SQL> col name format a30
SQL> col value format a30
SQL> set linesize 200
SQL> select name,value from v$asm_attribute where name like 'compatible.%' and group_number=(
2 select group_number from v$asm_diskgroup where);
NAME VALUE
------------------------------ ------------------------------
compatible.asm 11.2.0.0.0
compatible.rdbms 11.2.0.0.0
compatible.advm 11.2.0.0.0
磁盘默认的可脱机时间为3.6小时，可以通过修改磁盘组的disk_repair_time属性来调整这个值（H或者h表示小时，M或者m表示分钟）：
SQL> select name,value from v$asm_attribute where and group_number=(
2 select group_number from v$asm_diskgroup where);
NAME VALUE
------------------------------ ------------------------------
disk_repair_time 3.6h
SQL> alter diskgroup data set attribute 'disk_repair_time'='4.5h';
Diskgroup altered.
SQL> select name,value from v$asm_attribute where and group_number=(
2 select group_number from v$asm_diskgroup where);
NAME VALUE
------------------------------ ------------------------------
disk_repair_time 4.5h
另外还可以使用ALTER DISKGROUP的DROP AFTER子句来覆盖磁盘组的disk_repair_time属性：
SQL> select name,group_number from v$asm_diskgroup where;
NAME GROUP_NUMBER
------------------------------ ------------
DATA 2
SQL>
SQL> select group_number,name,state from v$asm_disk where group_number=2;
GROUP_NUMBER NAME STATE
------------ ------------------------------ ----------------
2 DATA02 NORMAL
2 DATA01 NORMAL
SQL> alter diskgroup data offline disk data02;
Diskgroup altered.
SQL> alter diskgroup data online disk data02;
Diskgroup altered.
SQL> alter diskgroup data offline disk data02 drop after 20m;
Diskgroup altered.
SQL> alter diskgroup data online disk data02;
Diskgroup altered.
四.SYSASM权限和OSASM（asmadmin）系统组。
为了使管理更加有针对性，Oracle 11gR2将管理权限进行细化，管理ASM的操作系统组叫做OSASM(asmadmin)，凡是属于该组的用户都可以以sysasm的身份登录ASM实例。sysasm权限是管理ASM的最高权限，可以执行所有的ASM实例管理操作；另外还保留了sysdba权限，被赋予该权限的ASM用户只能执行普通的管理操作。SYSASM、SYSDBA是ASM实例用户具有的权限，asmadmin是操作系统组。
[grid@rhel2 ~]$ id grid
uid=1100(grid) gid=1000(oinstall) groups=1000(oinstall),1100(asmadmin),1300(asmdba),1301(asmoper)
[grid@rhel2 ~]$ sqlplus / as sysasm
SQL*Plus: Release 11.2.0.2.0 Production on Wed Jul 10 06:24:31 2013
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 Real Application Clusters and Automatic Storage Management options
SQL> create user asm_check identified by asm_check;
User created.
SQL> grant sysasm to asm_check;
Grant succeeded.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
[grid@rhel2 ~]$ sqlplus asm_check/asm_check as sysasm
SQL*Plus: Release 11.2.0.2.0 Production on Wed Jul 10 06:25:34 2013
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 Real Application Clusters and Automatic Storage Management options
SQL> show user
USER is "SYS"
五.AU_SIZE大小设置。