RAID for Redundant Array of Inexpensive Disks. Raid is mainly used to backup volumes or partitions on multiple physical disks. Raid can be implemented with different technologies like a soft raid or hard raid.
What Is Soft RAID?
Soft raid is implemented on operating system level and requires some tools and modules. Below is a tutorial about mdadm which is Linux software used to implement soft RAID.
What Is RAID?
Raid is generally implemented in hardware level in enterprise environments which makes created RAID more reliable.
RAID LEVEL 0
- Minimum 2 disks
- Performance because blocks are stripped
- More disk more performance
- No redundancy
- Do not use for critical systems
RAID LEVEL 1
- Minimum 2 disks
- No performance gain because there is no striping or parity
- Excellent redundancy because of two disks with same data
RAID LEVEL 5
- Minimum 3 disks
- Good performance because blocks are stripped
- Good redundancy because one disk is used for parity
- Good cost because provides performance and redundancy with 3 disks
RAID LEVEL 10 or 1+0
- Minimum 4 disks
- Called
stripe of mirrors - Both RAID 1 and RAID 0 is chained together
- Excellent redundancy
- Excellent performance
- The best solution for mission-critical systems if the cost is not so important
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