Step 3: LUN masking

The purpose of LUN masking is to control Linux® instance access to the LUNs.

About this task

Within a storage device (for example, IBM® DS8000™) it is usually possible to configure which Fibre Channel port can access a LUN, see Figure 1. You must ensure that the WWPN of the FCP channel (for NPIV setups, the WWPN of the FCP device) is allowed to access the desired LUN. Otherwise you might not be able to access the SCSI device.

LUN masking where Linux instance A has access to two disks and Linux instance B has access to three disks in a storage system. — Figure 1. LUN masking where Linux A has access to two disks and Linux B has access to three disks in a disk system

For further information on how to configure LUN masking for your setup, refer to the documentation of your storage device.