What is the difference between RAID 5 and RAID 6?
Here you will find out:
- what is the difference between RAID 5 and RAID 6
- what to choose: RAID 6 or RAID 5
- how to recover RAID 5 or RAID 6 data with DiskInternals
Are you ready? Let's read!
About RAID 5
To build RAID 5, you need at least 3 disks, preferably 4 disks. In RAID 5, the parity block is distributed across all disks in the array, providing a more balanced load on them. Checksums are used for data correction/recovery in case of failure of one of the disks.
Depending on where and how parity blocks are located, several varieties of RAID 5 can be distinguished:
- Synchronous RAID 5
- Asynchronous RAID 5
Writing data to an array can be a little faster and a little slower. It all depends on the ratio of the row size and the amount of data:
- When the records are equal to or exceed the row size, the write speed is slightly faster, because reading old blocks is not required.
- When the record size is less than the line, the speed will be noticeably slower; first, old blocks are read, then new ones, then they will be compared, and then recording will follow.
About RAID 6
The minimum number of drives to build RAID 6 is 4 drives. In general, this array expands on the capabilities of RAID 5. RAID 6 provides improved fault tolerance by recording not one set of checksums, but two. Reading here is fast enough because data streams from multiple drives in the array are processed in parallel. RAID 6 is even more expensive than RAID 5, but if you need maximum reliability, then this is the best option.
This type of array withstands the failure of two disks at once, which gives it a great advantage.
RAID 5 vs RAID 6
In order to decide which array to choose, RAID 6 or RAID 5, we suggest focusing on the most important qualities of arrays:
- 1. The minimum number of disks an array can consist of:
- RAID 6: 4 disks
- RAID 5: 3 disks
- 2. Possible protection against disk failure:
- RAID 6: failure of two drives possible
- RAID 5: failure of one drive possible
- 3. Read and write speed:
- RAID 6: low
- RAID 5: fairly low
- 4. Performance:
- RAID 6: for sequential write operations, less than that in RAID 5 by 10-15%
- RAID 5: quite high
- 5. Additional array features:
- RAID 6: archive availability, web maintenance, backup, servers with high capacity requirements
- RAID 5: archive availability and web maintenance
How to recover data from RAID 5 or RAID 6
Since, in modern arrays, there can be two dozen disks, simultaneous or sequential failure of two or more disks does not seem such an unlikely event. Therefore, working with an array, despite the differences between RAID 5 and RAID 6, you must have decent software for data recovery if necessary. This is exactly what DiskInternals RAID Recovery is.
It restores the maximum amount of data in any format from damaged arrays. The utility finds and returns information from Linux, NAS, and UNIX RAID systems. If necessary, it helps you create a disk image. There is a free preview function for visual inspection of files for integrity and quality.
Here are the instructions for using DiskInternals RAID Recovery, so that all stages of recovery are well understood:
First, download and install the application on your computer.
Next, open the program and select the Wizard, which will make the process easier and more understandable.
Select which array will be scanned and then click the Scan button (for quick or full recovery). After a certain period of time, you will see the search results.
All found files can be viewed for free, as mentioned earlier.
After that, when you are assured of the results, buy a license and export data to any information storage device.
This procedure is fast and exciting, because after a few minutes, the seemingly permanently lost files will come back to you.