Database require their storage media to be robust and resilient to failure. It is vital to protect against hardware and disk failures and to maximize performance using all the available hardware resources. Using volume manager provides this necessary resilience and eases the task of management. A volume manager can help us manage hundreds of disk device and makes spanning, striping, and mirroring easy.
Veritas Volume Manager (VxVM) builds virtual devices called volumes on top of physical disks. Volumes are accessed by a file system, a database, or other applications in the same way physical disk partitions would be accessed.
How Mirroring (RAID-1) Works
Mirroring is a technique of using multiple copies of the data, or mirrors, to duplicate the information contained in a volume. In the event of a physical disk failure, the mirror on the failed disk becomes unavailable, but the system continues to operate using the unaffected mirrors. For this reason, mirroring increase system reliability and availability. A volume requires at least two mirrors to provide redundancy of data. A volume can consist of up to 32 mirrors. Each of these mirrors must contain disk space from different disks for the redundancy to be effective.
Veritas Volume Manager (VxVM) builds virtual devices called volumes on top of physical disks. Volumes are accessed by a file system, a database, or other applications in the same way physical disk partitions would be accessed.
How Mirroring (RAID-1) Works
Mirroring is a technique of using multiple copies of the data, or mirrors, to duplicate the information contained in a volume. In the event of a physical disk failure, the mirror on the failed disk becomes unavailable, but the system continues to operate using the unaffected mirrors. For this reason, mirroring increase system reliability and availability. A volume requires at least two mirrors to provide redundancy of data. A volume can consist of up to 32 mirrors. Each of these mirrors must contain disk space from different disks for the redundancy to be effective.