Checkmk Werk 10747: ibm_svc_mdisk: don't crash on discovery

ID: 10747 Title: ibm_svc_mdisk: don't crash on discovery Component: Checks & agents Level: 1 Class: Bug fix Version: 1.7.0i1 On devices that do not support the lsmdisk command the check plugin ibm_svc_mdisk failed so that the "Check_MK Discovery" service showed the error "UNKN - check failed - please submit a crash report!". This is fixed.