问题原因：
在小型机P55A上安装了操作系统aix5.3，在进行alt_disk_install时，报了0516-082、0505-121的错误。
使用alt_disk_install时，系统报错
0516－082：/usr/sbin/lchangelv: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.
0505－121：alt_disk_install error
解决办法：
1.检查已经安装文件集bos.alt_disk_install.rte版本是否为5.3.0.40，如若不是，先请安装此版本文件集
2.在debug模式下重新运行alt_disk_install命令:
smit alt_install->Clone the rootvg to An Alternate Disk->Debug output?:yes
3.查看smit.log中ALT_MAJOR_NUM项对应的值
ALT_MAJOR_NUM=50
+ + odmget -q value1=50 CuDvDr
+ odmget -q value1=altinst_rootvg CuDvDr
CUDVDROUT=
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "0"
value3 = "altinst_rootvg"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "1"
value3 = "bootlv00"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "2"
value3 = "pagelv00"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "3"
value3 = "loglv00"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "4"
value3 = "fslv16"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "5"
value3 = "fslv17"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "6"
value3 = "fslv18"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "7"
value3 = "fslv19"
CuDvDr:
resource = "devno"
value1 = "50"
value2 = "8"
value3 = "fslv20"
......
......
......
由此看出ODM中有错误的项被记录了且未清除。
4.备份ODM
#odmget CuDvDr > /tmp/odm.out
#tar -cvf /tmp/odm.tar /etc/objrepos
#tar -cvf /tmp/odm-usr.tar /usr/lib/objrepos
5.找到Debug模式下,smit.log文件中的ALT_MAJOR_NUM对应的数字后,从CuDvDr中删除该条目
#odmget -q value1=50 CuDvDr ==> 22 instances
#odmdelete -q value1=50 -o CuDvDr ==>deleted 22 entries
6.查看CuAt,CuDv,CuDvDr,CuDep中对应条目是否仍然存在
#odmget CuAt | grep alt ==> 应该返回空
#odmget CuDv | grep alt ==> 列出 parent=altinst_rootvg项目
#odmget CuDvDr | grep alt ==> 应该返回空
#odmget CuDep | grep alt ==> 列出 name=altinst_rootvg项目
7.删除CuDv及CuDep中相关条目
#odmdelete -q parent=altinst_rootvg -o CuDv
#odmdelete -q name=altinst_rootvg -o CuDep
8.重新运行alt_disk_install,问题解决。
收起