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RAID 1 Explained

RAID 1 replicates an exact copy of data set on two or more than two disk drives. Appropriate utilization of this storage system would be write performance-oriented tasks. These kinds of jobs give focus on writing the data rather than storage capacity. When Raid 1 starts malfunctioning we generally get few common features. These features are to be carefully observed during the process of RAID 1 recovery. Raid data recovery process is not an easy task. Domain knowledge would be the first priority in the process of data Raid recovery. Few things that we need to look at are following:

  • Whether the mirrored data are corrupted or not.
  • Is there any problem in the flow of data which restricts the booting process?
  • Whether corrupted data are moving from one drive to other.

The Raid array can be large and it will contain several partitions. Raid partition recovery during raid recovery process gets complex if there is a problem in a specific partition.

One classic RAID 1 mirrored pair would contain two disk drives. In Raid 1 data recovery this we need to keep in mind that since each member can be addressed independently hence if one disk fails reliability it is a linear multiple of the number of member. In order to achieve the complete redundancy of RAID 1 controller we need to focus on independent controllers. Here sometime we prefer the facility of duplexing or splitting.

However, the size of the array cannot be bigger than the smallest member disk. In a RAID 1 mirrored pair you can typically have two disks for increasing the reliability by two times than a single disk. You can also have more than two copies.

Since each member can be addressed independently if the other fails, reliability becomes a linear multiple of the number of members. To truly get the full redundancy benefits of RAID 1, independent disk controllers are recommended, one for each disk. Some refer to this practice as splitting or duplexing.

If we need the reading facility from the system both the disks should be accessible. We need to check how many disks we can arrange by connecting them together via Raid 1 controller. We need to keep in mind about the maximization of data transfer speed as well.

In some older RAID 1 configuration it would also read two disks at the same time. Process of detecting errors and rectifying the defects in the disks makes useful in commercial environments. Hence while performing the write process the raid array performs like a single disk as all the data would be fully. In RAID 1 a set of disks can be kept as earlier backups used to be taken in tapes making RAID 1 data recovery easier.

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