Persistent Bindings
Persistent Bindings is the term used to indicate the mapping of
SCSI ID to FC Worldwide Name (WWN). By keeping a
persistent binding, the loop ID or port ID of a device may
change and the device will still be properly addressed.
In the Cambex AIX driver, persistent binding is automatic. At
configuration time, all devices that are found are automatically
assigned to a SCSI ID and a persistent binding is created.
Persistent bindings are by portname and are kept in the ODM
database. They are preserved and restored at reboot for all FC
devices.
To display the SCSI ID to WWN mapping for all adapters and
devices, issue the command:
/usr/lpp/cbxfc/fctest
When replacing a failed device on a SAN, we want to keep the
same SCSI ID but change the WWN binding to the
replacement. A perl script is provided for doing this:
/usr/lpp/cbxfc/FRU_replace
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