Migrate DATA ASM Diskgroup To Another Storage

If necessary, modify asm_diskstring.

alter system set asm_diskstring = '/dev/emcpowerc*','/dev/emcpowerh*' scope=both;

select name,path from v$asm_disk;

Query the fail groups.

col path for a20
col state for a10
col failgroup for a15
col name for a15
select dg.name,dg.state,dg.type,d.disk_number,d.path,d.mount_status,d.failgroup,d.name,d.state 
from v$asm_diskgroup dg, v$asm_disk d
where dg.group_number=d.group_number and dg.name='DATA'
order by dg.name,d.disk_number;

NAME            STATE      TYPE   DISK_NUMBER PATH                 MOUNT_S FAILGROUP       NAME            STATE
--------------- ---------- ------ ----------- -------------------- ------- --------------- --------------- ----------
DATA            MOUNTED    EXTERN           0 ORCL:DATA1           CACHED  DATA1           DATA1           NORMAL
DATA            MOUNTED    EXTERN           1 ORCL:DATA2           CACHED  DATA2           DATA2           NORMAL
DATA            MOUNTED    EXTERN           2 ORCL:DATA3           CACHED  DATA3           DATA3           NORMAL

Create new disks.

~]# oracleasm createdisk NEW_DATA1 /dev/sdl1
Writing disk header: done
Instantiating disk: done
~]# oracleasm createdisk NEW_DATA2 /dev/sdm1
Writing disk header: done
Instantiating disk: done
~]# oracleasm createdisk NEW_DATA3 /dev/sdn1
Writing disk header: done
Instantiating disk: done

~]# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
Instantiating disk "NEW_DATA1"
Instantiating disk "NEW_DATA2"
Instantiating disk "NEW_DATA3"

From node1 add each disk to a fail group.

sqlplus " / as sysasm"

-- external type not need to specify a fail group
ALTER DISKGROUP DATA ADD DISK
'ORCL:NEW_DATA1',
'ORCL:NEW_DATA2',
'ORCL:NEW_DATA3'
REBALANCE POWER 8;

-- chanage rebalance power. compatiable.asm >= 11.2.0.2, power range is 0 to 1024; if < 11.2.0.2, power range is 0 to 11.
alter diskgroup DATA rebalance power 8;

Check gv$asm_operation till it returns no rows.

SQL> select * from gv$asm_operation;
no rows selected

SQL> col path for a20
col state for a10
col failgroup for a15
col name for a15
select dg.name,dg.state,dg.type,d.disk_number,d.path,d.mount_status,d.failgroup,d.name,d.state
from v$asm_diskgroup dg, v$asm_disk d
where dg.group_number=d.group_number and dg.name='DATA'
order by dg.name,d.disk_number;

NAME            STATE      TYPE   DISK_NUMBER PATH                 MOUNT_S FAILGROUP       NAME            STATE
--------------- ---------- ------ ----------- -------------------- ------- --------------- --------------- ----------
DATA            MOUNTED    EXTERN           0 ORCL:DATA1           CACHED  DATA1           DATA1           NORMAL
DATA            MOUNTED    EXTERN           1 ORCL:DATA2           CACHED  DATA2           DATA2           NORMAL
DATA            MOUNTED    EXTERN           2 ORCL:DATA3           CACHED  DATA3           DATA3           NORMAL
DATA            MOUNTED    EXTERN           3 ORCL:NEW_DATA1       CACHED  NEW_DATA1       NEW_DATA1       NORMAL
DATA            MOUNTED    EXTERN           4 ORCL:NEW_DATA2       CACHED  NEW_DATA2       NEW_DATA2       NORMAL
DATA            MOUNTED    EXTERN           5 ORCL:NEW_DATA3       CACHED  NEW_DATA3       NEW_DATA3       NORMAL

Drop old disks.

ALTER DISKGROUP DATA DROP DISK
'DATA1',
'DATA2',
'DATA3'
REBALANCE POWER 8;

Check gv$asm_operation till it returns no rows.

SQL> select * from gv$asm_operation;
no rows selected

SQL> col path for a20
col state for a10
col failgroup for a15
col name for a15
select dg.name,dg.state,dg.type,d.disk_number,d.path,d.mount_status,d.failgroup,d.name,d.state
from v$asm_diskgroup dg, v$asm_disk d
where dg.group_number=d.group_number and dg.name='DATA'
order by dg.name,d.disk_number;

NAME            STATE      TYPE   DISK_NUMBER PATH                 MOUNT_S FAILGROUP       NAME            STATE
--------------- ---------- ------ ----------- -------------------- ------- --------------- --------------- ----------
DATA            MOUNTED    EXTERN           3 ORCL:NEW_DATA1       CACHED  NEW_DATA1       NEW_DATA1       NORMAL
DATA            MOUNTED    EXTERN           4 ORCL:NEW_DATA2       CACHED  NEW_DATA2       NEW_DATA2       NORMAL
DATA            MOUNTED    EXTERN           5 ORCL:NEW_DATA3       CACHED  NEW_DATA3       NEW_DATA3       NORMAL

Note: add and drop disks in one command, only one rebalancing operation will occur.

ALTER DISKGROUP DATA ADD DISK
'ORCL:NEW_DATA1',
'ORCL:NEW_DATA2',
'ORCL:NEW_DATA3'
DROP DISK
'DATA1',
'DATA2',
'DATA3'
REBALANCE POWER 8;

Delete old disks.

~]# oracleasm deletedisk DATA1
Clearing disk header: done
Dropping disk: done
~]# oracleasm deletedisk DATA2
Clearing disk header: done
Dropping disk: done
~]# oracleasm deletedisk DATA3
Clearing disk header: done
Dropping disk: done

~]# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Cleaning disk "DATA1"
Cleaning disk "DATA2"
Cleaning disk "DATA3"
Scanning system for ASM disks...