Slow Moving Files - Partial Solution

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?

hi rich, i’ve heard about that i think in another (possibly referenced) thread here on the forums.

i think in that particular case, something went wrong, and they tried b trees and related tools to try and fix the problem, but also that if not done strictly in the correct way, that it could muck it all up :slight_smile:

well done for your progress so far, but do be careful, and try and backup all your data (in a verified way) before you try pruning those trees :smiley:

just also wondering how big that folder was, and how many files of what size were inside it, and how nested that folder was? (eg 1 file of 100mb is usually quicker to delete than 100 files of 1mb)