EFS metrics not showing and EC2 cannot write on EFS

Possible reason for slowness in files copy is EFS throughput utilization might have reached to its max limit..any specific error you are getting ? However, You should be able to see the metrics for your EFS as described in [1] using AWS CloudWatch console.

Please note that if your EFS is bursting type throughput mode then the baseline throughput value is depends on capacity stored in standard class and if its provisioned type then you can set the throughput number irrespective of EFS storage used. Please refer [2] for more on this..

If you still have any further issues, I would suggest to reach-out to support for further troubleshooting. [1]: https://docs.aws.amazon.com/efs/latest/ug/efs-metrics.html [2]: https://docs.aws.amazon.com/efs/latest/ug/performance.html