Hi,  You can refer Primus emc220396 for Event number 720e.  This might help...  -Madhusudan
Alert:   Time Stamp 07/25/10 13:14:34 (GMT) Event Number 720e Severity Warning Host CX4_960_SPA Storage Array XXXXXXXXXX SP A Device N/A Description Initiator (xx:xx:xx:aa:xx:xx:xx:xx:xx:xx:xx:aa:xx:xx:xx:xx:) on Server (abc) registered with the storage system is now inactive. It does not have a working physical connection. See Navisphere Manager for details.   Above alert receiving when Server reboots.   Analyzed SP collects, SWITCH Logs and confirmed that no issues with Storage and Switch from EMC support.   This host has two HBA. Why getting problem for one initiator? We restarted this server so many times –  we never   receive  the alert  before  July 25th . No changes done in SAN. Confused why this alert receiving now- why not earlier.    Please any one can help me to solve this issue.
Clarion Alert Event Number 720e