周四和周五，把一套系统的数据库从HITACHI9970V的存储中迁移到了原IBM7133的存储中，大概的过程如下，这套系统主机是2台IBM的S7A小型机，做了HA，使用ORACLE的OPS，使用了也快10年了，7133的存储也停了2年没使用，而且设备都过保了，做前担心别做着做着就启不来了，呵呵。
首先在9970V连接情况下，做了个全库导出，确认成功后，准备进行HA配置的修改，

1、导出导入VG信息
smitty vg --export vg[9970V上的VG]
            import vg[7133上的VG]

2、修改VG配置

                                             Change a Volume Group

Type or select values in entry fields.
Press Enter AFTER making all desired changes.
 
                                                        [Entry Fields]
* VOLUME GROUP name                                   datavg1
* Activate volume group AUTOMATICALLY                 no                                                     +
    at system restart?
* A QUORUM of disks required to keep the volume       no                                                     +
   group on-line ?
  Convert this VG to Concurrent Capable?              no                                                     +
* Autovaryon VG in Concurrent Mode?                   no                                                     +
  把前2项从YES改为NO，否则OPS的2端无法同时启动HA。或者使用命令chvg -an datavg1

3、修改HA配置
smitty hacmp--
  Cluster Configuration--
      Cluster Resources -- 
          Change/Show Resources for a Resource Group 

                                   Configure Resources for a Resource Group

Type or select values in entry fields.
Press Enter AFTER making all desired changes.
 
                                                        [Entry Fields]
  Resource Group Name                                 DB_res
  Node Relationship                                   concurrent
  Participating Node Names                            DB_S7A1 DB_S7A2
 
  Service IP label                                   []                                                      +
  Filesystems                                        []                                                      +
  Filesystems Consistency Check                       fsck                                                   +
  Filesystems Recovery Method                         sequential                                             +
  Filesystems to Export                              []                                                      +
  Filesystems to NFS mount                           []                                                      +
  Volume Groups                                      []                                                      +
  Concurrent Volume groups                           [datavg1]                                               +
  Raw Disk PVIDs                                     []                                                      +
  AIX Connections Services                           []                                                      +
  AIX Fast Connect Services                          []                                                      +
  Application Servers                                [DB_APP]                                                +
  Highly Available Communication Links               []                                                      +
  Miscellaneous Data                                 []
将Concurrent Volume groups 后面的VG从9970V上的VG修改为7133上的VG。2台主机都要修改。

这样2台机器就可以同时启动HA了，使用的存储就不再是9970V，而是7133。


4、导入数据
由于导出的数据是在管道下导出同时压缩的，2台主机上都没这么大的空间来一次解压这么大的数据文件，也只好再用管道解压来导入，
uncompress </orabackup/dbexpallw4.dmp.Z  > /orabackup/dbpipe &
sleep 5
imp userid=username/passwd file='/orabackup/dbpipe'  log=log4.log buffer=5000000  fromuser=user1 touser=user1 commit=y ignore=y feedback=100000
再导入前，还先执行回收RBS的命令，如下：
sqlplus user1/passwd<<!
ALTER ROLLBACK SEGMENT R21 SHRINK;
ALTER ROLLBACK SEGMENT R22 SHRINK;
ALTER ROLLBACK SEGMENT R23 SHRINK;
ALTER ROLLBACK SEGMENT R24 SHRINK;
ALTER ROLLBACK SEGMENT R25 SHRINK;
ALTER ROLLBACK SEGMENT R26 SHRINK;
ALTER ROLLBACK SEGMENT R27 SHRINK;
ALTER ROLLBACK SEGMENT R28 SHRINK;
ALTER ROLLBACK SEGMENT R29 SHRINK;
ALTER ROLLBACK SEGMENT R30 SHRINK;
ALTER ROLLBACK SEGMENT R31 SHRINK;
ALTER ROLLBACK SEGMENT R32 SHRINK;
ALTER ROLLBACK SEGMENT R33 SHRINK;
ALTER ROLLBACK SEGMENT R34 SHRINK;
ALTER ROLLBACK SEGMENT R35 SHRINK;
ALTER ROLLBACK SEGMENT R36 SHRINK;
ALTER ROLLBACK SEGMENT R37 SHRINK;
ALTER ROLLBACK SEGMENT R38 SHRINK;
ALTER ROLLBACK SEGMENT R39 SHRINK;
ALTER ROLLBACK SEGMENT R40 SHRINK;
ALTER ROLLBACK SEGMENT R21 SHRINK;
ALTER ROLLBACK SEGMENT R22 SHRINK;
ALTER ROLLBACK SEGMENT R101 SHRINK;
导入过程6个小时，顺利完成。