RAID 5: A powerful technology to ensure the integrity of your data.
Developed in the early 80's, RAID technology is used to improve performance and fault tolerance. RAID 5, which is one of the most commonly used RAID systems, provides both security and performance and is based on at least three hard drives.
RAID 5: What you need to understand.
The operation of RAID 5.
Like any RAID system, RAID 5 uses multiple hard drives clustered together to form a single logical drive. In the RAID 5 system, the data is divided into a minimum of three hard disks to a maximum of sixteen. Unlike RAID 0, the data is interspersed with parity bits in case of the event of a hard disk failure. The parity bits are inserted after a sequence of saved data and are distributed on all the disks.
RAID 4, which also uses the parity bits, concentrates them on a single hard disk. In the event of a hard disk failure, the risk of data loss is low. If data is damaged, the previous bits and the parity block make it possible to recover the lost data. If the parity bit is damaged, the data is intact and therefore accessible without problems. Since after a number of disks, a parity bit is written, the space actually available on N disk number is N-1. For example, on five 500GB disks that offer a total of 2.5TB of space, only 2TB is available.
What’s the best RAID system for you?
RAID 5 vs RAID 6.
Like RAID 5, RAID 6 has a parity distribution. Both systems work the same way. The RAID 5 is particularly known for its high performance and its tolerance to breakdowns. In addition, your data is protected in the event of a failure, provided that the failure is on a single disk.
When data loss occurs on a single disk, the data remains accessible but there will be a drop in performance until the missing data is restored. On the other hand, if the failure concerns over several disks, the data will be lost. This is where you will find all the advantages of a RAID 6 - it is able to keep all of your data even if two disks fail. One disadvantage is that RAID 6 is slower than RAID 5.
RAID 5 vs RAID 1.
RAID 5 or RAID 10.
What is RAID 5 spare?
As a reminder, the RAID 5 requires a minimum of 3 hard drives. The RAID 5 spare has 4 disks; the fourth unit being used as a spare. This guarantees the safety of your data, with the spare only being used when one of the disks fails. In short, the RAID 5 spare meets your needs if you want to benefit from increased security.
RAID 5 capabilities.
RAID 5 makes it possible to simultaneously use all its disks (this one consists of at least 3 disks). It is a high-performance system for reading and writing and offers great fault tolerance.
The RAID 5 also offers a high capacity equivalent to N-1, where N is the total number of disks. The effective usable capacity of RAID 5 is the total capacity of all units minus the capacity of a hard drive.
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