ND 6, 7 (& 8) are EOS. ND 7 is still in extended service and supported platforms are listed here: https://www.ibm.com/software/reports/compatibility/clarity-reports/report/html/osForProduct?deliverableId=1AB7F4000ABD11E8BE1A0F0F1F3F9A88&osPlatforms=Linux&duComponentIds=S003|S001|S002 ...