RAID 0 — Stripes data across the physical
disks. RAID 0 does not maintain redundant data. When a physical disk
fails in a RAID 0 virtual disk, there is no method for rebuilding
the data. RAID 0 offers good read and write performance with zero
data redundancy.
RAID 1 — Mirrors or duplicates data from
one physical disk to another. If a physical disk fails, data can be
rebuilt using the data from the other side of the mirror. RAID 1 offers
good read performance and average write performance with good data
redundancy.
RAID 5 — Stripes data across the physical
disks, and uses parity information to maintain redundant data. If
a physical disk fails, the data can be rebuilt using the parity information.
RAID 5 offers good read performance and slower write performance with
good data redundancy.
RAID 6 — Stripes data across the physical
disks, and uses two sets of parity information for additional data
redundancy. If one or two physical disks fail, the data can be rebuilt
using the parity information. RAID 6 offers good data redundancy and
read performance but slower write performance.
RAID 10 — Combines mirrored physical disks
with data striping. If a physical disk fails, data can be rebuilt
using the mirrored data. RAID 10 offers good read and write performance
with good data redundancy.
RAID 50 — A dual-level array that uses
multiple RAID 5 sets in a single array. A single physical disk failure
can occur in each of the RAID 5 without any loss of data on the entire
array. Although the RAID 50 has increased write performance, its performance
decreases, data or program access gets slower, and transfer speeds
on the array are affected when a physical disk fails and reconstruction
takes place.
RAID 60 — Combines the straight block
level striping of RAID 0 with the distributed double parity of RAID
6. The system must have at least eight physical disks to use RAID
60. Failures while a single physical disk is rebuilding in one RAID
60 set do not lead to data loss. RAID 60 has improved fault tolerance
because more than two physical disks on either span must fail for
data loss to occur.
NOTE: Depending on
the type of controllers, some RAID levels are not supported.
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