Should I Have 2 Volumes?

I recently replaced a 1tb drive with a an 8tb drive in my Drobo DDR3-A (gen 3?) All seemed well until my cloud back-up (Backblaze) told me it could not back up my Drobo. I noticed I now have two volumes in my Drobo dashboard. In addition, on restarting Mac (OS 10.14) I see two Drobos mounted on my desktop. Do I need just one volume and how do I do it? Any help would be appreciated. Thank you. Jim

Would simply renaming one of the volumes be sufficient? I also use Backblaze, and I don’t have any problems backing up three volumes on my Drobo 8D (the fourth volume is a backup volume for TimeMachine).