A host cannot recognize multipath. What should I do?

Symptom

Running multipath -ll on the host shows no multipath devices.

Cause

The multipath configuration file on the host is incorrect.

Solution

1. Check whether the /etc/multipath.conf file on the affected host differs from the file on a healthy host.

2. On the host, run the following command to copy the /etc/multipath.conf file from a healthy host to the affected host:

   [root@localhost ~]# scp /etc/multipath.conf root@IP:/etc/