Lenovo ThinkServer RD240 Software User's Manual page 290

Figure 8.29 Set Adjustable Task Rates
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3. Enter changes, as needed, to the task rates for Rebuild Rate,
Background Initialization (BGI) Rate (for fast initialization), and Check
Consistency Rate (for consistency checks). Each task rate can be
set from 0 to 100. The higher the number, the faster the activity will
run in the background, possibly impacting other system tasks.
4. Click Go to accept the new task rates.
5. When the warning message appears, click OK to confirm that you
want to change the task rates.
Configuration