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What is RAID 1?

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