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## Mapping a volume by using the CLI 

A useful way for administrators to perform this task might be to use the CLI. Volumes can be mapped by using the svctask mkvdiskhostmap  command. 

How to map a volume to a host by using the CLI is shown in Example 7-4. 

IBM_Flashsystem:FlashSystem_900:superuser>svctask mkvdiskhostmap -force -host 0 4 Virtual Disk to Host map, id [4], successfully created IBM_Flashsystem:FlashSystem_900:superuser>lsvdiskhostmap 4 id name SCSI_id host_id host_name vdisk_UID IO_group_id IO_group_name 4 SVC_5 4 0 SVC 0020c24004000000 0 io_grp0 IBM_Flashsystem:FlashSystem_900:superuser> 

In the CLI process for mapping volumes, this example uses the logical number for the host and the logical number for the volume. These logical numbers can be discovered by using the following commands: 

GLYPH<SM590000> lshost : Shows defined hosts and their status 

GLYPH<SM590000> lsvdisk : Shows defined volumes and their preferences 

## Unmapping volumes 

When you remove a volume mapping, you are not deleting the volume. Instead, you are removing the connection from the host to the volume. If you mistakenly map a volume to a host or if you want to reassign the volume to another host, click Volumes →  Volumes by Host . Highlight the volume or a group of volumes that you want to unmap, right-click, and click Unmap from Host , as shown in Figure 7-91. 

<img src='content_image/980373.jpg'>

The Unmap Volumes from Host window opens, which indicates that the selected volumes are to be unmapped (see Figure 7-92 on page 238). Click Yes  to confirm that volume unmaps from the specified host. 

