Expand and shrink a GPFS file system

You can resize a GPFS file system when its capacity is insufficient or larger than needed. Set a target capacity above the current capacity to expand the file system, or below it to shrink the file system.

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When to resize

• Expansion is suitable when file system capacity is insufficient or when training, inference, or data processing tasks are expected to write more data. GPFS file systems use thick provisioning. After expansion is complete, resources are metered based on the adjusted capacity.
• Shrinking is suitable when the file system capacity is larger than needed and the current data volume is significantly lower than the target capacity. Before shrinking the file system, check its current usage. We recommend deleting or migrating data that is no longer needed and leaving sufficient spare capacity. If usage is too close to the target capacity, shrinking may fail or subsequent writes may be affected.

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Prerequisites

Before adjusting the capacity, confirm the following:

• The file system status is Running.
• The target capacity is within the capacity range and adjustment increment for the current specification.
• The impact of the capacity adjustment on running tasks has been assessed.
• If you need to shrink the file system, current usage is lower than the target capacity, with sufficient spare capacity reserved.

If current file system usage exceeds the target capacity, shrinking will fail.

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Procedure

1. Log in to the GPU Cloud console.
2. Go to GPFS > File System.
3. Locate the file system whose size you want to adjust, and click Manage.
4. In the pop-up panel, click Adjust Capacity under Capacity.
5. Choose whether to increase or decrease the capacity, then enter the target capacity.

   Parameter	Description
   Action Type	Choose to expand if the target capacity is greater than the current capacity, or shrink if it is less.
   Capacity	The target capacity of the file system after adjustment. The target capacity must fall within the capacity range and adjustment increment of the current specification.

6. Confirm the amount, then click Confirm.
7. Return to the file system list page and verify the adjustment result based on the status.
   • Extending: The file system capacity is being adjusted. This status may be displayed when expanding or shrinking the file system.
   • Running: Capacity adjustment is complete.
   • Failed: Capacity adjustment failed. Check the error message. If you cannot determine the cause, contact technical support.
   Capacity adjustment is an asynchronous operation. Expanding or shrinking a file system typically takes 2–10 minutes. Larger capacity adjustments may take longer.