Disk mirroring involves writing data to multiple disks simultaneously for security reasons, as hard drives eventually fail. It is commonly used by individuals and businesses to protect important data. This is often done through RAID or by updating another hard drive in a different location over an online connection.
Disk mirroring is the process of setting up a computer so that all data is written to multiple disks at the same time. This is generally done mostly for security reasons because there is always a risk of hard drive failure. Usually, disk mirroring involves two actual disks in the system, one is the primary disk and the other is a backup. In some cases, people set up disk mirroring over long distances using strong internet connections.
Hard drives are considered to be quite reliable most of the time, but they contain moving parts and there is a general certainty that they will eventually fail with continued use. Many people protect themselves from this by backing up their data a lot, but for some people this is not safe enough. In these cases, disk mirroring ensures that another perfect replica of the primary system drive is always available.
Most people and businesses that have used disk mirroring do so because they are afraid of losing important data. Many people don’t bother with two hard drives for any reason, and for some people, the only valid reason to have two hard drives would be to increase storage space. People who decide to set up mirroring may be doing important work involving their computers and may fear that any data loss could be extremely detrimental to their life or profession. When companies set up their computers with disk mirroring, it’s often for the same kinds of reasons.
Many computers configured with disk mirroring use an arrangement called a redundant array of independent disks (RAID). This is a method of configuring multiple hard drives to work together. There are several versions of RAID and they are usually numbered RAID 0, RAID 1, etc. RAID 0 is a way to use two hard drives to increase performance and RAID1 is used for mirroring.
Another way to set up disk mirroring is to have another hard drive in another location that is constantly updated with data over an online connection. Sometimes this approach isn’t quite real-time, but usually it’s very close if possible. The idea for this type of setup is to have a replacement hard drive on hand in case some kind of disaster occurs, like a fire. This kind of approach could be used by major government institutions, people involved in scientific research, or anyone else who has an absolutely vital need to protect their data at all costs.
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