for Lustre file systems and their storage capacity limits:

1. For PERSISTENT_2 deployment types using SSD storage, the valid storage capacity values are 1200 GiB, 2400 GiB, and increments of 2400 GiB thereafter.

2. There is a default limit of 100 PERSISTENT_2 file systems per AWS account per region.

3. The error message you're seeing suggests that there's a limit on the total storage capacity across all PERSISTENT_2 file systems in your account, which was initially set to 100800 GiB.

Given that you've had quota increases approved up to 200800 GiB, but are still encountering the error, there could be a few potential issues:

1. The quota increase may not have been fully propagated or applied to your account yet. Sometimes there can be a delay between approval and implementation.

2. You might be hitting a different limit, such as the number of file systems, rather than the total storage capacity.

3. There could be a discrepancy between the approved quota and what's actually set in the system.

To resolve this, I would recommend the following steps:

1. Double-check your current quotas in the Service Quotas console to ensure the increased limit is reflected there.

2. Verify that you're not hitting any other limits, such as the number of file systems.

3. If the issue persists, contact AWS Support. They can verify if the quota increase has been correctly applied to your account and help troubleshoot any other potential issues.

4. When creating the file system, ensure you're specifying a storage capacity that aligns with the valid increments for PERSISTENT_2 deployment types (multiples of 2400 GiB).

Remember, quota increases are specific to each AWS region, so make sure you've requested the increase for the correct region where you're trying to create the file system.
Sources
Quotas for Amazon FSx for Lustre - FSx for Lustre
CreateFileSystem - Amazon FSx