Note:  The volume  RHEL_VOLUME  is mapped to both of the hosts by using the same SCSI  ID. Typically, that is the requirement for most host-based clustering software, such as  Microsoft Clustering Service (MSCS), IBM PowerHA, and VMware ESX clustering. To unmap a volume from the host, the  rmvdiskhostmap  command is used, as shown in  Example 8-25. Important:  Before unmapping a volume from a host on Storwize V7000, ensure that the  host side action is completed on that volume by using the respective host operating system  platform commands, such as unmounting the file system, or removing the volume or  volume group. Otherwise, it can result in data corruption. To rename a host definition, issue the  chhost -name  command, as shown in Example 8-26. In  this example, the host  RHEL_HOST  is renamed to  FC_RHEL_HOST . To remove a host from the Storwize V7000, the  rmhost  command is used, as shown in  Example 8-27. Note:  Before removing a host from Storwize V7000, ensure that all of the volumes are  unmapped from that host, as shown in Example 8-25. Chapter 8. Hosts  377 Example 8-27 Removing a host IBM_Storwize:ITSO-V7000:superuser> rmhost RHEL-Host-07 IBM_Storwize:ITSO-V7000:superuser> IBM_Storwize:ITSO-V7000:superuser> chhost -name RHEL-Host-07 RHEL-Host-06 IBM_Storwize:ITSO-V7000:superuser> IBM_Storwize:ITSO-V7000:superuser> rmvdiskhostmap -host RHEL-Host-06 Linux1 IBM_Storwize:ITSO-V7000:superuser> IBM_Storwize:ITSO-V7000:superuser> lsvdiskhostmap Linux1 id name SCSI_id host_id host_name vdisk_UID IO_group_id IO_group_name mapping_type host_cluster_id host_cluster_name  protocol  11 Linux1 0 3 RHEL-Host-05 60050768019C8514440000000000003C 0 io_grp0 private scsi 11 Linux1 0 4 RHEL-Host-06 60050768019C8514440000000000003C 0 io_grp0 private scsi IBM_Storwize:ITSO-V7000:superuser> Example 8-24 Ensuring the same volume is mapped to multiple hosts Example 8-25 Unmapping a volume from a host Example 8-26 Renaming a host Removing a host Renaming a host Unmapping a volume from a host 2. The volume  RHEL_VOLUME  is mapped to two hosts ( RHEL_HOST  and  iSCSI_RHEL_HOST ), and  can be seen by issuing the  lsvdiskhostmap  command, as shown in Example 8-24.