df shows space not in use.. but the space isn't available?

This morning MySQL wasn't working so I checked the diskspace with 'df' and it was 100%. I freed up about 2 GB of space, but df says that it's still not availabe, even though it's not in use. Anyone know what the problem could be? Here's the df printout:

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 29G 27G 0 100% /
/dev/hdb1 104M 13M 86M 13% /boot
none 527M 0 527M 0% /dev/shm

 

 

 

 

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