RAID stands for Redundant Arrayof Independent Disks.
With RAID enabled on a storage system, you can connect two or more drives within the system so that they all function as one fast, large-capacity drive or organize multiple drives as one system drive used to automatically duplicate (or mirror) your data for real-time backups.
RAID 0 – PERFORMANCE
RAID 0 mode allows disk spreading across all drives in a RAID drive group.
RAID 0 does not provide data redundancy but provides the best performance of the existing RAID levels.
RAID 0 breaks data into smaller segments and spreads the data segments across each drive in the drive group.
RAID 1 – DATA PROTECTION
Makes the system work in data protection mode (also known as mirror mode or RAID 1) and the capacity is split in half.
Half the capacity is used to store your data and half is used for the duplicate copy.
If one drive fails, your data is protected because it has been duplicated.’
RAID 5 – DATA PROTECTION AND SPEED
In systems with three or four drives, we recommend that you set the system to RAID 5.
This gives you the best of both worlds: fast performance by spreading data across all drives; data protection by dedicating a quarter of each drive in a four-drive system to fault tolerance and leaving three-quarters of the system capacity for data storage.
RAID 10 – HIGH RELIABILITY AND PERFORMANCE
RAID 10 or RAID 1+0 provides very high I/O rates by spreading RAID 1 (mirrored) segments.
These RAID modes are great for business-critical database management solutions that require maximum performance and high fault tolerance.
Systems set to RAID 10 deliver half the total capacity of all drives in the array.
JBOD & SPANNING
JBOD is the use of one or more drives that are not in a RAID configuration but are managed as separate logical volumes.
Spanning is the linear combination of drives to form one large logical volume.
The advantage of using this mode is that you can add more drives without having to reformat the system.
