What’s the difference between RAID 0 and RAID 1?



September 17th, 2007

Question: Can you explain to me in very simple terms what the difference is between RAID 0 and RAID 1 and what the advantages and disadvantages of each are?

Sure can.

RAID stands for Redundant Array of Independent Disks and this is a technology which turns a collection of hard drives into a single group that offers increased performance and fault tolerance.

RAID 0 is also known as striping which means that data from files is spread across multiple disks.  This has the advantage of improving performance but the disadvantage is that if one drive dies, you lose the data contained on the whole array (so it’s vital to back up your data!).

RAID 1 is also known as disk mirroring or duplexing and here the data on one disk is mirrored onto other drives in the array, this offers a high level of fault tolerance and means that if one drive goes down, your data is still safe.  A disadvantage is that say that you have two 500GB drives in a RAID 1 array, you only get 500GB of space.

So, to sum it up for you, you’d pick RAID 0 for performance and RAID 1 for reliability.

This entry was posted on Monday, September 17th, 2007 at 20:39 and is filed under Questions from Visitors. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

One Response to “What’s the difference between RAID 0 and RAID 1?”

  1. The PC Doctor’s blog » Blog Archive » » Which NAS (Network Attached Storage) device for under $400? Says:

    [...] They offer a pretty painless way to use RAID file system redundancy. [...]