MegaRAID Storage Manager Online Help System

Configuration > Changing Adjustable Task Rates

Changing Adjustable Task Rates

Follow these steps if you need to change the adjustable rates for rebuilds, and other system tasks that run in the background:

LSI recommends that you leave the adjustable task rates at their default settings to achieve the best system performance. If you raise the task rates above the defaults, foreground tasks will run more slowly and it might seem that the system is not responding. If you lower the task rates below the defaults, rebuilds and other background tasks might run very slowly and might not complete within a reasonable time. If you decide to change the values, record the original default value here so you can restore them later, if necessary:
Rebuild Rate: ____________
Background Initialization (BGI) Rate: ____________
Check Consistency Rate: ____________

  1. Select a controller icon in the Physical tab or the Logical tab in the left panel of the MegaRAID Storage Manager window.
  2. Select Go To->Controller->Set Adjustable Task Rates from the menu bar.
  3. The Set Adjustable Task Rates screen appears, as shown in Figure 17.
    Figure 17 Set Adjustable Tax Rates Menu



    The Set Adjustable Task Rates dialog box appears, as shown in Figure 18.
    Figure 18 Set Adjustable Task Rates Dialog Box



    Each task rate can be set from 0 to 100 percent. The higher the number, the faster the activity runs in the background, possibly impacting other system tasks.
  4. Enter changes, as needed, to the following task rates:
    • Rebuild Rate. Enter a number from 0 to 100 to control the rate at which a rebuild will be performed on a drive when one is necessary. The higher the number, the faster the rebuild will occur (and the system I/O rate may be slower as a result).
    • Patrol Rate. Enter a number from 0 to 100 to control the rate at which patrol reads will be performed. Patrol read monitors drives to find and resolve potential problem that might cause drive failure. The higher the number, the faster the patrol read will occur (and the system I/O rate may be slower as a result).
    • Background Initialization (BGI) Rate Enter a number from 0 to 100 to control the rate at which virtual drives are initialized “in the background.” Background initialization establishes mirroring or parity for a RAID virtual drive while allowing full host access to the virtual drive. The higher the number, the faster the initialization will occur (and the system I/O rate may be slower as a result).
    • Check Consistency Rate. Enter a number from 0 to 100 to control the rate at which a consistency check is done. A consistency check scans the consistency data on a fault tolerant virtual drive to determine if the data has become corrupted. The higher the number, the faster the consistency check is performed (and the system I/O rate may be slower as a result).
    • Reconstruction Rate. Enter a number from 0 to 100 to control the rate at which reconstruction of a virtual drive occurs. The higher the number, the faster the reconstruction occurs (and the system I/O rate may be slower as a result).
  5. Click OK to accept the new task rates.
  6. When the warning message appears, click OK to confirm that you want to change the task rates.
  7. The Controller Operations tab also has options for disabling or silencing the alarm on the controller. Ordinarily you should leave the alarm enabled so it can warn you of abnormal conditions on the controller. You might need to silence the alarm if, for example, the alarm is malfunctioning and is sounding continuously.


DB09-000202-04  37857-02  Rev. E  October 2010
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