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A quick look at the different RAID levels and how they enhance your data storage
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10/21/2015 -  NAS have greatly evolved over the last decade from being a simple storage solution to something much more. NAS are able to play many different roles, perhaps as a multimedia center, a mini-server, or as a secure, centralized data backup.

One of the most common types of data security deployed on NAS is RAID (Redundant Array of Independent Disks). RAID combines the storage capacity from multiple hard drives and creates logical data storage along with data redundancy. It further employs the technique of disk monitoring and disk stripping, including portioning each drive's storage space into units. The resulting redundancy means if one drive fails the array remains viable preserving data integrity.

Data is distributed across drives in one of several ways depending on the required level of redundancy and performance.  For users there are several RAID levels to choose from. To give you a better overview we will highlight the most common ones and give you a better overview of them.


In RAID 0 the main focus is on having more speed in writing as well as reading. There will be no provided redundancy; hence if there is a failure of one disk it will result in a total loss of data. Performance is the overall goal of this RAID level.


RAID 1 works like a mirror; this is why it is referred to as mirroring. It will read and write the exact same data to a pair of drives. A classic RAID 1 mirrored pair contains two discs at minimum. In this case data is redundantly safe, if one drives goes down, the data still exists on the other drive. In this scenario, if you are using two drives at one TB each, your total capacity will not exceed the one TB.


RAID 5 combines the advantages of RAID 0 and RAID 1, hence it offers both speed and data redundancy. RAID 5 requires at least three disks, however it is mostly recommended to use at least five disks for performance reasons. This level writes data to and reads data from multiple disks. The parity data will be distributed along all the disks in the array and with its help any drive can fail without causing the entire array to fail.

Please be aware RAID 5 is generally considered to be a poor choice for use on write-intensive systems because of the performance impact associated with writing parity information.


RAID 10 combines the benefits of RAID 1 and RAID 0, which offers higher performance than RAID 1 but at a much higher cost. In RAID 1+0, the data is mirrored and the mirrors are striped.


RAID 50 is a configuration that combines RAID 5 distributed parity with RAID 0 striping. This improves the performance of RAID 5 without reducing data protection.


JBOD stands for “just a bunch of disks.” With this option, which actually does not have any impact on performance or redundancy, the user can simply put a group of disks into one single volume.

Thecus NAS allow for a number of ways to enhance your RAID volumes including adding and encryption to RAID volumes and RAID Volume Replication. With easy RAID set-up and even Self-RAID Creation on select NAS, Thecus users are able to get up and running with RAID level volumes quickly and with ease.

About Thecus®
Established in 2004, Thecus Technology Corp provides market leading network attached storage and network video recorder solutions, committed to revolutionize how everyone from home user to enterprise level business centrally stores, manages and accesses their digital data both onsite and cloud-based. Thecus strives to deliver continuous innovation through cutting edge technology and design to provide data storage with the most customer-friendly platform, rapid performance and robust security. In May 2016, Thecus was formally acquired by Ennoconn Corporation and thus became part of the Foxconn IPC Technology group. Partnered together this diverse group of companies work in tandem to provide a total IoT (Internet of Things) solution. Now with an unparalleled portfolio to work with, Thecus is collaborating to bring unprecedented change to the network storage industry.