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REMINDER: Volumes can only be detached if:

1. they are not in active use by a process on the instance
   

1. Try:
   1. fuser -

1. 1. m /

1. 1. <volume>  to LIST all processes using a volume
   2. fuser -km /<volume>

1. 1.  to KILL all processes using a volume

2. the instance to which they are attached is active

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sudo lsof /vol_dir will also show you processes using the volume.