Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 46

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 Online Unconfigured Good Description A drive that can be accessed by the RAID controller and is part of the virtual drive. A drive that is functioning normally but is not configured as a part of a virtual drive or as a hot spare. 2-14 Introduction to RAID