The Netapp System configurator for the DS4243 shows you can get cables in 0.5m, 2m, 5m, 10m and 20m:
http://support.netapp.com/NOW/knowledge/docs/hardware/NetApp/syscfg/scdot81/index.htm
SAS,QSFP-QSFP,CU,100 OHM,0.5M PN: X6557-R6
SAS,QSFP-QSFP,CU,100 OHM,2M PN: X6558-R6
SAS,QSFP-QSFP,CU,100 OHM,5M PN: X6559-R6
SAS,QSFP-QSFP,CU,100 OHM,10M PN: X6590-R6
SAS,QSFP-QSFP,CU,100 OHM,20M PN: X6591-R6
Assuming your using Ontap 8.1 and the latest shelves.
Regards
Martin