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here are a few steps you can take to troubleshoot and resolve this issue:
Check Dropdown Options: Look through the dropdown menu options to see if there is a suitable device name available for your volume. If you don't see /dev/sda1, try selecting a different available option, such as /dev/xvda, /dev/sdb, etc.
Verify Volume State: Ensure that the volume you are trying to attach is in the "available" state and not already attached to another instance. If it's attached to another instance, detach it from there before attempting to attach it to the new instance.
Refresh Page: Sometimes, the AWS Management Console interface may not update properly. Try refreshing the page or logging out and logging back in to see if the dropdown menu options update.
Use AWS CLI or SDK: If you're comfortable with using the AWS CLI or SDK, you can try attaching the volume using those tools. This can sometimes provide more flexibility and control compared to the web interface.
You can also refer to this guide :- https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/RootDeviceStorage.html
If the "/dev/sda1" option is not available in the selection drop-down, then click on "Specify a custom device name" option and enter "/dev/sda1" manually to mount the EBS volume as root volume.
Thank you, problem solved!
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Thanks for your answer. dev/xvda, /dev/sdb did not work (unable to select any of those) Volume State is available. I also tried to manipulate the web page, but this did not work ether Refresh the page to no avail. Unfortunately, I am not comfortable with CLI. I regularly use this type of attachment, and it’s been working until today. It looks like a bug in the AWS web interface, but for now, my instance is down.