There are two forms of RAID 1: disk duplexing and disk mirroring. Disk mirroring involves two hard drives that are on the same drive controller. The same...
Fault tolerance method in which two disk controllers are used in a single server.
Attaching mirrored disks to separate disk controller boards. Disk duplexing provides more security than disk mirroring because it duplicates not just the disk, but also the controller channel (which includes the controller board and cables) as well. See also Disk mirroring.
the procedure of copying data onto two hard drives, each using its own hard drive controller. If any component (hard drive controller card, cable, boot hard drive) on the first channel fails, then the second channel will boot and operate normally.
In networking, a fault-tolerant technique that writes the same information simultaneously onto two different hard disks, using tow different disk controllers to provide greater redundancy..This is done so that in the event of one disk or disk controller failing, information from the other system can be used to continue operations.
Disk duplexing is a variation of disk mirroring in which each of multiple storage disks has its own SCSI controller. Disk mirroring (also known as RAID-1) is the practice of duplicating data in separate volumes on two hard disks to make storage more fault-tolerant. Mirroring provides data protection in the case of disk failure, because data is constantly updated to both disks. However, since the separate disks rely upon a common controller, access to both copies of data is threatened if the controller fails. Disk duplexing overcomes this problem; the use of redundant controllers enables continued data access as long as one of the controllers continues to function.
A variation on disk mirroring in which a second disk adapter or host adapter and redundant disk drives are present.
The method of how information is written to the hard disk drive. With disk duplexing, when information is to be written to a hard disk drive, it is copied to multiple drives – generally on different disk controllers.