Hello Jinhu, such a question is not for the "NAS community" - you should really open a case with the GSC to ask for assistance to help guide you thru whatever is occurring. I see you have an "active" in SalesForce, so this is the best way to proceed.
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Albert Hagopian
Hitachi Vantara
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Original Message:
Sent: 07-05-2025 01:56
From: Jinhu Song
Subject: The SD has grown from X bytes to Y bytes since span COD was written. The extra space will be wasted.
Is there a command that you can shrink LUN without destroying the data on it?
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Jinhu Song
HDSFC1066
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Original Message:
Sent: 07-03-2025 08:28
From: Albert Hagopian
Subject: The SD has grown from X bytes to Y bytes since span COD was written. The extra space will be wasted.
Apologies, for some reason I lost access to this forum and hopefully am now back to receiving mails.
When a DPVol is presented to the VSP One File 30, the server inventories the SD and knows the capacity of the DPVol. As part of this, a signature is written to each DPVol (this is CoD) and thus "expansion" of a DPVol is not a supported task.
It appears someone "thought" that they could perform a LUN expansion and the server would allow the extra space. Unfortunately, that is not the case. and the LUN needs to be shrunk back to the exact block size pre-expansion.
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Albert Hagopian
Hitachi Vantara