RAID stands for Redundant Array of Inexpensive (Independent) Disks.
These are some of the RAIDs which are mostly used.
RAID 1
RAID 5
RAID 10
RAID 0
- Blocks are stripped
- Excellent performance (Blocks stripped)
- No redundancy (No mirror no parity)
- Cannot be used for critical system
RAID 1
- Mirrored data to both drives
- Minimum 2 disks
- Good performance(No stripping no parity)
- Excellent redundancy(blocks mirrored)
RAID 5
- Minimum 3 disks.
- Good performance ( as blocks are striped ).
- Good redundancy ( distributed parity ).
- Best cost effective option providing both performance and redundancy. Best for DB that is heavily read oriented. Write operations will be slow.
RAID 10
- Minimum 4 disks.
- This is also called as “stripe of mirrors”
- Excellent redundancy ( as blocks are mirrored )
- Excellent performance ( as blocks are striped )
- If you can afford the dollar, this is the BEST option for any mission critical applications (especially databases).
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