User`s guide

170 XgOS User’s Guide • September 2014
In this figure, the Oracle Fabric Interconnect controls which LUNs can be seen by the
vHBAs. To accomplish this, the Oracle Fabric Interconnect deploys different vHBA
policies (vHBA-A, vHBA-B) to maintain LUN security. When a vHBA is created, a
different LUN mask is assigned.
RSCN does not report LUN state changes. Whenever the LUN masking changes on
an existing vHBA, you must also issue a rescan on the Oracle Fabric Interconnect
to send an RSCN update. See “Parameter Description” on page 171 for details.
When LUN masking is enabled, the SCSI “report luns” command will be intercepted
and processed by the vHBA host software and Oracle Fabric Interconnect. For more
details, see “Optional LUN Masking: No Report LUN Interception” on page 174.
If a storage controller fails to register its new LUN settings with the fibre channel
fabric name server, you might have to trigger an RSCN in addition to the rescan on
the Oracle Fabric Interconnect.
Note – Windows-based servers attempt to write volume labels to all available
LUNs. This action can render the LUNs unusable by other operating systems and
can result in data loss.