I was using yast2 to remove iscsi volume and the following error appeared on the desktop:

Failure occurred during following action:
Deleting logical volume /dev/vollinea00/logvol_iscsi_01
System error code was: -4015
/sbin/lvremove –f ‘/dev/vollinea00/logvol_iscsi_01’:
Can’t remove open logical volume “logvol_iscsi_01”


What’s the meaning of “System error code was: -4015”?
Sles11SP1 and all current updates installed.