On a SUSE Linux Enterprise Server host connected to a storage controller, the presence of dummy LUNs causes issues during a SCSI rescan. This issue is not yet resolved in SUSE Linux Enterprise Server 9 and SUSE Linux Enterprise Server 10.
Dummy LUNs are those that show up as "UNKNOWN" in /proc/scsi/scsi/ even when no LUNs are mapped to the host. These LUNs have a generic device node (/dev/sg* entry), but no corresponding disk node (/dev/sd* entry). Due to these dummy LUNs, subsequent SCSI rescans on the host fail to recognize newly added LUNs, unless preceded by a write to the sysfs delete attribute of the dummy LUN.
