text: Certain HBA device drivers stop when they find a gap in the sequence of SCSI LUN IDs, as 
  shown in the following examples: 
  
  (cid:2) Volume 1 is mapped to Host 1 with SCSI LUN ID 1. 
  (cid:2) Volume 2 is mapped to Host 1 with SCSI LUN ID 2. 
  (cid:2) Volume 3 is mapped to Host 1 with SCSI LUN ID 4. 
  
  When the device driver scans the HBA, it might stop after discovering volumes 1 and 2 
  because no SCSI LUN is mapped with ID 3. 
  
  **Important:**Ensure that the SCSI LUN ID allocation is contiguous. 
  
  If you are using host clusters, use the**mkvolumehostclustermap**command to map a volume to 
  a host cluster instead (see Example 7-23). 
  
  Example 7-23 The mkvolumehostclustermap command 
  
  BM_Storwize:ITSO:superuser>mkvolumehostclustermap -hostcluster vmware_cluster 
  UNCOMPRESSED_VOL 
  Volume to Host Cluster map, id [0], successfully created 