沒想到這么簡單的操作，由于不熟悉還碰到了兩個小問題。

[oracle@dbserver1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Tue Aug 9 10:08:06

2011

Copyright (c) 1982, 2010, Oracle.All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

With the Partitioning, Automatic Storage Management, OLAP, Data Mining

and Real Application Testing options

SQL> set pages 100 lines 120

SQL> select group_number, name, state, type, total_mb, free_mb

2from v$asm_diskgroup;

GROUP_NUMBER NAMESTATETYPETOTAL_MBFREE_MB

------------ ------------------------------ ----------- ------ ----------

----------

1 DATA_AU1MCONNECTEDEXTERN19531247430

2 DATA_AU2MCONNECTEDEXTERN19531247384

3 DATA_AU4MCONNECTEDEXTERN19531247304

4 DATACONNECTEDEXTERN39062483898966

SQL> col path format a30

SQL> col name format a30

SQL> select disk_number, path, name, total_mb, free_mb

2from v$asm_disk

3where group_number = 4;

DISK_NUMBER PATHNAMETOTAL_MBFREE_MB

----------- ------------------------- ------------------------- ----------

----------

1 /dev/asm-disk5DATA_000119531241949486

0 /dev/asm-disk4DATA_000019531241949480

SQL> alter diskgroup data drop disk '/dev/asm-disk5';

alter diskgroup data drop disk '/dev/asm-disk5'

*

ERROR at line 1:

ORA-15000: command disallowed by current instance type

SQL> exit

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 -

64bit Production

With the Partitioning, Automatic Storage Management, OLAP, Data Mining

and Real Application Testing options

由于當前連接的是數據庫，顯然不能對ASM實例中的磁盤組進行操作，下面連接ASM實例：

[oracle@dbserver1 ~]$ su - grid

Password:

[grid@dbserver1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.2.0

Production on Tue Aug 9 10:12:39 2011

Copyright (c) 1982, 2010, Oracle.

All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

With the Automatic Storage Management option

SQL> set pages 100 lines 120

SQL> select instance_number, instance_name from v$instance;

INSTANCE_NUMBER INSTANCE_NAME

--------------- ----------------

1 +ASM

SQL> alter diskgroup data drop

disk '/dev/asm-disk5';

alter diskgroup data drop disk '/dev/asm-disk5'

*

ERROR at line 1:

ORA-15032: not all alterations performed

ORA-15260: permission denied on ASM disk group

SQL> alter diskgroup data drop disk data_0001;

alter diskgroup data drop disk data_0001

*

ERROR at line 1:

ORA-15032: not all alterations performed

ORA-15260: permission denied on ASM disk group

開始看到這個錯誤還確實疑惑了一下，怎么可能沒有權限。有在操作系統上檢查了磁盤的權限，也沒有任何問題。

檢查Oracle文檔的錯誤信息后發現，由于習慣了適用sysdba來處理，忽略了當前是11g的ASM，應該用sysasm來登錄：

SQL> conn / as sysasm

Connected.

SQL> alter diskgroup data drop disk data_0001;

Diskgroup altered.

SQL> select disk_number, state, name, total_mb, free_mb from

v$asm_disk where group_number = 4;

DISK_NUMBER STATE NAMETOTAL_MBFREE_MB

----------- -------- ------------------------------ ---------- ----------

1 DROPPING DATA_000119531241950842

0 NORMALDATA_000019531241948124

SQL> select disk_number, state, name, total_mb, free_mb from

v$asm_disk where group_number = 4;

DISK_NUMBER STATENAMETOTAL_MBFREE_MB

----------- -------- ------------------------------ ---------- ----------

1 DROPPING DATA_000119531241951434

0 NORMALDATA_000019531241947532

SQL> select disk_number, state, name, total_mb, free_mb from

v$asm_disk where group_number = 4;

DISK_NUMBER STATENAMETOTAL_MBFREE_MB

----------- -------- ------------------------------ ---------- ----------

1 DROPPING DATA_000119531241952556

0 NORMALDATA_000019531241946410

SQL> select disk_number, state, name, total_mb, free_mb from

v$asm_disk where group_number = 4;

DISK_NUMBER STATENAMETOTAL_MBFREE_MB

----------- -------- ------------------------------ ---------- ----------

1 DROPPING DATA_000119531241953096

0 NORMALDATA_000019531241945870

SQL> select disk_number, state, name, total_mb, free_mb from

v$asm_disk where group_number = 4;

DISK_NUMBER STATENAMETOTAL_MBFREE_MB

----------- -------- ------------------------------ ---------- ----------

0 NORMALDATA_000019531241945854

SQL> select group_number, disk_number, path, name, state,

total_mb, free_mb

2from v$asm_disk

3where path = '/dev/asm-disk5';

GROUP_NUMBER DISK_NUMBER PATHNAMESTATETOTAL_MBFREE_MB

------------ ----------- --------------- ---------- -------- ----------

----------

01 /dev/asm-disk5NORMAL00

可以看到，雖然刪除操作執行完成，但是磁盤并沒有真正被刪掉，ASM在后臺嘗試將磁盤上的數據挪到其他可用磁盤中，這時磁盤的狀態為DROPPING。

當后臺數據同步的操作完成，磁盤的組信息被清除，磁盤恢復STATE狀態。這時這個磁盤就從ASM中被徹底刪除。

總結

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