5.1 General setup
This is what you need for any of the RAID levels:

A kernel. Preferably a kernel from the 2.4 series. Alternatively a 2.0 or 2.2 kernel with the RAID patches applied.
The RAID tools.

All of this is included as standard in most GNU/Linux distributions today.
If your system has RAID support, you should have a file called /proc/mdstat. Remember it, that file is your friend. If you do not have that file, maybe your kernel does not have RAID support. …

It is a cryptographic security function. It defines the procedure which has all the data information. They are used for securtiy applications. It is mainly used to secure HTTP connections.