PowerMax File: If the File System Shrinks, Does the Underlying LUN on the Array Shrink?
Summary: PowerMax File creates a LUN on the array for each File System. The LUN size is expanded when a request is made to expand the File System, but it does not shrink in size if the File System shrinks. ...
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Symptoms
The File System shrinks in size.
Cause
The PowerMax array cannot shrink a LUN after it is created. The LUN can only expand in size. This is an array level limitation.
Resolution
The File System LUN does not shrink if the File System shrinks. For example, a File System is created with a size of 20 TB, a LUN is created in the array with the size of 20 TB. If the File System shrinks to 10 TB, the LUN remains at 20 TB.
Additional Information
If the File System is using some capacity, and a shrink File System request is sent that is under the percentage, the shrink request is not honored. For example, a 20 TB FS is created, and the File System is using 15 TB or 75% of capacity. Then a request is made to shrink the File System to 10 TB. The request does not go through as the request attempts to shrink the File System to a capacity that is under what is already consumed.
Affected Products
PowerMax 2500, PowerMax 8500, PowerMaxOS 10Article Properties
Article Number: 000217718
Article Type: Solution
Last Modified: 22 Sept 2023
Version: 3
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