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Here is a Windows NTFS LUN (VV) that had grown to a little over 200gb used, then the data was deleted and had not been used in a while but the app owner did not want to decomission the LUN in case they needed it again. I enabled the zero_detect policy and zerod the file system with sdelete.
I had hoped to see the user used steadily go down, and illustrate the reserved size go down in a stair step like pattern, but I forgot that high res polling for capacity is set at a 1:6 ratio of the every 5 minute performance polling, so my graph was not granular enough.
The user used is 0, but the reserved is 8g. I some specific cases, I would like the ability to trim the reserved down to the bare minimum, but the only way I know how to do that is delete the empty VV and recreate it