Drobo FS Time Machine Trouble


Drobo FS, with Dashboard 3.41, Firmware 1.27

Time Machine says I need to start a new back up, which fails when looking for the backup disk. Dashboard is running and all is looking fine there.

I get the following message

Time Machine completed a verification of your backups on “Drobo-FS.local”. To improve reliability, Time Machine must create a new backup for you.

I select Start New Backup, and that fails because Time Machine cannot delete the sparsebundle file.

How to fix this?