shrinking kernel reserve space

CJ Tres ctres at
Thu Mar 15 14:32:29 UTC 2012

I've got a 3 TB drive dedicated to backup a data partition and therefore 
I don't need the 5% reserved for the kernel.
I found a command several days ago to shrink that space to a certain 
percentage but cannot remember what it was and evidently can't figure 
what the appropriate search term is to find it again.

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