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RAID MANAGEMENT

What is RAID ?

The word RAID refers to technologies for distributing data on multiple hard drives to improve fault tolerance and/or increase disk performance

Using RAID does not exclude the necessity to make regular data backups.

The different types of RAID

RAID 0

Both disks are combined into one virtual disk to get more available space.
This improves the performance of reading and writing on the server.

  • Fault tolerance: 0
  • Minimum number of disks: 2
  • Available space: sum of all disks

RAID 1

This mode provides a fault tolerance in the event of one disk failure. All data is written identically to two disks.
This will also increase the read performance, but it slows down the write performance.
This is the recommended mode for servers equipped with two hard drives.

  • Fault tolerance: 1
  • Minimum number of disks: 2
  • Available space: size of the smallest disk

RAID 5

This mode provides fault tolerance of 1 hard drive by performing parity checking on all hard disks.
The total space of the virtual disk is the sum of all drives minus one.
This means, if you have 3x 4TB, you’ll have 2x 4TB available
If one disk fails, no data loss should be expected.

  • Fault tolerance: 1
  • Minimum number of disks: 3
  • Available space: (Number of disks * size of the smallest disk) – (1 * the size of the smallest disk)

RAID 6

This is an evolution of RAID 5 that works in the same way but increases fault tolerance

  • Fault tolerance: 2
  • Minimum number of disks: 3
  • Available space: (Number of disks * size of the smallest disk) – (2 * the size of the smallest disk)

NORAID

This allows the independent use of the disks, as if there would be no RAID controller

  • Fault tolerance: 0
  • Minimum number of disks: 2
  • Available space: sum of the space of all disks

Change of the RAID type

It is mandatory that you install an OS before you can make any change to the RAID configuration

You can change your RAID directly in your console using the following menus:

  • Server
  • Server list
  • Manage
  • RAID Configuration (on the left)
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