What are mirrored disks?

Mirrored disks are designed to provide high data availability by automatically maintaining identical information on two partner disks. When an application writes to a disk, disk mirroring causes the information to be written to both drive partners. Applications running on the system are unaware that disk mirroring is present.

Once disk mirroring has been installed using the VOLUTIL utility, a mirrored disk acts just like any other disk connected to the system, until a disk failure occurs. If either disk of any pair fails, normal system operation continues. When the partner is ready to resume operation, the system copies data from the good disk, bringing the pair to a consistent state, and normal mirroring resumes. Refer to Figure 1-1 “Mirrored Disks”.

Figure 1-1 Mirrored Disks