I have an EBS volume that displays a state of "in-use - optimizing(%)". What does this mean? What are the optimizations that AWS is performing? This is on a 300gb encrypted gp2 volume attached to a Windows Server 2012 R2 EC2 instance.
If you must modify the volume while it's still in the Optimizing state, then use the following workaround solution: Use an Amazon EBS snapshot to restore a new EBS volume of the desired configurations. You can use an existing snapshot or create a new snapshot.
An Amazon EBS-optimized instance uses an optimized configuration stack and provides additional, dedicated capacity for Amazon EBS I/O. This optimization provides the best performance for your EBS volumes by minimizing contention between Amazon EBS I/O and other traffic from your instance.
To maximize the performance of gp3, we recommend using EBS-optimized EC2 instances. gp2 is the default EBS volume type for Amazon EC2 instances.
The in-use - optimizing
state relates to EBS volume resizing.
in-use
indicates that this volume is attached to an EC2 instance.optimizing
is the volume's modification state.According to the AWS documentation on volume modifications:
An EBS volume being modified goes through a sequence of states. After you issue a
ModifyVolume
directive, whether from the console, CLI, API, or SDK, the volume enters first theModifying
state, then theOptimizing
state, and finally theComplete
state....
While the volume is in the optimizing state, your volume performance is in between the source and target configuration specifications. Transitional volume performance will be no less than the source volume performance. If you are downgrading IOPS, transitional volume performance is no less than the target volume performance.
And finally, from the introductory blog post for Volume Modifications:
The volume’s state reflects the progress of the operation (modifying, optimizing, or complete):
If you modified the volume, most likely it will show like that. The performance will be degraded during this time since AWS EBS server needs to sync data.
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