Hello, do you want to delete the video from the camera?
You can rebuild the RAID to do that.
The operation is risky. Please create a trouble ticket.
In addition, after you delete all storage, I suggest that you can configure a recording plan on the C/S Client and specify the storage duration of recordings based on the Scheduled Videos parameter.
How to configure a video recording plan on eSpace VCN3000.
In the left-hand Others panel of the Workspace tab page, double-click Recording Plan.
Select the camera and click Next.
Set video parameters.
In pure forwarding mode, the MPU cannot store recordings. It is invalid to configure platform recording plans for cameras that connect to the MPU in pure forwarding mode.

Click Next.
Set recording plan parameters
Select Enable plan and set the plan cycle to Daily.
Drag the timeline to select a time segment for implementing video recording.
Click Next.