Where is space go in DPM Storage Pool - Resolution with screenshots

Where is space go in DPM Storage Pool - Resolution with screenshots

We are running DPM 2012. We use all 8TB spaces of two disks. We add another Drobo SAN with 16TB spaces and total are 24TB. However, when I try to add more data to backup, it shows I don't have enough spaces.

The Disk Management is 100% free.

The Storage pool details shows only 53GB disk space remaining.

In DPM Disk Management, it shows none on Protected data source. Where do the spaces go or how can I get them back?

Troubleshooting: The disk has been formatted as Windows drive. You have to remove that volume to have a blank disk. DPM can only utilize blank disks. These articles may help.

How to create an iSCSI disk for DPM Storage Pool - Step by step with screenshots If the disk is larger than 2TB, select GPT.

How to create volume for DPM on Drobo B1200i - Step by step with screenshots Highlight the Drobo b1200i you want to cerate a volume.

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