Hadoop node disk failure - reinstall question

[Mayuran Yogarajah]

One of our nodes died today, it looks like the disk containing the OS 
expired.  I will need to reinstall the machine.
Are there any known issues with using the same hostname / IP again, or 
is it better to give it a new IP / host name ?

The second disk on the machine is still operational and contains HDFS 
data so I plan on mounting it.  Is this ill-advised? Should I just wipe 
that disk too ?

thanks,
M