HP StorageWorks 6000 HP StorageWorks 6000-series Virtual Library System User G - Page 312

Symptom Possible causes Solution Use the VLS's LUN masking feature to restrict the number of virtual devices the host sees on the VLS FC host ports, so it only sees the virtual devices it needs to see. Then, use the VLS's LUN mapping feature to assign LUNs to the virtual devices the host can see, such that the virtual device LUN numbers include a LUN0 and no gaps in the LUN numbering. See LUN Masking (v3.x) and LUN Mapping (v3.x) for instructions. There is a gap in the LUN numbering on the FC host port. Most operating systems will stop looking for virtual devices on an FC host port once a gap in the LUN numbering is detected. For example, if LUN0, LUN1, and LUN3 are mapped to an FC host port, the operating system will see LUN0 and LUN1. When it does not find a LUN2, it will assume there are no more LUNs on the port and stop looking. Remove the gap in the LUN numbering by editing the host's LUN mapping (see LUN Mapping (v3.x)), or if a virtual device has been destroyed on the VLS, creating a gap in the LUN numbering, restart the VLS device emulations. The VLS firmware will reassign LUNs to the virtual devices as necessary to remove any gaps in the LUN numbering. See Restarting VLS Device Emulations. 312 Troubleshooting