The drive monitoring events are not visible in the GUI or CLI event lists until something happens.  As this is a background process, and/if when a problem is encountered, the array will mirror the drive to one of the spares (13.2.3: Starting copying-to-spare operation from drive drive-number to drive drive-number).  The mirroring is done improve the performance of a rebuild process. Regarding the volume load balancers, this is discussed here: www.dellstorage.com/.../DownloadAsset.aspx -joe
Over the weekend I've upgraded our units from 5.2.4H1 to 6.0.6. I can't find the exact wording right now but I've read somewhere that after the upgrade to the 6.x line the disks are checked/scrubbed rigorously with some new advanced algorithm to weed out potential errors. Also there should be some new optimized volume load balancing algorithms re-arranging the volumes. Can I monitor this in the event logs?
Monitoring disk checks & volume optimizations after FW upgrade to 6.0.6.?