HP StorageWorks 300 HP StorageWorks 300 Virtual Library System user guide (AH1 - Page 147
Troubleshooting
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A Troubleshooting This appendix describes some common issues you may encounter while configuring the VLS. Common issues Symptom Possible causes Solution Some of the virtual devices are not detected by the operating system when it scans the SAN for new hardware. There are more LUNs on the FC host ports than the operating system is configured to see. Once the maximum number of LUNs on a device is detected, the operating system stops looking for more LUNs. In the case of the VLS, the operating system considers each FC host port to be one device. So, if the maximum number of LUNs an operating system is configured to see is eight, the operating system will only see LUN0, LUN1, ..., LUN7 and will not see LUN8, LUN9, ..., and up on each FC host port. By default Windows and HP-UX hosts can see a maximum of 8 LUNs per FC host port. Increase the maximum number of LUNs per device the operating system is configured to see. To change the maximum LUN per device setting: • Microsoft Windows-See http://support.microsoft.com/ default.aspx?scid=kb%3benus%3b310072. • HP-UX-The value cannot be changed. • Other operating systems-See the operating system web site. Use the VLS's LUN masking feature to restrict the number of virtual devices the host sees on the VLS FC host port(s), 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 and LUN mapping 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 a FC host port once a gap in the LUN numbering is detected. For example, say LUN0, LUN1, and LUN3 are mapped to a FC host port. The operating system will see LUN0 and LUN1, but 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), or if a virtual device(s) has been destroyed on the VLS, creating a gap in the LUN numbering, restart the VLS device emulations. The VLS software will reassign LUNs to the virtual devices as necessary to remove any gaps in the LUN numbering. See Restarting the VLS device emulations. HP StorageWorks 147