Greetings, I have a 2nd Gen Drobo that was populated with 4 drives totaling 7Tb. The Drobo showed that it was over 70 percent full so I decided I was going to replace the smallest drive in the cluster with a larger on. All drives in question are Seagate. So I did the swap and the Drobo started rebuilding and showed only 54 percent. All was right. The rebuild took about 36 hours and all lights were green. The next day there was a red light on the drive that I had just inserted and the other remaining drive were engaged in another rebuild. OK, so I purchase a new HD in anticipation of the completion of the next rebuild. The next day I came home to the same three flashing green and yellow lights and the one red. Drobodashboard stated that there was 7 hours remaining in the build. The next day (21hours later) the same lights are flashing and there are dozens of errors showing on my screen that the drive was improperly ejected. (Mac OS 10.10.5). Come to find out the Drobo was rebooting every 5 minutes.
Machine boots and shuts-down fine with no drives. I have updated the firmware. No change. I have tried every known combinations of drives with no luck including inserting a new blank drive. I have a back-up of all the important data. What is left that is not backed up is one folder with numerous .dmg files. I could format the discs and restore the main set of files, but I want to try to get that one set of files off before trying that extreme an option. However, the machine will not stay online for more than 2-3 minutes. Are there any known cures for this problem?!