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Previously, when attempting to add a Red Hat Enterprise Linux 7 host to the Manager for the first time following clean RHEL 7 installation, Vdsm failed to start on the host, and thus the host failed to add. This happened because the multipathd service behaves differently in RHEL 7 from how it behaves in RHEL 6.5. In RHEL 6.5, the multipathd service disables all devices when starting if the multipath configuration file does not exist. Creating a new multipath.conf file and reloading the multipathd service causes multipathd to reload the new configuration, and installation can continue. In RHEL 7, under the same circumstances, the multipathd service behaved differently, and would stop silently, without any error. Reloading the multipathd service failed, because the service was not running. Now, the behavior in RHEL 7 has been modified to simulate that of multipathd on RHEL 6.5 hosts; if the multipath configuration file is missing, the install script creates a new multipath configuration file, and Vdsm successfully reloads the multipathd service during startup.
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