has a capacity closest to and at least as great as that of the failed drive to take the place of the failed drive.
Note: Hot spares are employed only in arrays with redundancy— for example, RAID levels 1, 5, 10, and 50. A hot spare connected to a specific MegaRAID SCSI
2.3.10 Hot Swapping
Hot swapping is the manual replacement of a defective physical disk unit while the computer is still running. When a new drive has been installed, you must issue a command to rebuild the drive.
2.3.11 Disk Rebuild
You rebuild a disk drive by recreating the data that had been stored on the drive before the drive failed. Rebuilding can be done only in arrays with data redundancy such as RAID level 1, 5, 10, and 50.
Standby (warm spare) rebuild is employed in a mirrored (RAID 1) system. If a disk drive fails, an identical drive is immediately available. The primary data source disk drive is the original disk drive.
A hot spare can be used to rebuild disk drives in RAID 1, 5, 10, or 50 systems. If a hot spare is not available, the failed disk drive must be replaced with a new disk drive so that the data on the failed drive can be rebuilt.
The MegaRAID SCSI
2.3.11.1Rebuild Rate
The rebuild rate is the fraction of the compute cycles dedicated to rebuilding failed drives. A rebuild rate of 100% means the system is totally dedicated to rebuilding the failed drive.
RAID Overview |
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