RAID Levels - RAID 4 - RAID LEVEL 4: Independent Data Disks With Shared Parity Disk

RAID LEVEL 4: Independent Data Disks with Shared Parity Disk

Each entire block is written onto a data disk. Parity for same rank blocks is generated on Writes, recorded on the parity disk and checked on Reads.

RAID Level 4 requires a minimum of 3 drives to implement

Recommended Products

JetStor SAS 724FD
JetStor SAS 724U
JetStor SAS 716iSD

Featured Product

JetStor SAS 724FD

Characteristics & Advantages

Very high Read data transaction rate
Low ratio of ECC (Parity) disks to data disks means high efficiency
High aggregate Read transfer rate

Disadvantages

Quite complex controller design
Worst Write transaction rate and Write aggregate transfer rate
Difficult and inefficient data rebuild in the event of disk failure
Block Read transfer rate equal to that of a single disk