This can also be called a "trespass storm" - this typically a host configuration issue - Veritas DMP if you're using Solaris, HP-UX PVlinks, ESX and NMP.  You need to find out which host(s) is causing this - in the Event Log you should see messages about trespasses - there should be a disk listed - this is one of the disks in the raid group that contains the LUN(s) that are trespassing. It takes a review of the spcollects to determine which LUN(s) are trespassing.  If you go to "ftp.emc.com/incoming/trespass_report" I have put a program what will help you identify which LUNs are causing the trespassing. To use this program, just run if from the folder where you have a recent spcollects ZIPs - you need both SPA and SPB spcollects in the folder.  glen
Hello i am having this error on my CX4-120 any idea   Time Stamp XX/XX/XX XX:XX:XX (GMT) Event Number 71164000 Severity Warning Host B-IMAGE Storage Array CKMXXXXXXX SP N/A Device N/A Description Excessive trespasses detected. Lun: 60060160xxxxxxxx:861A9212xxxxxxxx . Contact Your Service Provider. Run HAVT on the host(s) connected to the LUN in question. 0000040003005600d3040000004016a1004016a1000000000000000000000000000000000000000071164000   
CX4-120 - error event # 71164000 "Description Excessive trespasses detected. 
Lun: 6006..:861..."