Thanks for the rational discussion, one of the reasons I like Nikonians. Yesterday, my Drobo S went into a 8 hour rebuild mode. None of the drive lights went red, so I dont know which drive is having issues. They are all green again. The log file is encrypted, so I dont know what happened. Based on the discussion, I would have been better off when upgrading the eight x 2 TB drives in the 800i with eight 3 TB drives to just rebuild the system, and restore from a backup rather than replacing the drives one at a time (24-48 hours each) over two weeks. This while dancing around 9 days of power failures post Sandy. I now have a Synology system up and running, which I will be testing as my primary data repository. Once I am happy, the 800i will become the primary backup, and I will convert it to 2-drive failure mode. Beyond this two additional JBOD on/offsite backups.