Setting a Default Tiering Policy

Procedure

1. Choose Services > File Service > Tiering.
2. Click Set Parameter.

   The Set Parameter page is displayed.

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. Determine whether to enable Spillover.
   • Enabled: when a file is being written, if the specified storage medium is full, it will be written to other storage medium.
   • Disabled: When a file is being written, if the specified storage medium is full, an error is returned.
   

   After Spillover is enabled, if the disk pool of the target tier grade has no remaining space, the system queries the remaining space of other disk pools in the sequence of tier grades from hot, warm, to cold, warm, cold, to hot, or cold, hot, to warm. If a disk pool is available, data is then written to the disk pool. If no disk pool is available, an error message is returned. 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. If Spillover is enabled, the system first queries the remaining space of a cold disk pool. If the cold disk pool is available, data is then written to the disk pool. Otherwise, the system queries the remaining space of a hot disk pool. If the hot disk pool is available, the file is written to the disk pool. Otherwise, an error message is returned.

5. Click OK.