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#### Disk Zones for SPARC T3-1 Servers With Sixteen-Disk Backplanes

Whenever a SPARC T3-1 sixteen-disk backplane is managed by the onboard SAS-2 controllers, the backplane must be partitioned into two logical zones, with eight disk slots per zone:

- Zone A -- Contains backplane slots 0 through 7, which are visible only to onboard SAS-2 controller 0.

- Zone B -- Contains backplane slots 8 through 15, which are visible only to onboard SAS-2 controller 1.

Disk zoning requires that the LSI expander firmware on the backplane include patch 147034-01 (at least). This patch creates the required disk zones.

Note - For additional information about patch 147034-01, refer to its README document, README.147034 on the My Oracle Support site.

Tip - When zoning is enabled, `devalias` for slots 8-15 will be incorrect unless the system firmware is updated to either 8.0.5.b (or a higher 8.0 level) or to 8.1.0 (or higher). For more information see Minimum System Firmware for Valid `devalias` in Upper Disk Locations for more information.

These disk zone definitions are persistent. Their configuration cannot be modified and they remain in effect across power cycles and reboot operations. They must be active whenever the SAS-2 onboard controllers are used to manage disks in a sixteen-disk capable backplane.

However, if you use an internal PCIe RAID HBA instead of the onboard SAS-2 controllers, you must disable disk zoning. You do this with the following command:

    # zoningcli disable zoning

The `zoningcli` command is contained in versions 2.1.1 and 2.2 of the Oracle Hardware Management Pack. See Hardware Management Pack Overview for more information.

Most SPARC T3-1 servers with sixteen-disk capable backplanes are shipped with zoning enabled. There are two exceptions to this default rule:

- Zoning is disabled at the factory when a SPARC T3-1 system containing a sixteen-disk backplane is built with an internal PCIe RAID HBA.

- SPARC T3-1 systems manufactured with 16-disk backplanes before disk zoning became the default were shipped without patch 147034-01. For these systems, the patch must be installed in the field to support disk zoning.

Note - Because disks are not visible to controllers across zone boundaries, a SAS-2 controller cannot create a RAID volume that contains disks that are included in the other zone.

You can use the `zoningcli` utility to enable or disable zoning in a sixteen-disk capable backplane. See Enabling and Disabling Disk Zoning In the Field for more information.

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