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If your server contains an Open-AudIT install but not an NMIS install, you can only (at present) export devices from Open-AudIT.
To import devices from NMIS into Open-AudIT you will need (at present) to convert the NMIS Nodes.NMIS file into a spreadsheet and import. You can find that file at /usr/local/nmis8/conf/Nodes.nmis
Exporting devices is the same as above, however because NMIS is not installed, when you click the Export button a file will be provided to download that will contain the required devices in the CSV format of the Nodes. nmis file that NMIS requires. You can copy this to your NMIS server and /or merge it with an existing file to enable your Open-AudIT devices in NMISrun the script /usr/local/nmis8/admin/import_nodes.pl (specifying the names of the CSV) - read the import_nodes.pl file for the options.