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Zero = trim

Zero = trim

Posted Aug 20, 2009 10:36 UTC (Thu) by dion (guest, #2764)
In reply to: Zero = trim by ncm
Parent article: The trouble with discard

That would also help in the case where you are running on other kinds of storage that are able to optimize their resource usage based on this information.

Take virtual machines that use qcow2 files as backing, when copying such a file the zeroed blocks are simply left out of the target file.

Some SANs also avoid allocating more actual storage than needed by a block device, I'm sure those would like to get a hint about the disuse of blocks as well.

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