Fabric OS reference guide
201
Fabric OS 3.x Document Addendum
Limitations
Because the total number of frame buffers is limited in a quad, if one of the ports in the quad is
configured and enabled as an L2 long-distance port, all remaining ports are disabled due to the
lack of sufficient buffer credits. Similarly, you also can configure an L1 long-distance port in
combination with other port types provided there are sufficient buffer credits for the remaining
ports in the quad. As an example, here are two valid port configurations: two L1 long-distance
ports at 2 Gbit/sec speed, or four LE or three L0.5 long-distance ports at 2 Gbit/sec.
A quad is defined as a group of four adjacent ports that share a common pool of frame buffers.
Ports 0 through 3 belong to a quad, as do ports 4 through 7, and so forth.
If the long-distance links are between StorageWorks 1 GB switches, in order to have a
long-distance port take effect, all switches in the fabric must be configured to run the
long-distance fabric mode (for instance, the long-distance fabric mode bit must be set to be 1).
Otherwise, the fabric segments. In fact, you cannot configure a long-distance port in a switch
unless the long-distance fabric mode is on for that switch.
For the same reason, when all ports are reconfigured to non-long-distance ports, you must
reconfigure the long distance fabric mode for that switch.
This restriction does not apply to fabrics with long-distance links between StorageWorks 2 GB
switches.
Configurations with long-distance links between 2000- and 3000-series switches are not
supported.
Example
To configure switch port 3 to support a 100 km link:
To configure the port for long distance, to support a 50 km link with enhanced link reset
protocol:
See Also
configure
portcfgshow
portshow
switchshow
VC_translation_link_init
See the “
Description
” on page 199 section for the
meaning of this value. The default value is
1
when
not specified with the long-distance setting.
Therefore, the command
portcfglongdistance port_number
implies
portcfglongdistance
port_number, LD, 1.
switch:admin>
portCfgLongDistance 3, "L2"
Committing configuration...done.
switch:admin>
portCfgLongDistance 3, "L1", 1
Committing configuration...done.
Summary of Contents for StorageWorks 2/16 - SAN Switch
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