I'm back again with a new question: What must be the file system on AWS EBS Multi-Attach volume?
On this website https://aws.amazon.com/premiumsupport/knowledge-center/ebs-access-volumes-using-multi-attach/
It is written that standard file systems such as XFS, EXT3, EXT4, and NTFS aren't designed to be simultaneously accessed by multiple servers or EC2 instances.
However, they have not written what must be the file systems for AWS EBS Multi-Attach volume.
Any idea? I would be glad if you can provide the command lines for setting the file system.
On this page it's very briefly mentioned that a clustered file system is necessary:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volumes-multi.html#working
In this blog post they explain how to use one clustered file system, the Red Hat Global File System 2 (GFS2), with Multi-Attach EBS. Cluster software must additionally be installed:
Full-Disclosure: I have not actually replicated their results. It was too much overhead for my use case.