hpacucli – Error: Another instance of ACU is already running (possibly a service)

If you receive this error message

root@linux:~ # /usr/sbin/hpacucli
HP Array Configuration Utility CLI 8.70-8.0
Detecting Controllers…

Error: Another instance of ACU is already running (possibly a service). Please
terminate the ACU application before running the ACU CLI. Press ENTER to
exit.

But there is no process running

root@linux:~ # ps -ef | grep -i acu
root 4805 32086 0 10:00 pts/0 00:00:00 grep -i acu

Delete all files on /opt/compaq/cpqacuxe/bld/locks to solve this problem

root@linux:/opt/compaq/cpqacuxe/bld/locks # ls
. .. CPQACU_MUTEX

In another occasion, solved this problem by deleting file /dev/shm/sem.hpacu.appLock on a RHEL 5

root@linux:~ # ls -l /dev/shm/sem.hpacu.appLock
-rw-r–r– 1 root root 32 Aug 16 05:21 /dev/shm/sem.hpacu.appLock

root@linux:~ # rm /dev/shm/sem.hpacu.appLock
rm: remove regular file `/dev/shm/sem.hpacu.appLock’? y

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