Disk mirroring can provide nonstop recovery in the event of media failure. The disk mirror command causes an Adaptive Server database device to be duplicated, that is, all writes to the device are copied to a separate physical device. If one device fails, the other contains an up-to-date copy of all transactions.
When a read or write to a mirrored device fails, Adaptive Server “unmirrors” the bad device and displays error messages. Adaptive Server continues to run unmirrored.
