Cannot uninstall PowerPath on Sun Solaris host error = device is busy

pkgrm EMCpower

Cannot uninstall PowerPath on Sun Solaris host error = device is busy

pkgrm failed to inistall PowerPath on Sun Solaris 
Error Power Path Pseudos busy or mounted. Stop all I/Os and make sure all volumes are not mounted, then retry removing the package.

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* EMCpower Removal:
* Error: PowerPath pseudo(s) still in-use, busy or mounted.
* Please stop all I/Os and make sure all volumes are
* not mounted then retry removing the package.
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pkgrm: ERROR: preremove script did not complete successfully
Removal of <EMCpower> failed.

1.
Check if the pseud devices are still mounted. If so umount them and try the uninstall of PowerPath..

If still the issue there -

2.
Check with "fuser -c <pseudo device>" and 'fuser -ck <pseudo device>" and try the uninstall of PowerPath..

If still the issue there -

3.
If above 2 will not work, reboot the system to single user non cluster mode and try the uninstall of PowerPath.

If still the issue there -

4.
If still got the same "device busy error", please open the /etc/ system file and change line to "set emcp:bPxEnableInit=0" and reboot the host back in single suer mode. The value "0" will ensure in reboot PowerPath emcp modules will not be loaded (modinfo | grep -i emcp).
After the host come up try the unistall of PowerPath.

Before editing the /etc/system file please have a copy of the original file.