MSI K8N NEO4-F User Guide - Page 115

RAID 5 Parity RAID, JBOD Just Bunch of Disks

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Silicon Image SATARAID5TM Introduction The data is written to RAID Group A, which is striped (RAID 0). This allows maximum speed. The data is then mirrored to another RAID 0 striped set, which is Set B in the figure above. This provides data redundancy (RAID 1), and thus increased data security. Under certain circumstances, a RAID 10 set can sustain multiple simultaneous drive failures. RAID 5 (Parity RAID) Parity or RAID 5 adds fault tolerance to Disk Striping by including parity information with the data. Parity RAID dedicates the equivalent of one disk for storing parity stripes. The data and parity information is arranged on the disk array so that parity is written to different disks. There are at least 3 members to a Parity RAID set. The following example illustrates how the parity is rotated from disk to disk. Parity RAID uses less capacity for protection and is the preferred method to reduce the cost per megabyte for larger installations. Mirroring requires 100% increase in capacity to protect the data whereas the above example only requires a 50% increase. The required capacity decreases as the number of disks in the group increases. JBOD (Just Bunch of Disks) The JBOD is a virtual disk that can either be an entire disk drive or a segment of a single disk drive. For home edition, JBOD function only supports one disk. 6-3

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6-3
Silicon Image SATARAID5
TM
Introduction
The data is written to RAID Group A, which is striped (RAID 0). This allows
maximum speed. The data is then mirrored to another RAID 0 striped set, which is
Set B in the figure above. This provides data redundancy (RAID 1), and thus
increased data security. Under certain circumstances, a RAID 10 set can sustain
multiple simultaneous drive failures.
RAID 5 (Parity RAID)
Parity or RAID 5 adds fault tolerance to Disk Striping by including parity information
with the data. Parity RAID dedicates the equivalent of one disk for storing parity
stripes. The data and parity information is arranged on the disk array so that parity
is written to different disks. There are at least 3 members to a Parity RAID set. The
following example illustrates how the parity is rotated from disk to disk.
Parity RAID uses less capacity for protection and is the preferred method to
reduce the cost per megabyte for larger installations. Mirroring requires 100%
increase in capacity to protect the data whereas the above example only requires
a 50% increase. The required capacity decreases as the number of disks in the
group increases.
JBOD (Just Bunch of Disks)
The JBOD is a virtual disk that can either be an entire disk drive or a segment of a
single disk drive. For home edition, JBOD function only supports one disk.