2016-03-28 04:23 PM
NetApp has recently updated KB Article https://kb.netapp.com/support/index?page=content&id=7010235&locale=en_US
This KB lists some drive Models that have higher failure rate.
The fix is to upgrade the disk firmware.
You migh be hitting a Bug and upgrading the drive firmware might fix it.
Hope there are no environment issues in the data center.