text: **8.4.2 Host clusters**
  
  Storwize V7000 V7.7 introduced the concept of a*host cluster*. A host cluster allows a user to 
  group individual hosts to form a cluster, which is treated as one entity instead of dealing with 
  all of the hosts individually in the cluster. 
  
  The host cluster is useful for hosts that are participating in a cluster at host operating system 
  levels. Examples are Microsoft Clustering Server, IBM PowerHA, Red Hat Cluster Suite, and 
  VMware ESX. By defining a host cluster, a user can map one or more volumes to the host 
  cluster object. 
  
  As a result, the volume or set of volumes gets mapped to each individual host object that is 
  part of the host cluster. Importantly, each of the volumes gets mapped with the same SCSI ID 
  to each host that is part of the host cluster with single command. 
  
  Although a host is part of a host cluster, volumes can still be assigned to an individual host in 
  a non-shared manner. A policy can be devised that can pre-assign a standard set of SCSI IDs 
  for volumes to be assigned to the host cluster, and another set of SCSI IDs to be used for 
  individual assignments to hosts. 