On 11/18/20 12:45 PM, heming.zhao@suse.com wrote:

The events is related with (struct mddev) mddev->events. 
you can search it in kernel source code.

Thank you Heming.  I was expecting more of a general view since I'm a
new user.  Sorry I wasn't clear.

What sort of events cause the Event counter to increase?  If it's mainly
whenever the superblock is updated then my question is: What sort of
events cause the superblock to be updated? I can imagine detection of
failed disk, read errors, array checks, commands by user/admin,
assembly-reassembly etc? If an array operates fine for months - without
user intervention,  will the Event counter increase at all?

Thanks.

-- 
Jorge