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Enable or restart ntp client to cause Oracle RAC nodes reboot

November 23, 2010 Leave a comment Go to comments

Symptoms

We can simulate the problem with set system time a few second advance and restart ntp as the following

1. date -a 7

2. Wait about 1 minutes (

3. Restart the ntp

# svcadm restart svc:/network/ntp:default

4. RAC node got reboot and the /var/adm/messages get the following

Nov 23 10:18:59 qapdb03 xntpd[302]: [ID 866926 daemon.notice] xntpd exiting on signal 15
Nov 23 10:19:00 qapdb03 ntpdate[10199]: [ID 774510 daemon.notice] step time server 192.168.31.220 offset -3.733644 sec
Nov 23 10:19:00 qapdb03 xntpd[10225]: [ID 702911 daemon.notice] xntpd 3-5.93e+sun 03/08/29 16:23:05 (1.4)
Nov 23 10:19:00 qapdb03 xntpd[10225]: [ID 301315 daemon.notice] tickadj = 5, tick = 10000, tvu_maxslew = 495, est. hz = 100
Nov 23 10:19:00 qapdb03 xntpd[10225]: [ID 266339 daemon.notice] using kernel phase-lock loop 0041, drift correction 0.00000
Nov 23 10:19:00 qapdb03 xntpd[10225]: [ID 266339 daemon.notice] using kernel phase-lock loop 0041, drift correction 7.70099

Finding  Solutions

I got three solutions from internet with similar symptoms

1.  Set the following system parameters

set tod_broken = 1
set dosynctodr = 0

Comment: It didn’t work, nodes still got reboot

2. Set /etc/inet/ntp.conf with “slewalways yes” or -x

Comment: It didn’t work, nodes still got reboot

3. Set oracle clusterware parameter diagwait to 13 second ( default = 500ms)

Comment: It worked

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