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drive and press Enter. A submenu is displayed. Select Make Hot Spare from the submenu and then
select Yes when prompted to set the physical drive as a hot-spare drive.
Rebuilding a physical drive
This topic provides instructions on how to rebuild a physical drive using the LSI Software RAID Conguration
Utility program when a physical drive in an array fails.
When a drive in a RAID drive group fails, you can rebuild the drive by recreating the data that was stored on
the drive before it fails. If the drive is not operational, it must be replaced and the data on the failing drive
must be rebuilt on a new drive to restore the system to fault tolerance. If hot-spare drives are available, the
failing drive might be rebuilt automatically without any user intervention.
The RAID controller recreates the data using the data stored on other drives in the drive group. Rebuilding
can be done only in drive groups with data redundancy, such as RAID 1, 5, and 10 drive groups. For a
detailed introduction to disk rebuild, refer to “Introduction to RAID” in the MegaRAID SAS Software User
Guide on the documentation DVD that comes with your server.
To rebuild a physical drive using the LSI Software RAID Conguration Utility program when a physical
drive in an array fails, do the following:
1. Start the LSI Software RAID Conguration Utility program. See “Starting the LSI Software RAID
Conguration Utility program” on page 74.
2. On the main interface of the program, select Rebuild and follow the instructions on the screen.
Note: Running a consistency check immediately after the rebuild completes to ensure data integrity for the
virtual drives. See “Running a consistency check” on page 78.
The rebuild rate is the percentage of the computing cycles dedicated to rebuilding failing drives. A rebuild
rate of 100 percent means that the system gives priority to rebuilding the failing drives. The rebuild rate can
be congured between 0 percent and 100 percent. At 0 percent, the rebuild is done only if the system is not
doing anything else. At 100 percent, the rebuild has a higher priority than any other system activity.
To congure the rebuild rate using the LSI Software RAID Conguration Utility program, do the following:
Note: Using a rebuild rate of 0 or 100 percent is not recommended. The default value is 30 percent.
1. Start the LSI Software RAID Conguration Utility program. See “Starting the LSI Software RAID
Conguration Utility program” on page 74
.
2. On the main interface of the program, select Objects ➙ Adapter ➙ Rebuild Rate.
Note: Use up and down arrow keys to navigate between items and press Enter to select an option.
3. Set the rebuild rate by typing a desired value from the keyboard directly.
Running a consistency check
This topic provides instructions on how to run a consistency check for virtual drives using the LSI Software
RAID Conguration Utility program.
A consistency check is an operation that veries that all stripes on a virtual drive with a redundant RAID
level are consistent. The consistency check operation veries correctness of the data on virtual drives that
use RAID 1, 5, and 10 (RAID 0 does not provide data redundancy). For example, in a system with parity,
checking consistency means computing the data on one drive and comparing the results to the contents of
the parity drive.
You should run a consistency check on fault-tolerant virtual drives periodically. It is recommended that you
run a consistency check at least once a month. You must run a consistency check if you suspect that the
78 ThinkServer Hardware Maintenance Manual