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support.dell.com Setting Up Host Servers 4-5
6. Press the up- or down-arrow key to highlight the execution throttle value and
press <Enter>.
The Enter Decimal Number screen appears.
7. Type the desired value in the New column and press <Enter>.
The Advanced Adapter Settings screen appears and the execution throttle
value is now set correctly.
If you need to change the value, repeat steps 6 and 7.
8. Press the <Esc> key twice, select Save Changes, and press <Enter>.
9. Repeat this procedure for each installed adapter and for each server.
NOTICE: Flashing the NVRAM automatically sets the execution throttle
value to 90. Therefore, you must verify these values every time NVRAM is
flashed. If the value is set too high, attached servers may indicate an I/O
time-out generated by the QLogic Fibre Channel device driver (ql2100 or
ql2200) in the data section of the Windows NT Event Viewer system log. Do
not alter other NVRAM settings from their default values unless directed to
do so by Dell support personnel or by more recent Dell documentation.
Setting Failover Paths
The QLogic Fibre Channel Configuration Utility provides a multipathing failover solu-
tion for host servers. Two Fibre Channel ports on the PowerVault 530F with the same
worldwide name (WWN) (Node Name) comprise a virtual target.
When connections are made, each host server should be configured to see two paths
to each virtual target. For the best performance, make sure to load balance when
choosing primary and failover paths. Figure 4-1 illustrates an example of how to load
balance in a failover configuration.
NOTES: Ensure that both host paths are connected and operational before rebooting
the host. If the primary path is not operational, it is possible that the LUNs are not vis-
ible. If the primary path is not available and it is necessary to reboot the host, set the
failover path to primary, and then reboot.
When a path fails under Windows 2000, you may see the message Unsafe
Removal of Device, indicating a device was ejected without being stopped. Disre-
gard this message in this instance.