**一：查看磁盘组可用空间大小：**

1.

[grid@rac1 ~]$ sqlplus / as sysasm //进入ASM实例

SQL> select name,allocation_unit_size,free_mb,total_mb from v$asm_diskgroup;

NAME ALLOCATION_UNIT_SIZE FREE_MB TOTAL_MB

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

OCR 1048576 29796 30722

DATA 1048576 58142 60256

2.

[grid@rac1 ~]$ asmcmd lsdg

State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name

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

MOUNTED EXTERN N 512 4096 1048576 60256 58142 0 58142 0 N DATA/

MOUNTED NORMAL N 512 4096 1048576 30722 29796 10241 9777 0 Y OCR/

**二：ASM磁盘组扩容(DATA扩容)**

事先准备好/dev/asm-disk5

**添加磁盘：**

SQL> alter diskgroup DATA add disk '/dev/asm-disk5';

Diskgroup altered.

查看大小：

SQL> select name,allocation_unit_size,free_mb,total_mb from v$asm_diskgroup;

NAME ALLOCATION_UNIT_SIZE FREE_MB TOTAL_MB

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

OCR 1048576 29796 30722

DATA 1048576 69052 71168

**删除磁盘：//需要磁盘在ASM中映射的名字 **

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-15054: disk "/DEV/ASM-DISK5" does not exist in diskgroup "DATA"

SQL> select name,path from v$asm_disk_stat;

NAME PATH

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

OCR_0000 /dev/asm-disk2

OCR_0002 /dev/asm-disk4

OCR_0001 /dev/asm-disk3

DATA_0000 /dev/asm-disk1

DATA_0001 /dev/asm-disk5

SQL> alter diskgroup data drop disk DATA_0001;

Diskgroup altered.

SQL> select name,allocation_unit_size,free_mb,total_mb from v$asm_diskgroup;

NAME ALLOCATION_UNIT_SIZE FREE_MB TOTAL_MB

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

OCR 1048576 29796 30722

DATA 1048576 58142 60256

由于ASM条带化特性，添加磁盘以及删除磁盘实际就是数据重新分布Rebalance的过程。

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