Thanks Freek and Martin for you reply! We have been using ntpdate for time sync in a cron job in our 10gR2 RAC, guess we'll still need to use it in 11gR2 RAC. I wonder why Oracle provides CTSS since we still need to sync time with a time server? On Wed, Jun 22, 2011 at 11:30 AM, Martin Klier <usn@xxxxxxxxx> wrote: > Hi together, > > I have the same problem, and I solved it with a carefully adjusted drift > file (using ntpdate from time to time) > > Regards > Martin > > D'Hooge Freek schrieb: >> Li, >> >> CTTS will indeed only keep the time of the cluster nodes synchronised >> between the nodes themselves and not with an external source. >> If you want this, then you need to configure the network time protocol (NTP) >> daemon. >> When the NTPD is running, the CTTS process will automatically run in >> "observer" mode. >> >> >> Regards, >> >> Freek D'Hooge >> Uptime >> Oracle Database Administrator >> email: freek.dhooge@xxxxxxxxx >> tel +32(0)3 451 23 82 >> http://www.uptime.be >> disclaimer: www.uptime.be/disclaimer >> >> -----Original Message----- >> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] >> On Behalf Of Li Li >> Sent: woensdag 22 juni 2011 17:17 >> To: oracle-l >> Subject: Question on 11gR2 RAC Cluster Time Synchronization Service (CTSS) >> >> Hi, List, >> >> In a 11.2.0.2 RAC, with 11gR2 RAC Cluster Time Synchronization Service >> (CTSS) running in active mode, CTSS does its work to sync time among >> all nodes in the cluster. However, the time on all nodes gets behind >> after a while (say 5 minutes behind after 8 months) . How would you >> guys handle this situation? and how would you prevent this from >> happening again? I've googled and searched on oracle documentation and >> couldn't find anything about it. >> >> Thanks in advance! >> -Li >> -- >> //www.freelists.org/webpage/oracle-l >> >> >> -- >> //www.freelists.org/webpage/oracle-l >> >> >> > > -- > Usn's IT Blog for Linux, Oracle, Asterisk > http://www.usn-it.de > > -- //www.freelists.org/webpage/oracle-l