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Unable to Umount /u01 on Exadata X5 machine (Oracle BP6) (Doc ID 2001832.1)

Last updated on FEBRUARY 03, 2019

Applies to:

Linux OS - Version Oracle Linux 6.6 with Unbreakable Enterprise Kernel [2.6.39] and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64


The customer is unable to umount the /u01 directory.

This can be seen via the following steps:
 1. Stop the application using /u01:

# cd /opt/oracle.ExaWatcher; ./ --stop
# /u01/app/ stop crs
# /u01/app/ stop

2. Attempt to umount the file system, but it fails with the error below:

# umount /u01
umount: /u01: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

The following are also observed:

1. No output when running lsof:

# lsof +D /u01

2. No output when running fuser:

# fuser -mv /u01
# fuser -mv /dev/mapper/VGExaDb-LVDbOra1

3. No loop devices:

# losetup -a

4. No NFS exports:

# exportfs -v



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