按照下面的步骤操作能够建立系统备份（mksysb)而不保留镜像信息：
1.运行如下命令建立一个新的image.data文件：
mkszfile
2.进入到根（/）目录下编辑image.data文件
3. cd /
4. vi image.data
5.下面的例子显示出一个image.data文件的逻辑卷数据（lv_data）的一部分，第一个例子是带有镜像信息，而第二例子是不带镜像信息
的编辑过的版本。改变了的行被用 -->符号标示出并用了粗体显示，想要查看和编辑这个文件，输入如下命令：
                  vi image.data
          Example 1
                     lv_data:
                             VOLUME_GROUP= rootvg
                             LV_SOURCE_DISK_LIST= hdisk0
                             LV_IDENTIFIER= 00000001113f3c62.5
                             LOGICAL_VOLUME= hd2
                             VG_STAT= active/complete
                             TYPE= jfs
                             MAX_LPS= 512
                  -->        COPIES = 2
                             LPs = 70
                             STALE_PPs= 0
                             INTER_POLICY= minimum
                             INTRA_POLICY= center
                             MOUNT_POINT= /usr
                              MIRROR_WRITE_CONSISTENCY= on
                             LV_SEPARATE_PV= yes
                             PERMISSION= read/write
                             LV_STATE= opened/syncd
                             WRITE_VERIFY= off
                             PP_SIZE= 4
                             SCHED_POLICY= parallel
                  -->        PP = 140
                             BB_POLICY= relocatable
                             RELOCATABLE= yes
                             UPPER_BOUND= 32
                             LABEL= /usr
                             MAPFILE=
                             LV_MIN_LPS= 68
   Example 2
                     lv_data:
                             VOLUME_GROUP= rootvg
                             LV_SOURCE_DISK_LIST= hdisk0
                             LV_IDENTIFIER= 00000001113f3c62.5
                             LOGICAL_VOLUME= hd2
                             VG_STAT= active/complete
                             TYPE= jfs
                              MAX_LPS= 512
                   -->        COPIES = 1
                             LPs = 70
                             STALE_PPs= 0
                             INTER_POLICY= minimum
                             INTRA_POLICY= center
                             MOUNT_POINT= /usr
                             MIRROR_WRITE_CONSISTENCY= on
                             LV_SEPARATE_PV= yes
                             PERMISSION= read/write
                             LV_STATE= opened/syncd
                             WRITE_VERIFY= off
                             PP_SIZE= 4
                             SCHED_POLICY= parallel
                  -->        PP = 70
                             BB_POLICY= relocatable
                             RELOCATABLE= yes
                             UPPER_BOUND= 32
                             LABEL= /usr
                             MAPFILE=
                             LV_MIN_LPS= 68

在例子2（Example 2)里COPIES值被改成了1并且PP值被调整等于LPs值，对image.data文件里任何逻辑卷数据（lv_data)
相应部分都要做如此改变。改变完成后保存退出。
6.在命令行运行mksysb命令将利用你编辑过的image.data文件进行系统备份：
mksysb /dev/rmtX (X代表所使用的磁带机设备号）

警告：
1.不要在smit菜单里运行mksysb,因为这样做将更新image.data文件并重写已经做过的任何改变；
2.运行mksysb命令时千万不要加 -i 参数,因为这样做同样会更新image.data文件.