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24 | Chapter 4: Useful Help
Data are stored twice by writing them to both the data disk
(or set of data disks) and a mirror disk (or set of disks) . If
a disk fails, the controller uses either the data drive or the
mirror drive for data recovery and continues operation. You
need at least 2 disks for a RAID 1 array.
Features and Benefits
• Drives: Minimum 2, and maximum is 2.
• Uses: RAID 1 is ideal for small databases or any other application that requires fault
tolerance and minimal capacity.
• Benefits: Provides 100% data redundancy. Should one drive fail, the controller switches
to the other drive.
• Drawbacks: Requires 2 drives for the storage space of one drive. Performance is impaired
during drive rebuilds.
• Fault Tolerance: Yes.
RAID 10 combines the advantages (and
disadvantages) of RAID 0 and RAID 1 in one
single system. It provides security by mirroring
all data on a secondary set of disks (disk 3 and
4 in the drawing below) while using striping
across each set of disks to speed up data
transfers.
Features and Benefits
• Drives: Minimum 4, and maximum is 6 or 8, depending on the platform.
• Benefits: Optimizes for both fault tolerance and performance, allowing for automatic
redundancy. May be simultaneously used with other RAID levels in an array, and allows
for spare disks.
• Drawbacks: Requires twice the available disk space for data redundancy, the same as
RAID level 1.
• Fault Tolerance: Yes.