Difference between Raid0 and Raid 1

[rubbio_young]

• RAID 0 (striped disks) distributes data across multiple disks in a way that gives improved speed at any given instant. If one disk fails, however, all of the data on the array will be lost, as there is neither parity nor mirroring. In this regard, RAID 0 is somewhat of a misnomer, in that RAID 0 is non-redundant. A RAID 0 array requires a minimum of two drives. A RAID 0 configuration can be applied to a single drive provided that the RAID controller is hardware and not software (i.e. OS-based arrays) and allows for such configuration. This allows a single drive to be added to a controller already containing another RAID configuration when the user does not wish to add the additional drive to the existing array. In this case, the controller would be set up as RAID only (as opposed to SCSI only (no RAID)), which requires that each individual drive be a part of some sort of RAID array.
• RAID 1 mirrors the contents of the disks, making a form of 1:1 ratio realtime backup. The contents of each disk in the array are identical to that of every other disk in the array. A RAID 1 array requires a minimum of two drives. RAID 1 mirrors, though during the writing process copy the data identically to both drives, would not be suitable as a permanent backup solution, as RAID technology by design allows for certain failures to take place.

[ashely]

I got asked this in a job interview and while I had used them before I had a difficult time remember what was what and how to explain it. so thank you for the break down. Have implanted this in my brain for the next time

[diagurzula]

RAID 0
-> Use if you want good read and write performance
-> Strips data across multiple disks
-> No Fault tolerance
-> Good for Workstation computers or application which needs fast disk I/O
-> Minimum requirement: 2 hard disk

RAID 1
-> Use for mirroring (hard disk to hard disk or partition to partition )
-> Fault tolerance
-> Use this if you want exact copies of data
-> Minimum requirement: 2 hard disks

[starsevenrock]

RAID 1 and RAID 0 array to store information in very different ways:
- RAID 1 mirror array data
-RAID 0 arrays stripe data.
RAID 0 can block striping, yields higher performance than individual movements. There is no redundancy, where as RAID 1:
Drives are paired and mirrored. All items are 100% copied to a
equivalent unit.