mount: /dev/mapper/STORBCK-backup already mounted or /STORBCK busy?

Error:

mount: /dev/mapper/STORBCK-backup already mounted or /STORBCK busy?

Diagnostic:

When we try to mount the /STORBCK FS we are getting above mentioned Error.

Resolution:

1. As the Other FS was became read-only, i've stop/start the iscsi service. it successfully logged into the Device.

 /etc/init.d/iscsi stop
/etc/init.d/iscsi start

2. Checked the open files for /dev/mapper/STORBCK-backup and /STORBCK , but nothing found.

3. Then checked the Major & minor Number of /dev/mapper/STORBCK-backup.

[root@exampledb /]# dmsetup ls | grep -i STORBCK
STORBCK-backup  (252, 75)

4. Then checked the open files for Major & minor Number.

[root@exampledb ~]# lsof | grep -i 252,75
screen    44131    oracle  cwd       DIR             252,75      4096            323747843 /oracle/ori4n/temp_mv_from_u00_local
bash      44134    oracle  cwd       DIR             252,75      4096            323747843 /oracle/ori4n/temp_mv_from_u00_local

5. Found Out that its been accessed by a file. Checked that file and that does not exist any more.

[root@exampledb ~]# ll /oracle/ori4n/temp_mv_from_u00_local
ls: /oracle/ori4n/temp_mv_from_u00_local: No such file or directory

6. Checked both the PID's accessing it and killed them.

[root@exampledb ~]# ps aux | grep -i 44131
oracle   44131  0.0  0.0  76848   324 ?        Ss   Apr23   0:00 SCREEN
root     45564  0.0  0.0  61240   740 pts/0    R+   13:41   0:00 grep -i 44131
[root@exampledb ~]#

[root@exampledb ~]# ps aux | grep -i 44134
oracle   44134  0.0  0.0  66264   656 pts/6    Ss+  Apr23   0:00 /bin/bash
root     46956  0.0  0.0  61240   740 pts/0    S+   13:41   0:00 grep -i 44134
[root@exampledb ~]#
[root@exampledb ~]# kill -9 44131 44134
[root@exampledb ~]#

7. Mounted the File system.

[root@exampledb ~]#
[root@exampledb ~]# mount -a
[root@exampledb ~]#
[root@exampledb ~]#
[root@exampledb ~]# df -h /STORBCK
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/STORBCK-backup
                      5.0T  1.6T  3.2T  34% /STORBCK
[root@exampledb ~]#

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