HP StorageWorks XP Remote Web Console Software - Manual (Page 19)

LUN Configuration and Security Manager XP user guide for the XP1024/XP128 19
• Continuous Access XP volumes
• BC volumes
• External LUs
• iSCSI volumes (volumes to which paths are defined from iSCSI ports)
• Flex Copy XP volumes
You cannot use an LDEV as a command device if a path is defined between an iSCSI port and the LDEV.
If you want to use a LUSE volume as a command device, you must specify only the first LU as the
command device.
Fibre Channel port attributes
In Fibre Channel environments, you must configure the Fibre Channel topology and set addresses for the
Fibre Channel ports. You can enhance system performance by adjusting the data transfer speed at the
Fibre Channel ports and changing the channel adapter mode.
Fibre Channel topologies
Fibre Channel provides the following topologies:
• Fabric: Uses a fabric switch to connect a large number of devices. Each device has the full bandwidth
of 100 MB/sec.
• FC-AL (Fibre Channel-Arbitrated Loop): A shared-bandwidth topology that can connect up to 126
devices (AL ports).
• Point-to-point: A simple Fibre Channel topology in which two devices are connected directly.
When configuring the disk array, use LUN Manager to specify whether the hosts and the disk array are
connected by a fabric switch. Also, you must specify FC-AL or point-to-point in the LUN Manager pane.
The default is FC-AL.
If you are using a fabric switch, consult the switch’s documentation to learn whether FC-AL or
point-to-point should be used. Some fabric switches require that you specify point-to-point to get the system
running.
Arbitrated loop physical addresses
You will need to set addresses for Fibre Channel ports. When addressing Fibre Channel ports, you can
use AL-PA (arbitrated loop physical address) or loop IDs as the addresses (see Table 4 ).
Table 4 AL-PA and loop IDs
AL-PA Loop ID AL-PA Loop ID AL-PA Loop ID AL-PA Loop ID
EF 0 B2 32 72 64 3A 96
E8 1 B1 33 71 65 39 97
E4 2 AE 34 6E 66 36 98
E2 3 AD 35 6D 67 35 99
E1 4 AC 36 6C 68 34 100
E0 5 AB 37 6B 69 33 101
DC 6 AA 38 6A 70 32 102
DA 7 A9 39 69 71 31 103
D9 8 A7 40 67 72 2E 104
D6 9 A6 41 66 73 2D 105
D5 10 A5 42 65 74 2C 106
D4 11 A3 43 63 75 2B 107
D3 12 9F 44 5C 76 2A 108