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RAID 1

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


This level is called "mirroring" as it copies data onto two disk drives simultaneously.
Although there is no enhancement in access speeds, the automatic duplication of the data means there is little likelihood of data loss or system downtime.

RAID 1 provides failure tolerance. If one disk fails the other automatically takes over and continuous operation is maintained.

There is no storage cost performance improvement as duplicating all data means only half the total disk capacity is able for storage.

Flash demonstrations

RAID 1 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