HP StorageWorks XP10000 Disk Array - Manual (Page 29)

ports where a larger amount of data is transferred, you can optimize system performance. If you set
a slower data transfer speed for ports where a smaller amount of data is transferred, you can also
optimize performance.
For more information, see
Specifying a Fibre Channel port's data transfer speed .
Standard, High Speed, and Initiator/External MIX modes
Channel adapter boards have built-in ports used for connecting hosts and an array. Ports can be in
Standard, High Speed, or Initiator/External MIX mode, although all ports are in Standard mode
by default. If a port satisfies certain conditions, you can apply High Speed mode to improve port
performance. If a port satisfies certain conditions, you can apply Initiator/External MIX mode so that one
part can be used both as an initiator port for Continuous Access XP or Continuous Access XP Journal and
as an external port applied to a remote command device. For instructions on defining a remote command
device, see the HP StorageWorks External Storage XP user guide.
You must apply High Speed or Initiator/External MIX mode to groups of four ports, not to individual
ports. In LUN Manager terminology, each group of four ports is referred to as a port block. You can
apply High Speed or Initiator/External MIX mode to each port block.
When you apply High Speed or Initiator/External MIX mode, two of the four ports in a port block must
satisfy the following conditions. Also, the other two ports must satisfy the following conditions:
• The two ports have the same Fabric option (Enable or Disable).
• The two ports have FC-AL as the Connection option.
• The two ports use different port addresses and no matching addresses.
• When you apply High Speed mode, the two ports have the same port attribute (Initiator, RCU
target, or Target).
• When you apply Initiator/External MIX mode, one of the two ports takes the initiator attribute
and the other port takes the external attribute.
• Only one of the ports is used for connecting the host.
Figure 8 shows an example of High Speed or Initiator/External MIX mode applied to one or two port
blocks when the channel adapter board has eight ports. If the channel adapter board has 16 ports,
you can apply High Speed or Initiator/External MIX mode in the same way, even though there are
four port blocks.
HP StorageWorks LUN Configuration and Security Manager XP user guide for the
XP12000/XP10000/SVS200
29