Hp XP P9500 Storage User Manual download pdf (Page 23)

I/O operations. This mode is recommended when the number of sequential I/O operations

is large.

• Disable: I/O operation is performed with only one path that is normal and has the highest

priority. The same operation applies as that for Single path mode. When Disable is set for

Load Balance Mode, load distribution is not performed. This mode is not recommended.

If your system is not shown below, refer to http://www.hp.com/storage/spock.

CAUTION: Depending on the external storage type and system configuration, performance may

not be improved when Extended Round-robin is set. In that case, Normal Round-robin is

recommended.

External path configurations — direct and switch

This topic provides recommendations for setting up direct and switch external path configurations.

Direct connection

The following figure shows redundant paths in a direct connection configuration. External storage

system ports, "WWN A" and "WWN B", are connected to the local system ports, "CL1-A" and

"CL2-A" (which are specified as external ports). For greater redundancy, Path 2, the alternate

path, uses ports of a different cluster in both the local and external storage systems.

Switch connection

The following figure shows redundant paths with switches. Ports in the local system are connected

to ports in the external system through the switch. The paths use ports of different clusters for

increased redundancy.

Planning external paths and path groups 23

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Hp XP P9500 Storage User Manual Page 23