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Why is my storage pool full when there is still free space in my thick volume?

Last modified date: 2025-07-01

Applicable Products

  • QTS
  • Storage & Snapshots

Root Cause

When a thick volume is created, the storage pool pre-allocates space to the thick volume, which means the thick volume's total capacity is no longer available to the storage pool for other usage.

If you set the thick volume to maximum capacity during creation, that means all available space in the storage pool is pre-allocated to the thick volume. As a result, regardless of how much free space is in the thick volume, the allocated capacity in the storage pool will always be 100%.

Note

The system sends alert notifications whenever the allocated capacity in the pool exceeds the alert threshold. To adjust or disable the alert threshold, go to Storage & Snapshots > Storage > Storage/Snapshots, select the pool and click Manage, and then click Action > Set Threshold.

Solutions

To free up space in the storage pool, you can either resize the thick volume or convert it to a thin volume. 

Converting a thick volume to a thin volume releases free space in the thick volume back into the storage pool. However, once you convert a thick volume to a thin volume, you cannot convert it back to a thick volume.

Resizing a thick volume
Note
If your pool is already full, you may not be able to shrink the volume due to a limitation in QTS 5.0.1 and later. If this is the case, you can use the second option below to convert your thick volume to a thin volume.
  1. Go to Storage & Snapshot > Storage > Storage/Snapshots.
  2. Select the thick volume.
  3. Click Manage.
    The volume management window opens.
  4. Click Action and then select Resize Volume.
    The Resize Volume Wizard opens.
  5. Specify a capacity lower than the current capacity but greater than the used capacity.
  6. Click Apply.
    The system resizes the thick volume.
Converting a thick volume to a thin volume
  1. Go to Storage & Snapshot > Storage > Storage/Snapshots.
  2. Select the thick volume.
  3. Click Manage.
    The volume management window opens.
  4. Click Action, and then select Convert to Thin Volume.
    The Convert to Thin Volume window opens.
  5. Review the information.
    Note
    Once you convert a thick volume to a thin volume, you cannot convert it back to a thick volume. 
  6. Click Apply.
    The system converts the thick volume to a thin volume and releases free space in the thick volume back into the parent storage pool.

Further Reading

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