for reference, answer is   iiq_data_export perf export -c  --data-module disk_adv_io_queue --fmt-time -i 4W where --fmt-time is so data is exported with date/time readable rather than in unix epoch ( posix) format and -i 4W is give me last 4 weeks of data  
is there a equivalent of iiq_data_export perf export -c --data-module disk_adv_io_queue    to get the last 1 months of disk performance data as against the current data ? I know the data in the back end database, just not the command to extract 
insightiq export historical disk performance data