[[email protected] ~]$ su - grid
sqlplus / 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$asm_disk where group_number = 4;
DISK_NUMBER STATE NAME TOTAL_MB FREE_MB
----------- -------- ------------------------------ ---------- ----------
1 DROPPING DATA_0001 1953124 1950842
0 NORMAL DATA_0000 1953124 1948124
SQL> select disk_number, state, name, total_mb, free_mb from v$asm_disk where group_number = 4;
DISK_NUMBER STATE NAME TOTAL_MB FREE_MB
----------- -------- ------------------------------ ---------- ----------
1 DROPPING DATA_0001 1953124 1951434
0 NORMAL DATA_0000 1953124 1947532
SQL> select disk_number, state, name, total_mb, free_mb from v$asm_disk where group_number = 4;
DISK_NUMBER STATE NAME TOTAL_MB FREE_MB
----------- -------- ------------------------------ ---------- ----------
1 DROPPING DATA_0001 1953124 1952556
0 NORMAL DATA_0000 1953124 1946410
SQL> select disk_number, state, name, total_mb, free_mb from v$asm_disk where group_number = 4;
DISK_NUMBER STATE NAME TOTAL_MB FREE_MB
----------- -------- ------------------------------ ---------- ----------
1 DROPPING DATA_0001 1953124 1953096
0 NORMAL DATA_0000 1953124 1945870
SQL> select disk_number, state, name, total_mb, free_mb from v$asm_disk where group_number = 4;
DISK_NUMBER STATE NAME TOTAL_MB FREE_MB
----------- -------- ------------------------------ ---------- ----------
0 NORMAL DATA_0000 1953124 1945854
SQL> select group_number, disk_number, path, name, state, total_mb, free_mb
2 from v$asm_disk
3 where path = ‘/dev/asm-disk5‘;
GROUP_NUMBER DISK_NUMBER PATH NAME STATE TOTAL_MB FREE_MB
------------ ----------- --------------- ---------- -------- ---------- ----------
0 1 /dev/asm-disk5 NORMAL 0 0
可以看到，虽然删除操作执行完成，但是磁盘并没有真正被删掉，ASM在后台尝试将磁盘上的数据挪到其他可用磁盘中，这时磁盘的状态为DROPPING。
当后台数据同步的操作完成，磁盘的组信息被清除，磁盘恢复STATE状态。这时这个磁盘就从ASM中被彻底删除。
原文地址：https://www.cnblogs.com/elontian/p/9427800.html