1. CRS installation failure on remote node
2. RAC node reboots periodically
3. CRS Application status UKNOWN or OFFLINE
To avoid these issues configure NTP (Network Time Protocol) on both nodes using any one of the following methods
1. system-config-time or system-config-date or dateconfig
Type command system-config-time or system-config-date or dateconfig at terminal --> Click “Network Time Protocol” ->check “Enable Network Time Protocol” and select NTP server --> Click OK
2. date MMDDHHMMSYY
Type command date with current date and time
3. /etc/ntp.conf
Update /etc/ntp.conf file with timeservers IP addresses and start or restart the ntp daemon
$ /etc/init.d/ntp start
or
$ /etc/rc.d/init.d/ntp start
Once RAC nodes are time sync you might need to shutdown and startup the CRS applications manually.
$ crs_stop ora.testrac1.ons
$ crs_start ora.testrac1.ons
In case if you encounter CRS-0223: Resource 'ora.testrac1.ons’ has placement error then stop and start all CRS Applications to resolve the issue.
$ crs_stop -all
$ crs_start -all
Regards,
Satishbabu Gunukula
http://www.oracleracexpert.com/
Good information, nice post, thanks a lot
ReplyDeleteVery good post on ntp. Both nodes of our RAC rebooted recently and Oracle recommended starting with ntpd -x option.
ReplyDeleteThe key is "-x" in /etc/sysconfig/ntpd
ReplyDeleteIf you are using NTP, and you prefer to continue using it instead of Cluster Time Synchronization Service, then you need to modify the NTP configuration to set the -x flag,
Regards,
Sunil Bhola
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ReplyDelete