Here’s a clear explanation of the relationship between physical disks, cell disks, and grid disks in Oracle Exadata:
🔁 Relationship Overview
PhysicalDisk → CellDisk → GridDisk
Think of it as a layered storage abstraction:
| Layer | Description |
|---|---|
| PhysicalDisk | The actual hardware disk (HDD or Flash) inside the Exadata storage server |
| CellDisk | A partition of the PhysicalDisk created and managed by Exadata software |
| GridDisk | A further logical slice of a CellDisk, exposed to ASM as usable storage |