HP StorageWorks Fabric OS 5.3.x administrator guide (5697-0244, November 2009)

Fabric OS 5.3.0 administrator guide 359
4/256 SAN Director (FR4-18i blades)
For the FR4-18i blade, long distance settings are applicable only to the physical FC_Ports (ports 0-15). Long
distance settings are not applicable to virtual FC_Ports (ports 16-31). Table 90 lists the number of ports that
can be configured at various distances.
Configuring an extended ISL
Before configuring an extended ISL, ensure that the following conditions are met.
• Extended ISL support for 1Gb switches is limited as follows:
• To support extended ISLs, the fabric.ops.mode.longDistance parameter must be set to 1 on
all 1Gb switches switches in the fabric. Each switch must be disabled before setting this parameter.
• Extended ISLs are not supported between 1Gb switches and other Brocade models.
• For fabrics that contain a mix of HP StorageWorks models, the fabric.ops.mode.longDistance
parameter must be set to 0 (the default). Under certain circumstances (for example, if you want
extended distance between 3xxx switches) this mode must be enabled (set to 1) on switches running
Fabric OS v3.x or v4.x. Talk to your switch provider for details.
• The ports on both ends of the ISL must have the same configuration.
• Use only qualified SFPs.
To configure an extended ISL
1. Connect to the switch and log in as admin.
2. If the fabric contains 1Gb switches with extended ISLs, use the switchDisable command to disable
the switch and then use the configure command to set the fabric-wide configuration parameter
fabric.ops.mode.longDistance to 1 on all switches in the fabric.
3. Enter the portCfgLongDistance command, using the following syntax:
portcfglongdistance [slotnumber/]portnumber [distance_level] [vc_translation_link_init]
[desired_distance]
Table 90 4/256 SAN Director (FR4-18i blades)
Speed
(Gbps)
Number of ports allowed at distance (km)
10 km 25 km 50 km 100 km 250 km 500 km
1 16 ports 16 ports 16 ports 16 ports 6 ports 2 ports
2 16 ports 16 ports 16 ports 8 ports 2 ports n/a
4 16 ports 16 ports 8 ports 4 ports n/a n/a