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2
votes
0answers
76 views

System clock jumps over 50 seconds randomly

Having a really strange and frustrating issue with system clocks across a few (non virtualized) Ubuntu 12.04 servers. The system clock jumps unpredictably by over 50 seconds. Here's a part of the ...
0
votes
1answer
452 views

CentOS keeps losing its localtime setting? [duplicate]

I'm running an extremely typical CentOS 6.5 server at DigitalOcean. As part of the site setup, I've changed /etc/localtime to something appropriate for me: rm /etc/localtime ln -sf ...
1
vote
0answers
156 views

demonstrate Automatic Hardware Clock Synchronization By the Kernel (11 minute mode) without ntpd

From the man page of hwclock: This mode (we'll call it "11 minute mode") is off until something turns it on. The ntp daemon xntpd is one thing that turns it on. You can Ok, I have a ...
0
votes
2answers
2k views

Correcting CentOS System Clock

Using the time C function (number of seconds since the Epoch) shows that the time on my current CentOS 6 server is about 7 hours behind compared to another server with the correct time. How can I ...
10
votes
2answers
344 views

Linux kernel detecting wrong processor frequency

After a cold boot of a 6.0.8 Debian server (HP ProLiant), ntpd played havoc with system time: offset and jitter with respect to the usual and reliable reference time servers growing without limit. ...
2
votes
0answers
146 views

Hardware Clock (RTC) Stuck / Will Not Increment

After we rebooted one of our servers (RHEL), we noticed that it would hang when entering GRUB. The problem was the countdown in GRUB (Booting in 5... 4......) was not counting down, and was stuck at ...
2
votes
1answer
430 views

EC2 Instance time and hardware clock

I have set up an EC2 instance, running ArchLinux, for use as a server. Doing what I always do when installing Arch, I try to fix the time by using: # hwclock --systohc --utc This does not work, and ...
2
votes
0answers
86 views

Server clock runs fast - sometimes

I have 12.04 Ubuntu servers that make a radio link once per hour to send updates and sync clocks. The clocks all stray by about +/- 0.6 seconds per hour, which is expected based their crystal ppm. ...
1
vote
2answers
179 views

Cent OS 6 clock 3 minutes 35 seconds in the future

I run Cent os 6 64 bit on linode. server (incorrect): date Thu Aug 29 11:41:00 BST 2013 client (correct): date Thu Aug 29 11:37:25 BST 2013 As you can see the server clock is ...
2
votes
5answers
444 views

Linux clock loses 10 minutes every week

One of my linux server's clock loses 10 minutes every now and then, nearly every week. I update the time so it stays correct, and although it doesn't really bother me, i'd like to fix it. I've been ...
0
votes
4answers
36 views

What authentication methods use the system clock to assist authentication?

What authentication methods use the system clock to assist authentication? I have encountered issues in the past with CA and my system clock being slightly out of what sync with what it should be in ...
0
votes
1answer
534 views

KVM guest clock sync with host

I'm running KVM w/ centos 6.x. My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to ...
0
votes
1answer
5k views

How to set hwclock to UTC?

The times on my arch linux workstation got messed up, so I set the system time with date and then the hardware time with sudo hwclock --systohc --utc Now the hwclock gives: Do 04 Apr 2013 ...
4
votes
1answer
311 views

How do I make all Xen guests use their host clock value?

I've set up Xen server under Linux with several guests running, and all was well. After some time I've noticed the clock on the server drifted away, so I installed 'ntpd', and the clock was back to ...
5
votes
3answers
729 views

Dell T710 time issue, clock loses time every day

I have a Dell T710 here at work that for some reason will not keep proper time. Its a dual quadcore with 32GB ram and runs Windows 2008 R2. Instead of Having multiple servers we run a few virtual ...
8
votes
2answers
1k views

What is the clock frequency inside 10Gb and 100Gb Ethernet cards?

As I understand, a 10Gb Ethernet card is capable of putting 10Gb every second on (say) a fibre optics cable. Now naively, for this to happen in hardware, one will need a 10GHz clock running the ...
4
votes
2answers
215 views

how to cause linux system datetime to run faster than real world datetime?

Background I want to monitor a running linux system over several days. It's a custom gentoo build and with much custom software on board. This software has ongoing maintenance timers and cron ...
2
votes
1answer
299 views

Busy Debian server (Xen guest) seems to go to sleep (energy saving mode)

I have a Debian 6 Xen guest that seems to go to sleep from time to time. Randomly, it just stops to answer to any network requests (HTTP, ssh, ping) and only resumes activity when we log on the ...
0
votes
1answer
312 views

Upgrade to Squeeze on KVM VM causes clock problems

So I have this VM (I don't have access to the host system) running Debian Lenny, with the following kernel: 2.6.32-bpo.5-686 #1 SMP This morning I upgraded the VM to Squeeze (finally), and as the ...
3
votes
2answers
570 views

CentOS 5 clock running twice as fast

The system clock on a CentOS 5 install is running twice as fast as it should. The hardware clock is fine, and when I run a ntp sync, it resets to the correct time. But within 2 minutes, it is already ...
5
votes
3answers
579 views

Clock is 10% faster than normal

I'm having some strange problem with the clock on my server – it's about 10% faster than normal. The problem started 2 days ago and I've not done anything special with the server. I tried to turn of ...
2
votes
4answers
382 views

Anybody tried to use graphic card as a precision clock on a Windows server?

I am thinking (constantly) how to make my server be synchronised better than it is. I run some cheap app which syncs me with some stratum 2 server on the colo and drift is about 1-2 ms per 10 sec ...
16
votes
2answers
2k views

What is the largest hardware clock update the Linux kernel “11-minute mode” can make?

When certain time-related programs (like ntpd) are running on a Linux system, the kernel will switch into so-called "eleven minute mode" (see the hwclock man page) whereby it will automatically update ...
1
vote
2answers
20k views

WS2008 NTP - Using time.windows.com,0x9 - Time always skewed forwards

I have a domain controller configured to use time.windows.com (with 0x09 flags set). I've noticed that frequently the systems' clock is fast - it varies from 10 minutes to even 45 minutes. I always ...
2
votes
1answer
292 views

changing timezone affects cron time

I have set up a cron to run at every 26th minute. $ crontab -l 26 * * * * date > /home/time.txt 2> /home/time_err.txt The current time shown by date command. $ date Thu Aug 25 23:26:00 CDT ...
1
vote
1answer
985 views

How time is affected by the ntpd and /etc/localtime

Can anyone explain how ntpd and /etc/localtime and system clock interact with each other, in UNIX or more specific in freeBSD? I'm giving the following long description of the concepts in case I ...
1
vote
4answers
537 views

Getting time to sync with NTP on Centos 5 VM

My Centos 5 VM is drifting time. I have scoured different answers to solve this problem. I've looked at the VMWare's tips and added tinker panic 0 on top of my ntp.conf file. I also changed the ...
3
votes
3answers
2k views

VMware: How to keep time in guest after suspend

I have Gentoo installed as guest OS. I have hardware clock synced with host system, but the clock of OS tend to be wrong after suspend. The only solution I find out is run hwclock -s frequently via ...
2
votes
4answers
1k views

Best way to say “sync all system clocks to this server, when and ONLY when I say so?” Mixed setup of Windows+Linux servers

Title pretty much explains it. Let's say there's 100 servers, various versions of Windows and Linux, and one Windows server is the "master clock." I did look at this question: How do I synchronize ...
1
vote
2answers
708 views

Virtual PC: Issues with clock when guest Linux has a different timezone to the host OS

I'm running Linux (Centos) under Virtual PC in Windows 7. Guest is set to a different time zone then host OS and none of them are UTC. The issue is that when guest boots its time is always set to ...
0
votes
2answers
140 views

Why does my system clock differ across services?

I have my system clock set to UK time, which is currently +0100 (BST) I set this by symlinking the localtime file, as follows /etc/localtime -> /usr/share/zoneinfo/Europe/London The date ...
1
vote
2answers
2k views

How do I troubleshoot root cause of a hung windows (2003) server?

I have a pair of Windows (2003 Server) servers both running MS SQL Server (2008 EE) that each hang every few months. This has been occurring intermittently :( for the past 15 months pretty much since ...
1
vote
2answers
419 views

Seemingly high clock skew between four systems, normal?

I'm researching a bit of a problem maintaining time synchronization between systems. I finally decided to measure the actual clock variance between hosts, and found that over the course of 13 hours, ...
2
votes
2answers
343 views

Windows Time management: Domain Time II a neccessary product?

I ask as I have become part of a network where they have w32 time disabled on machines, and use Domain Time II. Product info here: http://www.greyware.com/software/domaintime/ Just curious if anyone ...
0
votes
2answers
451 views

SW clock drift problem

i got a problem: my linux software clock seems so have a big drift. In order to correct this (and to make ntpd work) I ran adjtimex. And adjtimex "meassured" a drift over -1700s/day and corrected this ...
4
votes
5answers
3k views

Excessive clock drift on AMD Athlon prevents ntpd from synchronizing clock

I've got an AMD Athlon XP-2500+ host (Shuttle MN31 motherboard, nForce 2 IGP + MCP-T chipset) running 32-bit Ubuntu 9.10 (i686 2.6.31-20-generic kernel). Unfortunately, it appears that the clock drift ...
4
votes
7answers
3k views

ESXi VM NTP Server

We need to setup an internal NTP server. Because this server will pretty much ONLY be a time server I was thinking of just creating a VM for it. However, Googling around it appears that there there ...
2
votes
5answers
2k views

NTP failing to update

I am attempting to use ntp on the server. Checking ps the ntpd process seems to be running: ntpd -u ntp:ntp -p /var/run/ntpd.pid -g However the time is not being corrected, any ideas? The drift ...
4
votes
3answers
2k views

Server clock running too slow

The system clock on my dedicated server is running too slow. Every month it loses about 2 minutes. The details are: Cent OS, Linux version 2.6.9. How can I resolve the problem, is there any way to ...
0
votes
4answers
587 views

ntpdate shows 4second time drift / day

I started ntpdate running every night as a cronjob (on two servers). And every morning I have an email telling me the outcome. On one server it's correcting by about 0.8 seconds every day, which seems ...
0
votes
1answer
370 views

Disconnect Local Clock from Domain Controller Clock

How can I disconnect my workstation clock from the domain controller? In other words, I do not want them synchronized.
0
votes
3answers
405 views

Email shows time 1 hour ahead of server time

I have a dedicated linux server. On plesk it shows the correct local time on the server. However, for all the emails on the server for some reason show the time + 1 hour in outlook. See screenshot ...
2
votes
3answers
1k views

Why would a Windows 2003 server clock reset during a reboot?

After a reboot the windows time reset itself to 26 March 2007. This meant it could not connect to any other servers in the domain. We have set the time to the correct value but we are having ...
3
votes
3answers
6k views

How do I stop the clock running fast on a virtualbox client running ubuntu 8.04?

I'm having a problem with the clock running fast in Ubuntu 8.04 server (2.6.24-24-generic kernel) running in VirtualBox 3.04. It's drifting quickly, something like 5 minutes per hour. I think it was ...
0
votes
2answers
8k views

Changing system date & time in OpenSuse 11.1

Opensuse 11.1 date command shows: # date Wed Dec 23 11:43:27 EST 2009 And I want to change it to current date i.e. July 29 00:50:12 2009. The command I am using to do that is # date -s "29 July ...
4
votes
2answers
3k views

Why does Ubuntu 9.04 reset my Windows clock?

I've got a rig with 2 hard drives. I've put Ubuntu 9.04 (Jaunty) on one of the drives and Windows Vista SP2 runs on the other drive. I went with this approach rather than dual boot since I wanted to ...
0
votes
2answers
113 views

Hardware multipliers

Can someone explain the different system multipliers? I know this is a base clock (a.k.a the System clock) then there is a multiplier for the Front side bus (FSB), RAM module, maybe for the RAM ...