When I try and umount a partition, why do I get the following error: /partition: Device busy : Oracle FAQ

This means that someone is actively using the partition you are
trying to unmount. They might be running a program from it or they
might simply be sitting in a subdirectory of the partition.

In Solaris, you can run the command fuser to determine what processes
are using a partition:

# fuser /test
/test: 1997c 1985c

The above example shows that pids 1985 and 1997 are accessing the
/test partition. Either kill the processes or run fuser -k /test to
have fuser do this for you.

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