Applications running on the system are unaware that disk mirroring is present. 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. Once mirrored disks have been installed, you can use them like any other disks connected to the system. Additionally, you can perform split-volume backup of mirrored disk data while still accessing the data.
Users continue to access data if either disk of any pair is disabled or under repair.
System detects failed drive, continues to run application, and discontinues mirroring until drive is repaired. Install the disk hardware. Boot the system with the new configuration. Move files, if necessary. Set up accounts and groups.