Hi, Yong We can notice it's channel ORA_AUX_DISK_1 raised the error, It means the new instance davidh cannot access the ASM instance. Would you please run command as below: $ export ORACLE_SID=+ASM2 SQL> select DB_NAME,INSTANCE_NAME,STATUS from V$ASM_CLIENT; $ export ORACLE_SID=davidh SQL> select GROUP_NUMBER,NAME,STATE from v$asm_diskgroup; Check if "davidh" DB_NAME is in ASM client and status is "CONNECTED"? -- Kamus <kamusis@xxxxxxxxx> Visit my blog for more : http://www.dbform.com Join ACOUG: http://www.acoug.org On Sun, Dec 12, 2010 at 6:41 AM, Yong Huang <yong321@xxxxxxxxx> wrote: > channel ORA_AUX_DISK_1 -- //www.freelists.org/webpage/oracle-l