Mirroring Database Devices

Disk mirroring can provide nonstop recovery in the event of media failure.

The disk mirror command duplicates an SAP ASE database device, 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, SAP ASE “unmirrors” the bad device and displays error messages. SAP ASE continues to run unmirrored.