Dell PowerVault MD3000 - Manual (Page 43)

Post-Installation Tasks
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round-robin with subset path selection policy is used to route I/O requests
between paths with the same weight value. The least path weight with subset
load balance policy is not supported on Linux operating systems.
Setting Load Balance Policies in Linux
Two options are available for setting the load balance policies for the Linux
operating system:
• Using the mppUtil command
• Using the mpp.conf file
NOTE:
The only load balancing policy options for Linux are 0x0 (round robin)
and 0x1 (least queue depth).
The mppUtil command includes the option of implementing the changes
immediately; however, changes do not persist after rebooting the host.
1 Are you using the mppUtil command?
• Yes – Go to step 2.
• No – Go to step 5.
2 Do you want to implement the change immediately without having the
change persist after rebooting the host?
• Yes – Go to step 3.
• No – Go to step 4.
3 Run this command:
mppUtil -o LoadBalancePolicy=n
where n is 0 for round robin or 1 for least queue depth. This change takes
effect immediately and affects only the in-memory state of the load balance
policy. The change will not persist after rebooting the host.
Once you have successfully run the mppUtil command, your load balancing
steps are complete. You do not need to continue from here.
4 If you chose the Yes option in step 2 above, run this command:
mppUtil -o LoadBalancePolicy=n, SaveSettings
where n is 0 for round robin or 1 for least queue depth. The SaveSettings
parameter lets the load balance setting persist after rebooting the host. Go to
step 6 to complete the procedure.