RAID 1, also known as "mirroring," is the most widely implemented level of RAID. It allows you to maintain two copies of backup data. One copy is typically maintained at the backup location and the other is located safely off site. It combines two physical disks into a single array. Data is written to or read from both drives at the same time. RAID 1 provides fault tolerance and reliability, by allowing you to maintain two copies of backup data: one that is typically maintained at the backup location and the duplicate or mirrored copy located safely at another site. You can use this RAID level to transport your data easily without performing a media copy operation.
In the mirroring mode, the operations of the drives are duplicated. Whenever data is written to one drive, the same data is also written to the redundant drive, so there are always two copies of the data. The redundant drive ensures that the backup is completed, even if a drive or media fails. In case of drive failure, the backup or restore continues with the remaining drive.
Note: RAID 1 is also referred to as disk mirroring or duplexing. Mirroring uses one channel and duplexing uses two channels.
In non-RAID mode functions, the media sets used in mirroring are compatible with Arcserve Backup. You can use Arcserve Backup in this mode to restore data from either of the RAID drives, but a session appended in non-RAID mode makes the media unusable in RAID mode. If the media needs to be used again, it must first be erased or reformatted.
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