I have a new Mac Pro (black can) running OSC 10.9.3 with a Drobo 5D attached. The Mac is mid-sized (3.5 GHz 6-Core, 32 GB, 500 MB SSD) and the Drobo has 12.84 TB of hard disk with no internal SSD. The Drobo is about 90% full and I’ve been using it for about 7 months. I’ve only had the Mac for 5 months.
About a month ago I noticed that it would occasionally take as much as a minute to move a folder from the Drobo to the trash or to another folder on the Drobo. This seemed to happen more frequently in the last 2 weeks.
Today I used TechTool Pro to rebuild the B Trees on the Drobo. It took 9 hours! When done both B Trees were about 30% smaller. The move problem isn’t completely gone, but the delay time now is no more than 3-4 seconds.
It seems that rebuilding the B Trees every so often is a good idea. Does anyone know of any risks associated with this?