Troubleshooting multipathd

At work I used linux  native multipathing MPIO provided via device mapper a lot.  I can be a bit hard to troubleshoot.  I have found the best way is to use the interactive console.   From there you can do a lot of things I’ll illustrate the three most common I use:

Show current config

# multipathd -k
>> show config

Reload changes to multipath.conf

#multipathd -k

Check paths

#multipathd -k
>>show paths

In addition the following command out puts a log of debug information that can really help.

multipathd -v4 

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