Setting Tiering Parameters

Context

When a file is being written, if the specified storage medium is full, it will be written to other storage medium. That is, if the disk pool of the target tier grade has no remaining space, the system checks whether a disk pool of another tier grade has remaining space in the sequence of hot, warm, to cold, warm, cold, to hot, or cold, hot, to warm. If yes, the system writes data to the disk pool. If no, the system returns an error. For example, a file needs to be written to a warm disk pool based on its placement policy but the disk pool has no remaining space. The system then checks whether a cold disk pool has remaining space. If yes, the system writes data to the cold disk pool. If no, the system checks whether a hot disk pool has remaining space. If yes, the system writes data to the hot disk pool. If no, an error is returned.

Procedure

1. Choose Resources > Dataflow > SmartTier.
2. Click Set Parameter.

   The Set Parameter page is displayed.

   

   Tiering parameters are global parameters. That is, such parameter values take effect for all namespaces and are not related to accounts.

3. Set Default Placement Policy Tier Grade. If a written file does not meet any placement policy, it will be stored to the disk pool at the specified default tier grade.
4. Click OK.