When your LUNs are thinly provisioned and over-committed, you can use several strategies to prevent your LUNs from going offline.
You can use the following strategies to prevent your LUNs from going offline:
- Follow the volume options best practices for thin provisioning. When you follow the best practices, you automate the volume to grow or delete Snapshot copies as needed.
- Monitor the available space on your volumes and aggregates. You can monitor your SAN environment manually with System Manager or you can monitor your entire SAN environment automatically.
- Use space reclamation when possible. If a LUN contains deleted blocks, you can use space reclamation to put those blocks back into the general pool of storage.
- Understand the rate of change of your data. How much your data changes over time helps you determine what type of LUN would be most beneficial for your environment.
- Enable the LUN -e space_alloc option. Whn you enable space_alloc, Data ONTAP notifies the host when the volume containing the LUN is running out of space and cannot grow.