<p>You can modify several parameters of an existing EBS volume, including volume size, volume type, and IOPS capacity. If your EBS volume is attached to a current-generation EC2 instance type, you might be able to apply these changes without stopping the instance or detaching the volume from it. For more information about modifying EBS volumes, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-modify-volume.html">Amazon EBS Elastic Volumes</a> (Linux instances) or <a href="https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ebs-modify-volume.html">Amazon EBS Elastic Volumes</a> (Windows instances).</p> <p>When you complete a resize operation on your volume, you need to extend the volume's file-system size to take advantage of the new storage capacity. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-expand-volume.html#recognize-expanded-volume-linux">Extend a Linux file system</a> or <a href="https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ebs-expand-volume.html#recognize-expanded-volume-windows">Extend a Windows file system</a>.</p> <p> You can use CloudWatch Events to check the status of a modification to an EBS volume. For information about CloudWatch Events, see the <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/">Amazon CloudWatch Events User Guide</a>. You can also track the status of a modification using <a>DescribeVolumesModifications</a>. For information about tracking status changes using either method, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-volume-modifications.html">Monitor the progress of volume modifications</a>.</p> <p>With previous-generation instance types, resizing an EBS volume might require detaching and reattaching the volume or stopping and restarting the instance.</p> <p>After modifying a volume, you must wait at least six hours and ensure that the volume is in the <code>in-use</code> or <code>available</code> state before you can modify the same volume. This is sometimes referred to as a cooldown period.</p>

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