HP StorageWorks 2/128 HP StorageWorks Fabric OS 5.X Procedures User Guide (AA- - Page 165
Table 32 Extended ISL modes: switches with Condor ASIC., Configuring an extended ISL
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Table 32 Extended ISL modes: switches with Condor ASIC. Mode L0 Buffer Allocation 1 Gbps 2 Gbps 5 (26)2 5 (26) 4 Gbps 2.5 km Distance at 1 Gbps 10 km Distance at Distance at 2 Gbps 4 Gbps 5 km 2 km Earliest Fabric Extended fabrics OS release license required? All No LE 11 16 10 km N/A 5 km 5 km 3.x, 4.x No L0.5 18 31 56 25 km 25 km 25 km 3.1.0, 4.1.0, Yes 4.x, 5.x L1 31 56 106 50 km 50 km 50 km All Yes L12 56 106 206 100 km 100 km 100 km All Yes LD1 Auto Auto Auto Auto Auto Auto 3.1.0, 4.1.0, Yes 4.4.0, 5.x (depending on the model) 1The dynamic long-distance (LD) mode configures the number of buffer credits required, based on the actual link distance. 2For each data channel (in this case, there are 4) there are 5 credits, plus 6 extra credits. For dynamic long-distance links, you can approximate the number of buffer credits using the following formula: Buffer credits = [(distance in km) * (data rate) * 1000]/2112 The data rate is 1.0625 for 1Gbps, 2.125 for 2 Gbps, and 4.25 for 4 Gbps and Fibre Channel. This formula provides the minimum number of credits allowed to a given port; the actual number will likely be higher. Configuring an extended ISL Before configuring the ISL, ensure that the following conditions are met: • Extended ISL support for HP StorageWorks 1 GB switches is limited as follows: • Extended ISLs are not supported between HP StorageWorks 1 GB switches and other HP StorageWorks models. • To support extended ISLs between HP StorageWorks 1 GB switches, the fabric.ops.mode.longDistance parameter must be set to 1 on all switches in the fabric. Each switch must be disabled before setting this parameter. • 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 Bloom-based switches) this mode needs to be enabled (set to 1) on switches running Fabric OS 3.x or 4.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. 1. Connect to the switch and log in as admin. 2. If the fabric contains a mix of switches, use the configure command to make sure the fabric-wide configuration parameter fabric.ops.mode.longDistance is set to 0 on all switches in the fabric. If the fabric contains HP StorageWorks 1-GB 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. Fabric OS 5.x administrator guide 165