2个通道中使用section size进行备份。
[oracle@rhel63single ~]$ rman target /
Recovery Manager: Release 11.2.0.4.0 - Production on Thu Feb 19 01:07:28 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: TEST (DBID=2106028980)
RMAN> RUN
2> {
3> ALLOCATE CHANNEL disk1 DEVICE TYPE DISK FORMAT '/u02/disk1/%U';
4> ALLOCATE CHANNEL disk2 DEVICE TYPE DISK FORMAT '/u02/disk2/%U';
5> backup section size 300m datafile 1;
6> }
released channel: ORA_DISK_1
allocated channel: disk1
channel disk1: SID=133 device type=DISK
allocated channel: disk2
channel disk2: SID=70 device type=DISK
Starting backup at 19-FEB-15
channel disk1: starting full datafile backup set
channel disk1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/test/system01.dbf---->system01.dbf
backing up blocks 1 through 38400-------------------------------------------------->注意此处
channel disk1: starting piece 1 at 19-FEB-15
channel disk2: starting full datafile backup set
channel disk2: specifying datafile(s) in backup set
including current control file in backup set--------------------------------------->控制文件的备份
channel disk2: starting piece 1 at 19-FEB-15
channel disk2: finished piece 1 at 19-FEB-15
piece handle=/u02/disk2/0bpvkm86_1_1 tag=TAG20150219T024005 comment=NONE----------->控制文件的备份生成完毕（从下面的list backup of controlfile看出来的）,不过仅仅根据上面的输出log来判断，还真判断不出来是控制文件的备份。
channel disk2: backup set complete, elapsed time: 00:00:07
channel disk2: starting full datafile backup set
channel disk2: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/test/system01.dbf
backing up blocks 38401 through 76800---------------------------------------------->
注意此处，以下简称第一个section
channel disk2: starting piece 2 at 19-FEB-15
channel disk1: finished piece 1 at 19-FEB-15
piece handle=/u02/disk1/0apvkm85_1_1 tag=TAG20150219T024005 comment=NONE----------->第一个section的backuppiece 生成完毕
channel disk1: backup set complete, elapsed time: 00:00:29
channel disk1: starting full datafile backup set
channel disk1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/test/system01.dbf
backing up blocks 76801 through 102400---------------------------------------------->注意此处，以下简称第二个section
channel disk1: starting piece 3 at 19-FEB-15
channel disk2: finished piece 2 at 19-FEB-15
piece handle=/u02/disk2/0apvkm85_2_1 tag=TAG20150219T024005 comment=NONE----------->第二个section的backuppiece 生成完毕
channel disk2: backup set complete, elapsed time: 00:00:47
channel disk2: starting full datafile backup set
channel disk2: specifying datafile(s) in backup set
including current SPFILE in backup set
channel disk2: starting piece 1 at 19-FEB-15
channel disk1: finished piece 3 at 19-FEB-15
piece handle=/u02/disk1/0apvkm85_3_1 tag=TAG20150219T024005 comment=NONE----------->第三个section的backuppiece 生成完毕
channel disk1: backup set complete, elapsed time: 00:00:35
channel disk2: finished piece 1 at 19-FEB-15
piece handle=/u02/disk2/0epvkmak_1_1 tag=TAG20150219T024005 comment=NONE-----------> spfile的备份（从下面的list backup of spfile看出来的）
channel disk2: backup set complete, elapsed time: 00:00:01
Finished backup at 19-FEB-15
released channel: disk1
released channel: d