Disk duplexing is a technique used to protect against data loss in case of a hard disk failure or failure of the hard disk channel. It involves writing data to more than one disk, connected to different disk controllers. The process includes a redundant controller and tape as well, in addition to a redundant hard disk.
Using disk duplexing, you can mirror your hard drive and copy it separately, but also duplex your hard drive. Both hard drives are connected to separate controllers, which means that if one hard drive fails, data can still be retrieved from the other hard drive.
The main difference between disk mirroring and disk duplexing is that with disk duplexing, the hard disks are on separate controllers, eliminating a single point of failure. A read request is made based on the value of the data stored in each location of the two hard disks. Data is transferred via another controller card and not via mirroring.
Disk duplexing improves network I/O performance, but striped RAID backup is not guaranteed. It was developed to protect against data loss due to a hard disk failure or failure of the hard disk channel, which includes the hard disk controller and interface cable. Disk duplexing ensures that if one component in a channel fails, the other hard disk drive in a separate channel can continue to operate without any loss of data or interruption of work routines.
Frequently Asked Questions About Disk Duplexing
What is the difference between disk mirroring and disk duplexing?
With disk mirroring, data is written to two hard disks at the same time, and data is retrieved from both hard disks. In contrast, with disk duplexing, the hard disks are on separate controllers and a read request is based on the value of the data stored in each location of the two hard disks. Data is transferred via another controller card and not via mirroring.
What are the benefits of disk duplexing?
Disk duplexing protects data against loss due to a hard disk failure or failure of the hard disk channel, which includes the hard disk controller and interface cable. It ensures that if one component in a channel fails, the other hard disk drive in a separate channel can continue to operate without any loss of data or interruption of work routines.
Can disk duplexing improve network I/O performance?
Yes, disk duplexing can improve network I/O performance.
Final Thoughts
Disk duplexing is an effective method of protecting data in case of a hard disk failure or failure of the hard disk channel. It is important to maintain the system regularly to avoid any problems with the hard disk controllers or interface cables. With disk duplexing, you can ensure that your data is always safe.
