Help Me Choose: RAID Configuration

Level/Description Fault Tolerance Advantage Disadvantage
RAID 0

Maps data across the drives to create large virtual disks. Provides improved performance because each physical disk handles only part of the request. However, one drive failure makes the VD inaccessible and the data is lost permanently.
None Improved performance
Additional storage
Should not be used for critical data
RAID 1

Mirrors data, where data is stored redundantly across two drives. If one disk fails, the other takes over and functions as the primary drive.
Disk errors
Single disk failures
High read performance
Fast recovery after drive failure
Data redundancy
High disk overhead
Limited capacity
RAID 5

Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Parity bits contain information that enables a disk’s data to be recreated from the remaining disks in the event of single disk failure.
Disk errors
Single disk failures
Efficient use of drive capacity
High read performance
Med-to-High write performance
Disk failure medium impact
Longer rebuild due to parity recalculation
RAID 6

Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Unlike RAID 5, RAID 6 makes two parity calculations — P & Q — enabling it to withstand dual disk failures.
Data redundancy
High read performance
Disk errors
Dual disk failures
Write performance decrease due to dual parity calculations
Extra cost due to 2 disk equivalent devoted to parity
RAID 10

Stripes over mirrored sets. High disk overhead, but excellent solution for those requiring high performance & redundancy plus the fastest recovery in the event of drive failure.
Disk errors
One disk failure per mirrored set
High read performance
Supports largest RAID group of 192 drives
Most expensive
RAID 50

Stripes over RAID 5 sets. A performance increase over RAID 5 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
Disk errors
Single disk failure per span
High read performance
Med-to-High write performance
Supports largest RAID group of 192 drives
Disk failure medium impact
Longer rebuild due to parity recalculation
RAID 60

Stripes over RAID 6 sets. A performance increase over RAID 6 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
Disk errors
Dual disk failure per span
High read performance
Supports largest RAID group of 192 drives
Write performance decrease due to dual parity calculations
Extra cost due to 2 disk equivalent devoted to parity
Compare Products (0)
Hide

Add the products you would like to compare, and quickly determine which is best for your needs.

Compare
0
We’re here for you
Need help or looking to save more or get extra information about delivery? Contact your dedicated Tech Advisor