How to fix Drive Critical

Hi there,
there are 6 partition on my server and the other drive still have plenty of space but this drive >>> /hda6 (/usr) is 100% full, that is not allow me to create anymore account. is anyone know how to fix this issue ?
this is a msg from my server email to me:

Drive Critical: /hda6 (/usr) is 100% full


please help

 

 

 

 

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