If all servers carry the same I/O load, calculate the execution throttle value by dividing 480 by the number of servers in the SAN. Set each HBA in the SAN to the calculated value.
For example, in a
If some of the servers carry heavier I/O loads, first calculate the execution throttle value by dividing 480 by the number of servers, and then adjust the values so that servers with higher I/O loads have higher execution throttle values and servers with lower I/O loads have lower execution throttle values.
For example, in an
When calculating the execution throttle value, remember the following:
•Dell recommends that you set all HBAs in a server to the same execution throttle value.
•The sum of execution throttle values of host servers attached to the PowerVault 530F should never exceed the maximum queue depth of 480.
To change the execution throttle value in the NVRAM of the HBA, perform the follow- ing steps:
1.Turn on or reboot the server.
2.When the QLogic basic input/output system (BIOS) message appears during the
If the server has more than one HBA installed, the Select Host Adapter screen appears, listing each installed HBA and the corresponding address. If the server has only one HBA installed, the Controller screen appears, listing options for the selected HBA.
3.If the Select Host Adapter screen appears, press the up- or
The Controller screen appears, listing options for the selected controller.
4.Press the up- or
The Configuration Settings screen appears, listing configuration settings.
5.Press the up- or
The Advanced Adapter Settings screen appears, displaying the current settings for this adapter.