Accessing a single virtual volume on DELL ME4012 from multiple hosts

Solution 1:

You must not mount an ext4 volume concurrently on two machines. Not seeing data written on one host on the other host is one of the more harmless results. You will also see data corruption, one host overwriting data the other host has written, and worse.

If you want to access files concurrently from several hosts you need a network filesystem like NFS or SMB.

Solution 2:

You should never mount a simple EXT volume on two different hosts. You are going to cause all kinds of issues. If you need access to those files from multiple machines, connect them to a host and share them using SMB/NFS.