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Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 24 Configuring IP Storage
Configuring iSCSI
The failover to secondary port is done transparently by the IPS port without impacting the iSCSI session
from the host. All outstanding I/O are terminated with a check condition status when the primary port
fails. New I/O received while the failover has not completed will receive a busy status.
Tip
If you use LUN mapping, you can define a different secondary Fibre Channel LUN if the LU number is
different.
Refer to the
Cisco MDS 9000 Family Configuration Guide
for details on setting the secondary pWWN.
Enable the
revert to primary port
option to direct the IPS port to switch back to the primary port when
the primary port is up again. If this option is disabled (default) and the primary port is up again after a
switchover, the old sessions will remain with the secondary port and does not switch back to the primary
port. However, any new session will use the primary port. This is the only situation when both the
primary and secondary ports are used at the same time.
To enable the
revert to primary port
option, follow these steps:
Step 1
Choose
End Devices > iSCSI
from the Physical Attributes pane in Fabric Manager, or choose
IP >
iSCSI
from Device Manager. You see the iSCSI tables in the Fabric Manager Information pane, or the
Device Manager iSCSI dialog box.
Step 2
Click the
Targets
tab to display a list of existing iSCSI targets.
Step 3
Check the
RevertToPrimaryPort
check box to enable this option.
Step 4
Set the iSCSI target node name in the iSCSI Name field, in IQN format.
Step 5
Click the
Apply Changes
icon in
Fabric Manager (or click
Apply
in Device Manager)
to save this
change, or click
Cancel
to close the dialog box without saving any changes.
Configuring the Trespass Feature
In addition to the high availability of statically imported iSCSI targets, the trespass feature is available
(effective Release 1.3(x)) to enable the export of LUs, on an active port failure, from the active to the
passive port of a statically imported iSCSI target.
In physical Fibre Channel targets, which are configured to have LUs visible over two Fibre Channel
N-ports, when the active port fails, the passive port takes over. Some physical Fibre Channel targets
require that the
trespass
command be issued, to export the LUs from the active port to the passive port.
A statically imported iSCSI target’s secondary pWWN option and an additional option of enabling the
trespass feature is available for a physical Fibre Channel target with redundant ports. When the active
port fails, the passive port becomes active, and if the trespass feature is enabled, the MDS issues a
trespass command to the target to export the LUs on the new active port. The iSCSI session switches to
use the new active port and the exported LUs are accessed over the new active port.
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