We support a SAN with ATL M1500 tape libraries attached to an Inrange FC9000 switch. We backup all componenets using Veritas Netbackup Datacenter 4.5. We have lost all backup activity and out tape library and drives are no longer presenting themselves to the Master server (WIN2K Service Pack 3) device manager or registry. We do not have any apparent problems with the switch. Any suggestions? Has anyone experinced a similar issue? Our zoning is correct and the ATL WWN is presented to the switch.