10
Dynamic Target LUN Discovery and LUN Mapping
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| The server UltraNet Edge 3000 may also be statically configured for a |
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| specific UltraNet Edge 3000 target LUN to be bound to a designated |
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| remote target WWN. |
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| Dynamic Target LUN Discovery and LUN Mapping | ||
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| The following sections provide an overview of target and LUN |
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| discovery and both dynamic and static mapping. |
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| Overview |
| When an Edge Fibre Channel interface is configured for FCP, it may |
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| be configured as an Edge target, an Edge initiator or both. The Edge |
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| initiator actively connects to device targets. The Edge target passively |
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| connects to host initiators. |
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| The Edge target and Edge initiator maintain arrays of I_T_L |
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| connections based upon SCSI IDs. In implementing FCP, the port ID |
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| or alpa is used in place of the SCSI ID to maintain the SCSI ULP |
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| functionality. |
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| To host initiators, the Edge target appears as a single target with |
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| multiple LUNs. When LUN 0 is configured in Emulate mode, it will |
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| appear as a device type controller. When LUN 0 is configured in |
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| Passthru mode, it will represent an actual remote device. In either |
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| case, the Report LUNs command will be handled locally in the Edge |
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| attached to the host and the response will indicate all available host |
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| LUNs. |
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| The Report LUNs command is handled by the Edge target and |
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| reflects the number of configured LUNs (SCSItoSCSIdataPath). The |
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| response to a Report LUNs command merely indicates the number of |
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| LUNs available. This information is forwarded to the host regardless |
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| of the number or the state of remote targets. |
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| The number of LUNs configured will be 8 (not counting LUN 0) by |
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| default with a max of 32. |
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| Current FCP Edge target to FCP Edge initiator is strictly |
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| Target Discovery |
| The Edge initiator will dynamically discover available targets and |
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| actively login/logout of those targets as conditions warrant. The |
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| WWN and associated port IDs of each currently logged in target, is |
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| forwarded to the associated Edge target on a regular timed interval. |
| McDATA UltraNet Edge 3000 User Guide | ||
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