The wwn placeholder represents the World Wide Name (WWN) of a device. A WWN is a 64-bit address used to uniquely identify a device in a Fibre Channel network. A WWN is typically assigned to a device by the device manufacturer, although the WWN can be later changed by a network user.
Oracle Secure Backup supports devices whose operating system-assigned logical names can vary at each operating system restart. Fibre Channel-attached tape drives and libraries connected to NAS devices fall into this category. You can refer to these devices by their WWNs, for example, nr.WWN[2:000:0090a5:0003f7].a
, rather than their logical names, for example, nrst0a
. Unlike the logical name, the WWN does not change when you restart.
Any substring of the attachment's raw device name that is the string $WWN
is replaced with the value of wwn each time the device is opened. For example, a usable raw device name for a SAN-attached Network Appliance filer is nr.$WWN.a
. This name specifies a no-rewind, best-compression device having the world-wide name you specify with the --wwn/-W
option, for example, --wwn WWN[2:000:0090a5:0003f7]
.
wwn
Specifies a World Wide Name.