Oracle 11.2.0.3
1、报错信息
检查第1节点的CRS alert log，发现存在有下面异常信息
2013-0X-XX 19:27:17.609
[ctssd(18809056)]CRS-2409:The clock on host XXXdb1 is not synchronous with the mean cluster time. No action has been taken as the Cluster Time Synchronization Service is running in observer mode.
2013-0X-XX 19:59:42.312
[ctssd(18809056)]CRS-2409:The clock on host XXXdb1 is not synchronous with the mean cluster time. No action has been taken as the Cluster Time Synchronization Service is running in observer mode.
上面报错的意思是，ORACLE的CTSSD服务发现异常，不能处于观察模式
2、报错信息问题分析
2.1、操作系统的NTPD服务处于启动状态，CTSSD就不会工作，但是只要CTSSD服务启动，正常情况下应该处于观察模式
2.2、当前OS的NTPD服务正在运行，并且，CTSSD不能处于观察模式运行
3、排查过程
3.1、检查两个节点的时间是否存在差异
XXXdb1:/u01/app/11.2.0.3/grid/log/XXXdb1$ssh XXXdb2 date
Mon Jul 15 20:30:17 GMT+08:00 2013
XXXdb1:/u01/app/11.2.0.3/grid/log/XXXdb1$date
Mon Jul 15 20:30:18 GMT+08:00 2013
经检查，时间不存在差异
3.2、检查OS的NTPD服务
XXXdb1:/# lssrc -ls xntpd
Program name: /usr/sbin/xntpd
Version: 3
Leap indicator: 00 (No leap second today.)
Sys peer: 10.XXX.XXX.71
Sys stratum: 2
Sys precision: -18
Debug/Tracing: DISABLED
Root distance: 0.000397
Root dispersion: 0.013458
Reference ID: 10.XXX.XXX.71
Reference time: d58e6e41.d0fca000 Mon, Jul 15 2013 20:49:05.816
Broadcast delay: 0.003906 (sec)
Auth delay: 0.000122 (sec)
System flags: bclient auth pll monitor filegen
System uptime: 30149695 (sec)
Clock stability: 0.047607 (sec)
Clock frequency: 0.000000 (sec)
Peer: 10.XXX.XXX.71
flags: (configured)(sys peer)
stratum: 1, version: 3
our mode: client, his mode: server
Subsystem Group PID Status
xntpd tcpip 4128900 active
经检查两个节点，OS层的NTPD都在运行，并且可以做时间同步
3.3、检查ctssd的运行情况
XXXdb1:/#su - grid
XXXdb1:/home/grid$ crsctl stat res ora.ctssd -init
NAME=ora.ctssd
TYPE=ora.ctss.type
TARGET=ONLINE
STATE=ONLINE on XXXdb1
经检查两个节点，CTSSD服务都已经启动
3.4、借助CRS的cluvfy工具诊断CTSS错误的原因
XXXdb1:/home/grid$cluvfy comp clocksync -n all -verbose
Verifying Clock Synchronization across the cluster nodes
Checking if Clusterware is installed on all nodes...
Check of Clusterware install passed
Checking if CTSS Resource is running on all nodes...
Check: CTSS Resource running on all nodes
Node Name Status
------------------------------------ ------------------------
XXXdb2 passed
XXXdb1 passed
Result: CTSS resource check passed
Querying CTSS for time offset on all nodes...
Result: Query of CTSS for time offset passed
Check CTSS state started...
Check: CTSS state
Node Name State
------------------------------------ ------------------------
XXXdb2 Observer
XXXdb1 Observer
CTSS is in Observer state. Switching over to clock synchronization checks using NTP
Starting Clock synchronization checks using Network Time Protocol(NTP)...
NTP Configuration file check started...
The NTP configuration file "/etc/ntp.conf" is available on all nodes
NTP Configuration file check passed
……
Checking NTP daemon command line for slewing option "-x"
Check: NTP daemon command line
Node Name Slewing Option Set?
------------------------------------ ------------------------
XXXdb2 no
XXXdb1 no
Result:
NTP daemon slewing option check failed on some nodes
PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option "-x"
Result: Clock synchronization check using Network Time Protocol(NTP) failed
见上面标红色字体部分，在做NTP slewingoption时，两个节点都不通过，原因为，NTP没有运行在“-X”模式
3.5、检查OS层NTPD的配置
（1）检查/etc/ntpd.conf
server 10.XXX.XXX.71
broadcastclient
driftfile /etc/ntp.drift
tracefile /etc/ntp.trace
（2）检查/etc/rc.tcpip文件的配置
存在有下面信息:
# Start up Network Time Protocol (NTP) daemon
start /usr/sbin/xntpd "$src_running" -a "-x"
看来配置不存在问题，但当前运行却不处于”-x”模式，很有可能是NTPD被重启过，启动时没有加上个”-x”参数
接下来请看第2页精彩内容：
推荐阅读：
Oracle 12C R1 RAC安装CRS
Oracle 11g RAC 执行root.sh时遭遇 CRS-0184/PRCR-1070
Oracle 10g R2 RAC CRS无法启动，CRS-1604:CSSD 表决文件脱机
VMware 下Oracle RAC搬家引起CRS-1006/CRS-0215/CRS-0233