-> We have 2 servers server1 and server2 server.
->server1 is master application and server2 is slave application server. ->output of server1 hardware and slave timing:
Code:
# hwclock --show Thu 05 Jun 2014 05:34:08 PM SGT -0.465666 seconds # date Thu Jun 5 17:34:16 SGT 2014
# cd /etc/sysconfig/
# ls -ltr clock* -rw-r--r-- 1 root root 179 Jul 3 2008 clock
# cat clock
# The ZONE parameter is only evaluated by system-config-date. # The timezone of the system is defined by the contents of /etc/localtime.
ZONE="Asia/Singapore"
UTC=false
ARC=false
*************
# ->output of server2 server hardware and software info:
# hwclock --show Thu 05 Jun 2014 04:02:23 PM SGT -0.225825 seconds
# date Thu Jun 5 17:05:05 SGT 2014
# hwclock --show Thu 05 Jun 2014 04:13:40 PM SGT -0.436206 seconds # date Thu Jun 5 17:15:14 SGT 2014
# cd /etc/sysconfig/
# cat clock
# The ZONE parameter is only evaluated by system-config-date.
# The timezone of the system is defined by the contents of /etc/localtime. ZONE="Asia/Singapore"
UTC=false
ARC=false
# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.7 (Tikanga) # ->There is a change in the hardware and linux system time change.
-> We know how to change the system and hardware timing.
-> Need advice if we want to change the hardware and system timing then what is the procedure and impact on server appllicationa.
->Kindliy assist.
Last edited by Scott; 06-05-2014 at 08:10 AM..
Reason: Please use code tags
2) Setting System timing to according to Hardware timing:
Code:
# hwclock -s
or
Code:
# hwclock -hctosys
Please advice either hardwae to system timing copy will be ok or system to hardware timing ok?
3) We have already set the time zone so I will not change it.
4) We have some application running over these system where server1 is master and server2 as slave. kindly also advice that we need to stop out application or without stopping, we can proceed for time change?
5)I checked on the internet and mentiond like hardware clock always keep running even after the server is in shutdown status while system clock depends on kernal. once linux OS is shutdwon then system clock stop running.
Kindly Advice...
Last edited by Franklin52; 06-05-2014 at 11:10 AM..
Reason: Please use code tags
Yes, you are correct. Instead of manually changing or updating time, I restarted the ntp serices. I found the reason of this time difference that last week this server rebooted and ntp services was not running. After restarting ntp services, automatically system timing synced with ntp server. Application was not depend on this timing so without stopping application, I am able to do this.
After this, using below command I synced hardware timing to system timing:
hwclick --systohc
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