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9
votes
4answers
649 views

How far is “too far off” for ntpd? Can it get there by a sudden jump to heavy load? Can this be overridden?

In many primers on ntpd, like this one, there's always a warning that ntpd will stop resetting the clock "[if] your clock is too far off." How far off is "too far off"? Also, if a server takes a ...
0
votes
1answer
36 views

Windows server and AWS clock synchronization

I have a Windows 7 computer that communicates with Amazon Web Servers (S3, SES). This server uses windows internet time for clock synchronization time.windows.com. On my linux machines I ran into ...
2
votes
0answers
93 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 ...
0
votes
0answers
33 views

I have 0.0.0.0 refid, I assume ntp error

when I run ntpq -p my server is shown. I get the following : refid: 0.0.0.0 st: 2 t: u when:18 poll:64 reach:377 delay: 0.262 offset: -8.622 jitter: 2.470 I just installed ntp and added my server ...
1
vote
2answers
138 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 ...
1
vote
0answers
88 views

Update clock on virtualbox virtual machine with cent os from host

I have a virtual machine, with cent os installed, and everytime I sleep the host computer, the clock of the VM goes out of sync. I would like it to pick up the current time from virtualbox - which I ...
-2
votes
1answer
107 views

System Time Synchronization Procedure [closed]

I am looking for procedure which I can execute in cron to synch the system time in clustered servers. Can any of the experienced SME's please help?
2
votes
1answer
148 views

How to backdate a domain-connected workstation?

I need to verify some test cases by backdating my system. How to do this?
5
votes
3answers
494 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 ...
0
votes
3answers
242 views

Is TimeSync still needed on Windows Server 2008?

I've always used TimeSync on my servers. With Windows' built in internet time updating, should I remove TimeSync? I've never turned off windows time updating even with TimeSync - what is the best ...
1
vote
2answers
16k 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 ...
0
votes
2answers
256 views

Virtualizing NTP server [duplicate]

Possible Duplicate: What are the limits of running NTP servers in virtual machines? I was wondering if virtualizing NTP is okay. I have a VMware ESXi 5.0 box, and I want to virtualize my ...
1
vote
2answers
397 views

SLES guest on HyperV: high CPU usage vs. accurate time keeping

Here is the issue: SLES 10 SP1 guest is running on HyperV. I need accurate timekeeping on this box, so I have applied these kernel parameters (which were proven to work on other identical SLES 10 SP1 ...
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 ...
7
votes
6answers
583 views

What consequences / implications can arise from a wrong system clock?

What issues can you think of that may arise from a wrong system clock setting ? Primarily interested in potential problems affecting servers and Linux or UNIX-like systems in particular. And how ...
4
votes
2answers
331 views

Synchronize time on a private network that must not connect to the Internet

For HIPAA compliance, this network can not be connected to the Internet or to any other network or computer which connects to the Internet. I've got a small private network comprised entirely of Macs ...
1
vote
2answers
3k views

System clock drifting out of sync with hwclock and ntpd

My current system drifts from the hwclock and ntpd dramatically. I've looked at many forums and posts online and on SF, but haven't found a suitable solution. Here is my ntpq -pn output: remote ...
3
votes
2answers
283 views

periodically overridding NTP for simulation purposes

I have this situation: NTP is used to sync time on a set of Windows 7 and Server 2008 machines. Nothing out of the ordinary about this. periodically on this system, the time needs to be changed for ...
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 ...
5
votes
3answers
4k views

Clock synchronisation on kvm guests

I'm having trouble keeping the system clocks sync'd on a number of kvm guests. I've googled a fair bit, and found a lot of different options, many of which I've tried, to no avail. So here I am. ntpd ...
1
vote
5answers
2k views

How do I synchronize clocks between Linux and Windows?

I am running some benchmarks between a Windows client and Linux server. In order to measure the latency correctly I need to synchronize the clocks between the two machines before starting the test - ...