Lenovo ThinkServer RD230, Software User'S Manual

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2-14 Introduction to RAID
An automatic drive rebuild will not start if you replace a drive during a
RAID-level migration. The rebuild must be started manually after the
expansion or migration procedure is complete.
2.4.15 Rebuild Rate
The rebuild rate is the percentage of the compute cycles dedicated to
rebuilding failed drives. A rebuild rate of 100 percent means that the
system gives priority to rebuilding the failed drives.
The rebuild rate can be configured 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. Using 0 or 100 percent is not recommended. The default
rebuild rate is 30 percent.
2.4.16 Hot Swap
A hot swap is the manual replacement of a defective drive unit while the
computer is still running. When a new drive has been installed, a rebuild
will occur automatically if:
•
The newly inserted drive is the same capacity as or larger than the
failed drive
•
It is placed in the same drive bay as the failed drive it is replacing
The RAID controller can be configured to detect the new drives and
rebuild the contents of the drive automatically.
2.4.17 Drive States
A drive state is a property indicating the status of the drive. The drive
states are described in
Table 2.3 .
Table 2.3 Drive States
State Description
Online A drive that can be accessed by the RAID controller and
is part of the virtual drive.
Unconfigured
Good A drive that is functioning normally but is not configured
as a part of a virtual drive or as a hot spare.