Using HP Serviceguard for Linux with VMware virtual machines - Technical white paper

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Now you can start adding the device by clicking the Add button above the hardware listing, as shown in figure 2.
In the next screen, select Hard Disk, as shown in figure 3.
Click the Raw Device Mappings radio button in the next screen, as shown in figure 4. If the RDM option is disabled, it
indicates that there is no free LUN available for mapping. If the LUNs are exposed to the ESX server and if it is found that
no LUNs are available for mapping, you may need to reboot the ESX server. Make sure that all VMs are powered down
when the ESX server is rebooted.
Figure 2. Select Add
Figure 3. Select hard disk