Specifications

7-2
Cisco SN 5428-2 Storage Router Software Configuration Guide
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Chapter 7 Configuring Transparent SCSI Routing
Summary of Configuration Process
• Dynamic mode
When transparent SCSI routing is deployed in dynamic mode, the iSCSI client-to-internal FC
WWPN mappings are not persistent across reboots; they are reset each time any of the following
occurs:
– Whenever the storage router is rebooted
– Whenever an IP host (iSCSI client) logs in and out, then logs back in
For both static mode and dynamic mode, the maximum number of FC WWPNs available on the storage
router is 62; a maximum of 62 iSCSI clients can be logged in at any one time. As each new iSCSI client
connects and logs in to the storage router, it is assigned (mapped) to the next available internal FC
WWPN. After the maximum number of iSCSI clients have logged in, each additional iSCSI client
connection will be rejected until one of the following occurs, depending on whether the storage router
is deployed in dynamic or static mode:
• In dynamic mode, each additional iSCSI connect is rejected until an iSCSI client logs out, making
an FC WWPN available.
• In static mode, each additional iSCSI connect is rejected until a binding is manually cleared to make
an FC WWPN available. Bindings can be manually cleared only in static mode. To view all saved
mappings, use the show static iscsibindings CLI command. To see which mappings are currently
being used, issue the show interface fci1 iscsibindings and show interface fci2 iscsibindings
commands. To clear bindings that are not being used, issue the clear static iscsibinding command.
Note To deploy dynamic mode with transparent SCSI routing, the intelligent storage array connected to the
SN 5428-2 must support an FC extended port login, which contains the IP Host (iSCSI initiator name)
and the associated IP address embedded in the FC login frame. The iSCSI FC PLOGI frame is not used.
The final parameter needed to create an instance of SCSI routing in an SN 5428-2 deployed for
transparent SCSI routing is at least one IP address assigned to a Gigabit Ethernet interface. IP hosts
access FC storage using this address.
The initial configuration script allows you to associate each Gigabit Ethernet interface with a unique IP
address, or specify a single IP address that can be presented on either interface. If you configure a single
IP address that can be presented on either interface, both Gigabit Ethernet interfaces must be connected
to the same network segment.
Once all requested values have been entered and the script completes, a single SCSI routing instance
named, transparent, is automatically created. The SN 5428-2 then initiates the target discovery process
and creates an iSCSI logical target for each Fibre Channel target discovered.
Afterwards, the SN 5428-2 will discover new targets whenever any of the following occurs:
• A new target or Fibre Channel switch or hub is added to the SN 5428-2.
• cable is plugged in causing a loop initialization primitive LIP.
• The SN 5428-2 is rebooted.