Don't understand df/du output

[Alain AUDEBERT aka 2A]

>> I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
>> Is it the 8% reserved by FFS ?
> Yes


Maybe it's important, but it's not an hard disk, just a Xen volume !
So maybe we can't tunefs it ?

Regards,
Alain

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