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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:

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