Creating RAID 5 (Striping with Distributed Parity) in Linux – Part 4

In RAID 5, data strips across multiple drives with distributed parity. The striping with distributed parity means it will split the parity information and stripe data over the multiple disks, which will have good data redundancy.

Setup Raid 5 in Linux

For RAID Level it should have at least three hard drives or more. RAID 5 are being used in the large scale production environment where it’s cost effective and provide performance as well as redundancy.

What is Parity?

Parity is a simplest common method of detecting errors in data storage. Parity stores information in each disks, Let’s say we have 4 disks, in 4 disks one disk space will be split to all disks to store the parity information’s. If any one of the disks fails still we can get the data by rebuilding from parity information after replacing the failed disk.

Pros and Cons of RAID 5

1. Gives better performance
2. Support Redundancy and Fault tolerance.
3. Support hot spare options.
4. Will loose a single disk capacity for using parity information.
5. No data loss if a single disk fails. We can rebuilt from parity after replacing the failed disk.
6. Suits for transaction oriented environment as the reading will be faster.
7. Due to parity overhead, writing will be slow.
8. Rebuild takes long time.

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