On the VNX5500 unless you have cleared the log, there should be entries for at least 30 days in the logs - you just need to keep scrolling down in the Event Log and it should refresh with older logs.  You can also run the SPcollects from Unisphere - that collects logs that could go back at least 30 days and longer depending on the activity on the array.  glen
I have a VNX 5500 and several drives failed a few weeks ago,  Is there a way to go into the event log and find when the drives failed and which drives they were?   All I see now are events from the past few days.  Thanks
How to pull up past events such as drive failure