IBM Midrange System DS4000 Series Hardware Manual page 236

2. In the Define Additional Mapping window, select the logical drive you want to map to this
host group or host and assign the correct LUN number, as shown in Figure 4-85.
Figure 4-85 Define Additional Mapping
Note: If you change an existing mapping of a logical drive, the change is effective
immediately. Therefore, make sure that this logical drive is not in use or even assigned
by any of the machines attached to the storage system.
3. To make the logical drives available to the host systems without rebooting, the Storage
Manager Utilities package provides the hot_add command-line tool (for some operating
systems). You simply run hot_add, all host bus adapters are rescanned for new devices,
and the devices are assigned within the operating system.
– You might have to take appropriate steps to enable the use of the storage inside the
operating system, such as formatting the disks with a file system and mounting them.
– If you attached a Linux system to the DS5000 storage subsystem, you need to remove
the mapping of the access logical drive. Highlight the host or host group containing the
Linux system in the Mappings View. In the right part of the window, you see the list of
all logical drives mapped to this host or host group. To remove the mapping of the
access logical drive, right-click it and choose Remove Mapping. The mapping of the
access logical drive is removed immediately.
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IBM Midrange System Storage Hardware Guide