defrag used up more disk space running 6.10.6

[areedhimes]

i've been removing a lot of files from the nas and noticed it wasn't reclaiming memory. i stumble across a 'mantenance' blog, so peformed my first maintance on the thing.... didn't know i needed to... after reading a few blogs, i set on balancing first. when it finished, free memory moved from 2T to almost 4T. i was pretty happy with that... but following the recommedation, i defrag'd next. when it finished, free memory was 1.76. defragging a disc can't use more memory. 

i'm doing the scrub last, just to complete the cycle I was following, but can't imagine that will have an impact. bit rot is disabled.

[StephenB]

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@areedhimes wrote:

 i defrag'd next. when it finished, free memory was 1.76. defragging a disc can't use more memory. 

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If you have snapshots, then defragging can certainly reduce free space.  The way to get it back it to delete some older snapshots.  Then run another balance.

[Sandshark]

And since deleting was not adding free space, it is most likely you do have snapshots that are retaining the data you deleted.  That's their job.