このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
efs dns not resolving
対処
関連リンク
AWS Developer Forums: EFS DNS ...
https://forums.aws.amazon.com/thread.jspa?threadID=244113
Can't Mount EFS on to my EC2 instance ...
https://forums.aws.amazon.com/thread.jspa?threadID=236697
EFS Mount Error ...
https://forums.aws.amazon.com/thread.jspa?threadID=235499
Unable to mount EFS on an EC2 instance ...
https://forums.aws.amazon.com/thread.jspa?threadID=235344
Docker mount cannot access EFS mount ...
https://forums.aws.amazon.com/thread.jspa?threadID=235119
Amazon EFS のトラブルシューティング - Amazon Elastic File System
https://docs.aws.amazon.com/ja_jp/efs/latest/ug/troubleshooting.html
大量のデータを書き込みして ...
https://docs.aws.amazon.com/ja_jp/efs/latest/ug/troubleshooting.html#application-large-data-hangs
Oracle Recovery Manager ...
https://docs.aws.amazon.com/ja_jp/efs/latest/ug/troubleshooting.html#oracle-backup-slow
chown ができない
https://docs.aws.amazon.com/ja_jp/efs/latest/ug/troubleshooting.html#chown-kernal
マウントの問題のトラブルシューティング - Amazon Elastic File System
https://docs.aws.amazon.com/ja_jp/efs/latest/ug/troubleshooting-efs-mounting.html