Chapter 11. External storage virtualization 551
Figure 11-3 shows an example of how to cable devices to the SAN. Refer to this example as
we describe the zoning.
Figure 11-3 SAN cabling and zoning example diagram
Create an IBM Storwize V5000/external storage zone for each storage system to be
virtualized, as shown in the following examples:
򐂰 Zone DS5100 controller ports A1 and B1 with all node ports 1 and 3 in the RED fabric
򐂰 Zone DS5100 controller ports A2 and B2 with all node ports 2 and 4 in the BLUE fabric
11.1.3 External storage configuration planning
External storage systems provide redundancy through various RAID levels, which prevents a
single physical disk failure from causing an MDisk, storage pool, or associated host volume
from going offline. To minimize the risk of data loss, virtualize storage systems only where
logical unit numbers (LUNs) are configured by using a RAID level other than RAID 0 (for
example RAID 1, RAID 10, RAID 0+1, RAID 5, or RAID 6).
Verify that the storage controllers to be virtualized by IBM Storwize V5000 meet the
requirements. The configuration restrictions can be found on the Support home page, which
is available at this website:
http://www-947.ibm.com/support/entry/portal/Overview
Make sure that the firmware or microcode levels of the storage controllers to be virtualized
are supported by IBM Storwize V5000.

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