RAID Levels
total 10 types of RAID levels:
- RAID level 0
- RAID level RAID level 1
- RAID level 2
- RAID level 3
- RAID level 4
- RAID level 5
- RAID level 6
- RAID level 10
- RAID level 50
- RAID level 0+1
Following RAID levels are commonly used :
RAID-0 stores the data evenly into multiple disks,
Fault tolerance is not available, so does not provide data redundancy, if just one disk is crashes the data will be lost.
“Read and Write” speed is fast. So it provides great performance of data access.
- Maximum of 32 Hard Disks
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| RAID 0 |
RAID 1: (mirroring without parity or striping)
RAID-1 stores the date simultaneously into two different disks.
It provides great security for your data with fault tolerance, if one disk is destroyed, a copy of its contents is located on another disk.
Read speed is fast and Writes speed is slow so it provides good performance of data access.
- Minimum & Maximum 2 Hard Disks
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| RAID 1 |
RAID 5: (block-level striping with distributed parity)
Data stores alternately and evenly to all disks and parity also writes in all drives along with data.
Fault Tolerance is available; Array is not destroyed by a single drive failure.
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| RAID 5 |
W ith RAID 5 can only survive the loss of a single disk; no more than one hard disk can fail at the same time. If one is destroyed, it must be replaced as soon as possible to save the data.
- Minimum of 3 Hard Disks
- Maximum of 32 Hard Disks
- Read & Write Speed is Fast
RAID 6 (block-level striping with double distributed parity)
It provides fault tolerance up to two failed drives. This makes larger RAID groups more practical, especially for high-availability systems.
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| RAID 6 |
T his becomes increasingly important as large-capacity drives lengthen the time needed to recover from the failure of a single drive. Like RAID 5, a single drive failure results in reduced performance of the entire array until the failed drive has been replaced and the associated data rebuilt.
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