How to append server name to everyline?

I am executing df -mP to see the disk utilization.
I would like to append servername also to each and every line.

 
df -mP |  awk '{ print $1","$2","$3","$4","$5","$6 }' 

trying to add something like this

 
df -mP |  awk '{ print $1","$2","$3","$4","$5","$6","$hostname }'  

to get the hostname along with the output but could not succeed .

Need help on this

Try:

df -mP | awk -v hostname="$(hostname)" '{print $1","$2","$3","$4","$5","$6","hostname}'