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In data storage, disk mirroring is the replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability. It is most commonly used in RAID 1. A mirrored volume is a complete logical representation of separate volume copies.
Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.
A typical case where a RAID enters degraded mode is a simple two-drive mirror after a power failure – it is unlikely the drives are in sync. Every time blocks are written to the storage elements (physical drives, in this case), certain accounting information is updated after the write. The RAID controller will notice that the storage elements ...
The array can sustain multiple drive losses so long as no mirror loses all its drives. [29] JBOD RAID N+N: With JBOD (just a bunch of disks), it is possible to concatenate disks, but also volumes such as RAID sets. With larger drive capacities, write delay and rebuilding time increase dramatically (especially, as described above, with RAID 5 ...
An entire office or classroom could thus share a single Omninet-connected Corvus drive. Certain models of the drives offered a tape backup option called "Mirror" to make hard disk backups using a VCR, which was itself a relatively new technology. A standalone version of "Mirror" was also made available.
Advantages include lower power consumption than standard RAID levels, the ability to use multiple hard drives with differing sizes to their full capacity and in the event of multiple concurrent hard drive failures (exceeding the redundancy), only losing the data stored on the failed hard drives compared to standard RAID levels which offer ...
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Western Digital My Book external hard drive. My Book is a series of external hard drives produced by Western Digital.There are at least nine series of My Book drives: Essential Edition, Home Edition, Office Edition, Mirror Edition, Studio Edition, Premium Edition, Elite Edition, Pro Edition, AV DVR "Live Edition", and the World Edition.