RAID Flashcards
RAID 0
RAID-0 (striping) is somewhat of a misnomer because it doesn’t provide any redundancy or fault tolerance. It includes two or more physical disks. Files stored on a RAID-0 array are spread across each of the disks.
—used for CCTV or livestreaming, gaming, video editing
RAID 1
RAID-1 (mirroring) uses two disks. Data written to one disk is also written to the other disk.
If you have two 500 GB drives used in a RAID-1, you have 500 GB of usable storage space. The other 500 GB of storage space is dedicated to the fault-tolerant, mirrored volume.
–used with business files or critical system files
RAID 5
A RAID-5 is three or more disks that are striped together similar to RAID-0. However, the equivalent of one drive includes parity information that helps the drive provide fault tolerance.
If you have three 500 GB drives used in a RAID-5, you have 1000 GB of usable storage space. The other 500 GB of storage space is used for parity
–used in small to medium sized business for general purpose storage
RAID 6
Similar to RAID 5 but offers higher protection.
4 disks
striped
double parity
fault tolerant
Minimum of 4 disks
and continues to operate even if 2 of the drives fail.
–used in large scale storage systems enterprise-level databases, or systems handling sensitive data.
RAID 10
Combines both mirroring and striping. It requires a minimum of 4 disks and continues to operate even if 2 drives fail.
– It’s commonly implemented in servers or systems that require high-performance storage and fault tolerance. RAID 10 provides excellent read and write performance, as well as the ability to recover from multiple drive failures.
