Unmount filesystem when device is busy

When you unmount a filesystem, you may get "device is busy error" sometimes.  Using the following steps, you can unmount safely.


# umount  /testsrv1/rman
umount: /testsrv1/rman: device is busy
umount: /testsrv1/rman: device is busy


# fuser -m /testsrv1/rman
/testsrv1/rman:         31477c


# ps -eaf | grep 31477
oracle  31477 31448  0 09:52 pts/0    00:00:00 /bin/ksh



# df -h /testsrv1/rman
Filesystem            Size  Used Avail Use% Mounted on
testsrv1:/miszpool/mis
                      2.5T  1.9T  560G  78% /testsrv1/rman


# ps -eaf | grep 31477
oracle  31477 31448  0 09:52 pts/0    00:00:00 /bin/ksh


# ps -eaf | grep 31448
dbauser1 31448 31447  0 09:51 pts/0    00:00:00 -ksh
oracle  31477 31448  0 09:52 pts/0    00:00:00 /bin/ksh


# kill -9 31477
# ps -eaf | grep 31448
dbauser1 31448 31447  0 09:51 pts/0    00:00:00 -ksh


# umount -f /testsrv1/rman


# mount /testsrv1/rman


# df -h /testsrv1/rman
Filesystem            Size  Used Avail Use% Mounted on
testsrv1:/miszpool/mis
                      2.5T  1.9T  560G  78% /testsrv1/rman