RAID 1 - Disk mirroring. Optimized for Redundancy

RAID 1 uses mirroring to write data to multiple drives. This means that when you write a file, the file is actually written to two disks. If one of the disks fails, you simply replace it and rebuild the mirror.

The tradeoff with RAID 1 is cost. With RAID 1, you must purchase double the amount of storage space that your data requires.

• Minimum number of drives: 2
• Strengths: Very high performance; Very high data protection; Very minimal penalty on write performance.
• Weaknesses: High redundancy cost overhead; Because all data is duplicated, twice the storage capacity is required.

Mirroring Standard Host Adapter DRIVE 1 DRIVE 2 Data A Data A Data B Data B Data C Data C Original Data Mirrored Data

Duplexing Standard Host Adapter 1 Standard Host Adapter 2 DRIVE 1 DRIVE 2 Data A Data A Data B Data B Data C Data C Original Data Mirrored Data

RAID Levels instruction: RAID 0 - RAID 1 - RAID 2 - RAID 3 - RAID 4 - RAID 5 - RAID 0/1 (or RAID 10)

Types Of RAID: Hardware-based Raid | Software-based Raid