Page 71 - RHEL8 BOOK

RAID

 RAID: - Collection of individual physical disk in a functionality they work as one disk, name as Meta
device (RAID disk).
o Mainly we implement RAID in order to increase the storage capacity along with data security.
o An advantage of RAID to prevent data loss.
o RAID is a technology that employs the simultaneous use of two or more partitions on the same
or different hard disk drives to achieve greater levels of performance and reliability.

 Types of RAID
1. HARDWARE RAID
2. SOFTWARE RAID

 HARDWARE RAID: - In order to configure a hardware RAID, the hardware devices should
support the features of RAID.

 SOFTWARE RAID: - It provides a way to configure RAID features by using the hardware devices
which are not compatible of RAID. Here the OS should have the feature of RAID

 RAID LEVELS available in Linux
 RAID 0 (STRIPING WITHOUT PARITY).
 RAID 1 (MIRRORING)
 RAID 4 (PARITY)
 RAID 5 (STRIPING WITH PARITY)

 We need to configure the RAID disk with any one of the RAID level, A RAID level defines the method
of data storage and retrieval. The actual data which has to be maintained in RAID disk is called as
“chunk” which of size 64KB

 RAID 0: -
 Minimum 2 Hard disk
 Maximum 32 Hard disk
 Data is written simultaneously and evenly to two or more disks.
 Read and write speed is fast

 Fault tolerance is not available

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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