今天装了个Oracle 11.2.0.3的环境，结果发现diskmon总是处于offline状态：
[root@osdbso ~]# crs_stat -t
Name Type Target State Host
------------------------------------------------------------
ora.DATA.dg ora....up.type ONLINE ONLINE osdbso
ora....ER.lsnr ora....er.type ONLINE ONLINE osdbso
ora.asm ora.asm.type ONLINE ONLINE osdbso
ora.cssd ora.cssd.type ONLINE ONLINE osdbso
ora.evmd ora.evm.type ONLINE ONLINE osdbso
ora.oemrep.db ora....se.type ONLINE ONLINE osdbso
ora.ons ora.ons.type OFFLINE OFFLINE
由于在之前的版本中ora.diskmon和ora.cssd服务是互相依赖的，及这两个服务中随便停止那个两个都会停止，同样的随便启动那个两个都会启动。
可是在上面的案例中，我发现cssd服务是起来的。查看一下这两个服务的属性
[root@osdbso ~]# crs_stat -p ora.diskmon
NAME=ora.diskmon
TYPE=ora.diskmon.type
ACTION_SCRIPT=
ACTIVE_PLACEMENT=0
AUTO_START=
CHECK_INTERVAL=3
DESCRIPTION="Resource type for Diskmon"
FAILOVER_DELAY=0
FAILURE_INTERVAL=3
FAILURE_THRESHOLD=5
HOSTING_MEMBERS=
PLACEMENT=balanced
RESTART_ATTEMPTS=10
SCRIPT_TIMEOUT=60
START_TIMEOUT=600
STOP_TIMEOUT=60
UPTIME_THRESHOLD=5s
[root@osdbso ~]# crs_stat -p ora.cssd
NAME=ora.cssd
TYPE=ora.cssd.type
ACTION_SCRIPT=
ACTIVE_PLACEMENT=0
AUTO_START=
CHECK_INTERVAL=30
DESCRIPTION="Resource type for CSSD"
FAILOVER_DELAY=0
FAILURE_INTERVAL=3
FAILURE_THRESHOLD=5
HOSTING_MEMBERS=
PLACEMENT=balanced
RESTART_ATTEMPTS=5
SCRIPT_TIMEOUT=600
START_TIMEOUT=600
STOP_TIMEOUT=900
UPTIME_THRESHOLD=1m
发现两者的随has自动启动属性都是never，以为和这个有关，然后都修改为随has自动启动：
crsctl modify resource "ora.diskmon" -attr "AUTO_START=1"
crsctl modify resource "ora.cssd^C-attr "AUTO_START=1"
然后从其cssd或者diskmon的服务：
[root@osdbso ~]# crsctl stop resource ora.cssd
CRS-2673: Attempting to stop 'ora.cssd' on 'osdbso'
CRS-2677: Stop of 'ora.cssd' on 'osdbso' succeeded
[root@osdbso ~]# crsctl start resource ora.diskmon
CRS-2672: Attempting to start 'ora.diskmon' on 'osdbso'
CRS-2672: Attempting to start 'ora.cssd' on 'osdbso'
CRS-2676: Start of 'ora.cssd' on 'osdbso' succeeded
启动的时候也提示diskmon服务成功启动，但是查依然是offline状态，并且cssd服务的日志里面存着如下信息：
2012-05-01 10:46:43.735: [ default][3976595200]CELL communication is configured to use 0 interface(s):2012-05-01 10:46:43.735: [ default][3976595200]Kgzf_ini_begin: diskmon is disabled
2012-05-01 10:46:43.735: [ CSSD][3976595200]clssscSAGEInitFencing: kgzf fence initialization successfully started
直接就误解了，没办法还是上MOS把，结果不查不知道一查吓一跳，原来在11.2.0.3版本的非Exadata数据库上，diskmon的服务是被disable掉的。
请看官文：
11.2.0.3 Grid Infrastructure diskmon Will be Offline by Default in Non-Exadata Environment [ID 1346881.1] 修改时间 26-SEP-2011 类型 ANNOUNCEMENT 状态 PUBLISHED
In this Document
Prior to 11.2.0.3:
grid 3361 3166 0 22:57 ? 00:00:00 /ocw/grid/bin/diskmon.bin -d -f
On 11.2.0.3:
>> no more diskmon.bin