Wwn Syntax - Oracle SPARC Administration Manual

WWN Syntax

When you use Oracle Solaris 10 Jumpstart, you must refer to drives with a specific syntax.
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The letters in the WWN portion of the drive name must be capitalized, while the c, t, and d
initial characters are lower case (for example, c0t5000C50033438DBBd0).
When you run the Oracle Solaris format command, you must select one of the logical
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device names presented in the output. To ensure that you select the correct drive for an
operation, you must correlate these logical device names with the physical drives.
When you see a system message that lists a drive's logical device name, you might need to
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identify the physical slot in which the drive is installed.
Related Information
"WWN Syntax" on page 70
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"WWN Syntax in an Oracle Solaris 10 Installation on an Individual Drive" on page 78
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"WWN Syntax in an Oracle Solaris 10 Installation on a RAID Volume" on page 79
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WWN Syntax
Oracle Solaris uses the WWN (World Wide Name) syntax in place of the locally unique tn
(target ID) field in logical device names. This change affects how device names can be mapped
to specific SCSI devices. The following points are key to understanding the impact of this
change:
Before the change to WWN nomenclature, Oracle Solaris identified the default boot device
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as c0t0d0.
With the change, the device identifier for the default boot device is now referred to as
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c0tWWNd0, where WWN is a hexadecimal value that is unique to this device throughout the
world.
This WWN value is assigned by the manufacturer of the device and, therefore, has a random
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relationship to the server's device tree structure.
Because WWN values do not conform to the traditional logical device name structure, you
cannot directly identify a target device from its cntWWNdn value. Instead, you can use one of
the following alternative methods to map WWN-based device names to physical devices.
When the OS is not running, you can analyze the output of the OpenBoot command probe-
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scsi-all.
For example, you would analyze probe-scsi-all output when you want to identify a boot
device.
70 SPARC and Netra SPARC T5 Series Servers Administration Guide • August 2016