BACKUP_DISK_IO_SLAVES：Number of I/O slaves used by the Recovery Manager to backup, copy, or restore. Note that every Recovery Manager channel can get the specified number of I/O slave processes. By default, the value is 0 and I/O slaves are not used. Typically I/O slaves are used to "simulate" asynchronous I/O on platforms that either do not support asynchronous I/O or implement it inefficiently. However, I/O slaves can be used even when asynchronous I/O is being used. In that case the I/O slaves will use asynchronous I/O. Obsolete in 8.1.3. Version: 8.0 Default Value: 0 Range of Values: 0 - 15; 7 or lower is recommended
错误码
错误描述：Number of I/O slaves used by the Recovery Manager to backup, copy, or restore. Note that every Recovery Manager channel can get the specified number of I/O slave processes. By default, the value is 0 and I/O slaves are not used.
Typically I/O slaves are used to "simulate" asynchronous I/O on platforms that either do not support asynchronous I/O or implement it inefficiently. However, I/O slaves can be used even when asynchronous I/O is being used. In that case the I/O slaves will use asynchronous I/O. Obsolete in 8.1.3.
Version: 8.0
Default Value: 0
Range of Values: 0 - 15; 7 or lower is recommended
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