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3. Enter changes, as needed, to any of the task rates:
–
–
–
–
–
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.
Note:
Changing Power Settings
The RAID controller includes Dimmer Switch™ technology that conserves energy by placing
certain available online drives into a powersave mode. In a powersave mode, the drives use less
energy, and the fan and the enclosure requires less energy to cool and house the drives. Also,
this technology helps avoid application time-outs caused by spin-up delays and drive wear caused
by excessive spin-up/down cycles.
You can use the Power Settings field in MegaRAID Storage Manager software to choose whether
to allow unconfigured drives or hot spares to enter a powersave mode.
Note:
When they are in the powersave mode, unconfigured drives and drives configured as hot spares
(dedicated or global) can be spun down. When spun down, the drives stay in powersave mode
except for periodic maintenance, including:
•
Periodic background media scans (Patrol Read) to find and correct media defects to avoid
losing data redundancy (hot spare drives only)
•
Use of a hot spare to rebuild a degraded drive group (hot spare drives only)
Configuration
DB09-000202-05 37857-02
Rev. F - May 2011
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 problems 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).
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.
The Dimmer Switch technology is enabled by default.
Copyright © 2011 by LSI Corporation. All rights reserved.
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