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RAID 5

Index | Features | RAID 0 | RAID 1 | RAID 1+0 | RAID 2 | RAID 3 | RAID 4 | RAID 5 | RAID 5+0 | RAID 6 |


RAID 5 is the most popular RAID technology in use today. It uses a technique that avoids the concentration of I/O on a dedicated parity disk, that occurs with RAID 4.
Although RAID 5 divides the data and creates parity information similar to RAID 4, unlike RAID 4 the parity data is written separately across multiple disks.

"Write penalty" still occurs as existing data must be pre-read before update and parity data has to be updated after the data is written.

However, RAID 5 enables multiple write orders to be implemented concurrently because updated parity data is dispersed across the multiple disks. This feature ensures higher performance compared with RAID 4.

Furthermore, some ETERNUS AF and ETERNUS DX are able to deploy disk drives where RAID6 and 5 arrays are deployed across separate drive enclosures (DE) for improved reliability. (Learn more)

Flash demonstrations

RAID 5 supported:

All-Flash Arrays ETERNUS AF250 S2/AF250
ETERNUS AF650 S2/AF650
ETERNUS DX200F
Hybrid Storage Systems/
Disk Storage Systems
ETERNUS DX60 S4/S3
ETERNUS DX100 S4/S3, DX200 S4/S3
ETERNUS DX500 S4/S3, DX600 S4/S3
ETERNUS DX8700 S3/S2, DX8900 S4/S3
ETERNUS DX60 S2/DX60
ETERNUS DX80 S2/DX80
ETERNUS DX90 S2/DX90
ETERNUS DX400 S2/DX400 series
ETERNUS DX8000 series
ETERNUS2000, ETERNUS4000, ETERNUS8000