RHEV: Why does a hypervisor lose networking for a few minutes intermittently, during VM start/stop/migrate/create operations?

Solution Verified - Updated -

Issue

  • A RHEV hypervisor host (RHEV-H or RHEL based) loses connectivity to RHEV-M during VM operations (start/stop/migrate). After a 5-10 minutes, the host is reachable again.
  • A normal RHEL5 (as KVM host) can have similar problem too.

Environment

  • Red Hat Enterprise Virtualization (RHEV) 2.1
  • Red Hat Enterprise Linux 5.5
  • libvirt-0.6.3-33.el5 (or before)

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