Beckhoff CX2550-0020, Manual

Page: 27 / 41

Commissioning
CX2550-0020 27 Version: 1.1
5.5 Setting up a RAID system
It is possible to set up a RAID system, in order to enhance data security. In a RAID system, physically
available storage media, including hard drives or Flash cards, are organized in a logic drive.
On these storage media, redundant information is created in a targeted manner and mirrored to all storage
media integrated in the RAID system. If individual storage media fail due to defects, for example, the data is
not lost. A faulty storage medium can be replaced with a new one. The data is restored on the new storage
medium with the aid of the remaining storage medium. In this way the original state can easily be restored.
The following RAID options can be selected to set up a RAID system:
• RAID 1 (real-time data protection) is used to mirror a storage media. Data is written redundantly on two
storage media. If a storage medium fails, it can be replaced. The data is restored on the new storage
medium with the aid of the remaining storage medium.
• RAID 0 (optimized disk performance) is used to increase the speed of the storage media. The data is
distributed to both storage media but not stored redundantly. The aim is not data security, but
maximum write and read speed.
• RAID 5 (efficient data hosting and protection) is used to combine data security and performance. RAID
5 offers data security through redundancy as well as higher data throughput. For this option at least
three storage media are required.
Note
Optimum RAID system
An inappropriate RAID option can lead to data loss. Ensure optimum data security for your
system and the devices used in it.
Only use the RAID 1 option for your RAID system, in order to ensure enhanced data secu-
rity in case of failure of the storage media.
Recommendations
1. For a RAID system, only the RAID 1 option is recommended and described in the documentation.
2. Make regular backups of your system. Note that a RAID system only protects against hardware fail-
ures (storage media). The RAID system does not protect against data corruption, which makes the
storage medium unusable.
3. Use an USV so that no corrupt data is written on the storage media during a power failure.
4. Use storage media suitable for industrial use supplied by Beckhoff.
Chapter overview
The following sections describe how to set up a RAID system with the following two methods:
• Using a Beckhoff USB stick with integrated Beckhoff Service Tool
(see: Using the Beckhoff USB stick for setting up the system [
}
28] ).
• Using the Intel Manager, which is pre-installed on your device. This method has the advantage that the
image does not have to be reinstalled
(see:
Using the Intel Manager for setting up the system [
}
29] ).
• Special function: The recovery function protects against data corruption and copies data from a
master to a recovery storage medium (see: Using the recovery mode [ } 35] ). This allows to save valid
data on a second storage media and to be restored if required.