PrerequisiteYou must be granted the following permissions by your IAM administrator:
- ec2:DescribePlacementGroup: Allows you to see if a placement group exists and to get information about it.
- ec2:DeletePlacementGroup: Allows you to roll back if an issue occurs.
- ec2:CreatePlacementGroup: Allows you to create a placement group to migrate new instances.
You can migrate placement groups as an alternative to scaling instances up or down manually if you do not want to stop the instances.
- Stop the database on a single instance in the system.
# tpareset -x stop system - Verify the database is stopped.
# psh pdestate -w
PDE state: DOWN/HARDSTOP - Start the placement group migration.
# tdc-migrate-placement-group --instance_type <desired instance type>where the desired instance type is r5.4xlarge, r5.8xlarge, r5.12xlarge, r5.16xlarge, or r5.24xlarge, or r6i.4xlarge, r6i.8xlarge, r6i.12xlarge, r6i.16xlarge, or r6i.24xlarge or r6i.32xlarge.The old system remains running. The original instance names have -migrated appended to them. - SSH into the system to verify the new instances are working as expected.After verifying the new system, you can stop or terminate the old instances.