For a long time I loved my drobo. Then I upgraded to Mavericks and all went to shit. On reboot I would have to carefully unmount the now read only drobo, and remount, a process that took around 30 minutes. Only then would it be properly mounted.
I recently discovered HFS journaling wasn’t enabled on the drive. Turning that on in disk utility (a big button in the toolbar) fixed the reboot woes.
Putting this blog post here in the hopes I will help others with the same problem.
Edit: This didn’t in the long term solve the problem. Ultimately it was using the OS low level fsck/diskutil commands that solved it. Using “fsck_hfs -Race” was the main solution. Do a “man fsck_hfs” to check how to run this command.