v L Port - arbitrated loopv N Port - point to point protocol in a switched fabric topologyCables and SpeedsUltrium 3, Ultrium 4, and Ultrium 5 Fibre Channel tape drives use LC duplex fiberoptics cables.The maximum distances that the library supports on a Fibre Channel link isdetermined by the link speed, the type of fiber (50-micron or 62.5-micron), and thedevice to which the library is attached.If the library attaches to an HBA (Host Bus Adapter), refer to the distances that aresupported by the HBA. If the library attaches to a switch, the supported distancesare:v For a multi-mode 50-micron cable:– 1-Gbit link speed = up to 500 m (1640 ft)– 2-Gbit link speed = up to 300 m (984 ft)– 4-Gbit link speed = up to 175 m (574 ft)– 8-Gbit link speed = up to 150 m (492 ft)v For a multi-mode 62.5-micron cable:– 1-Gbit link speed = up to 300 m (984 ft)– 2-Gbit link speed = up to 90 m (295 ft)– 4-Gbit link speed = up to 50 m (164 ft)– 8-Gbit link speed = up to 21 m (68 ft)Note: Minimum distance for both 50 micron and 62.5 micron is 2 m (6 ft).The library uses 50-micron cables internally. Therefore, you must use a 50-microncable to attach to the library's port. To attach to a 62.5-micron SAN, you mustattach the 50-micron cable to an active port, such as a port on a switch.Using Zoning to Isolate Devices and Enhance SecurityFor security reasons, it is important to limit the devices that a server or servers canrecognize or access. Also, some performance configurations and SANconfigurations can result in a device being seen multiple times from the sameserver. For example, if you have two HBAs from the same server connected to anUltrium Tape Drive in the library, the drive will be detected and appear as twological devices. That is, there will be two special files for one physical device.Zoning can address these issues.Zoning allows you to partition your SAN into logical groupings of devices so thateach group is isolated from the other and can only access the devices in its owngroup. Two types of zoning exist: hardware zoning and software zoning. Hardwarezoning is based on physical fabric port number. Software zoning is defined with aWorld Wide Node Name (WWNN) or World Wide Port Name (WWPN). Whilezoning can be reconfigured without causing an outage, some zoning configurationscan become complicated. The advantage of the library's WWNN implementation isthat you can avoid the exposure of introducing zoning errors because you do nothave to change the zoning configuration if a drive needs service or replacement.Sharing on a Storage Area NetworkWith Storage Area Network (SAN) components, the possibilities for connectingmultiple systems and multiple drives have increased. Not all software and systems3-10 Dell PowerVault TL2000 Tape Library and TL4000 Tape Library User's Guide
