can i run hp_rescan or probe-luns in production??

[Tim Nelson]

once you run the fibreutils then run multipath command

if you use nice-names then edit the /etc/multipath.conf file and run multipath again.

[iinfi1]

well,
i never got a chance to do this till now. storage fellow keeps asking me to manage with existing stuff and keeping moving tarring unwanted stuff.
but sooner or later i will do it.

by the following sentence:
once you run the fibreutils then run multipath command

if i understood correctly:

i should run

1. hp_rescan -a
this should be the first step. i hope this wont affect the existing storage mappings
2. multipath -d
this will do a dry run.
how do I know this is dry run is correct. what should i see in the output
3. multipath ?? whats this command?