Hello Paride & all,

sorry for the late reply but I was on vacation last week.
I found a solution/workaround now but it's a little bit strange.

Background: Oracle is offering different shapes of virtual machines.
In the OCFS2 cluster we are using:
VM.Standard.E4.Flex (AMD)
VM.Standard3.Flex (Intel)

These machines use different virtual NICs too.

I did upgrades to kernel Ubuntu-oracle-5.13.0.1018.22~20.04.1 (and some
other packages).

After these upgrades the problem was gone in our testing cluster, where
both VMs run on VM.Standard.E4.Flex (AMD).

In the (planned) production cluster, which runs on mixed VMs 
(VM.Standard.E4.Flex / VM.Standard3.Flex) the problem was still present.
So I changed the shape from the 2nd VM from Intel to AMD  - same as in testing 
environment - and the problem was gone too.

In summary:
Upgrade to Ubuntu-oracle-5.13.0.1018 solves the problem, but only when all 
cluster machines have same VM shape (and/or possibly same type of NIC).
For the case that the machines run on different VM shapes (and NICs?) the 
problem remains the same.

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https://bugs.launchpad.net/bugs/1959581

Title:
  OCFS2 intermittently not mountable on a second Node in Ubuntu 20.04.3
  LTS

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