At the beginning of a dump transaction, the SAP ASE server passes the primary device name of each logical log device to the Backup Server. If the primary device has been unmirrored, the SAP ASE server passes the name of the secondary device instead. If the named device fails before Backup Server completes its data transfer, the SAP ASE server aborts the dump.
If you attempt to unmirror a named log device while a dump transaction is in progress, the SAP ASE server displays a message. The user executing the disk unmirror command can abort the dump or defer the disk unmirror until after the dump completes.
dump transaction with truncate_only and dump transaction with no_log do not use the Backup Server. These commands are not affected when a log device is unmirrored, either by a device failure or by a disk unmirror command.
dump transaction copies only the log segment. It is not affected when a data-only device is unmirrored, either by a device failure or by a disk unmirror command.