Re: [CentOS] System Time

On 3/8/2020 1:55 PM, Frank Cox wrote:  Digital cinema equipment is the only commercial electronic equipment that I know of that is deliberately designed to not do what it's intended to do When someone asks why their firewall is blocking such and such, I sometimes respond that firewalls are

Re: [CentOS] System Time

On Sun, 8 Mar 2020 at 14:01, Chris Olson via CentOS wrote: > A few years ago, one of our interns was curious about system > time keeping features in computer systems. This intern was > also the proud owner of an inexpensive Radio-Controlled Clock. > The intern wondered why computer motherboards

Re: [CentOS] System Time

Once upon a time, Pete Biggs said: > There's also a massive problem with > signal strength in the UK - the (singular) time transmitter is in the > middle of the country in Cumbria and in the south it's virtually > impossible getting a signal any further than about 2 feet from a window > - not a

Re: [CentOS] System Time

--On Sunday, March 08, 2020 6:59 PM + Chris Olson via CentOS wrote: All of our bedrooms have Radio-Controlled Clocks. At 5:30 this morning, half of the clocks displayed the correct time. The other half of the clocks were incorrectly showing a time one hour ahead. Probably a result of

Re: [CentOS] System Time

On Sun, 8 Mar 2020 17:59:16 + (UTC) Chris Olson via CentOS wrote: > why computer motherboards were not just > equipped with a chip like the ones in the RCC so that their > system time would always be correct. Digital cinema servers (the gadgets that feed the movie to the projector and sound

Re: [CentOS] System Time

On Sun, 2020-03-08 at 17:59 +, Chris Olson via CentOS wrote: > A few years ago, one of our interns was curious about system > time keeping features in computer systems. This intern was > also the proud owner of an inexpensive Radio-Controlled Clock. > The intern wondered why computer

[CentOS] System Time

A few years ago, one of our interns was curious about system time keeping features in computer systems.  This intern was also the proud owner of an inexpensive Radio-Controlled Clock. The intern wondered why computer motherboards were not just equipped with a chip like the ones in the RCC so that

Re: [CentOS] System Time Source

On Thu, May 25, 2017 11:16 am, Lamar Owen wrote: > [Going a bit off-topic here, and going to do a bit of a deep-dive on RF > stuff, but maybe it will be useful to Chris] Lamar, thanks a lot for very instructive write-up!! Valeri > > On 05/24/2017 12:20 PM, Valeri Galtsev wrote: >> It is

Re: [CentOS] System Time Source

[Going a bit off-topic here, and going to do a bit of a deep-dive on RF stuff, but maybe it will be useful to Chris] On 05/24/2017 12:20 PM, Valeri Galtsev wrote: It is insightful, yet... There are a bunch of other factors that may need to be taken into account. Angular transmission pattern of

Re: [CentOS] System Time Source

Time on computers is typically set using Network Time Protocol (NTP) over the internet however I believe these [1] devices do what you're describing. [1] - https://www.meinbergglobal.com/english/products/pci-express-clocks.htm On 24 May 2017 at 15:53, Chris Olson wrote:

[CentOS] System Time Source Responses

It looks like we may have hit on a popular subject with the questions about system time sources.  Thanks for all of the responses.  Our intern and senior software staff now have useful information and new perspective. ___ CentOS mailing list

Re: [CentOS] System Time Source

On Wed, May 24, 2017 10:45 am, Warren Young wrote: > On May 24, 2017, at 8:52 AM, Chris Adams wrote: >> >> Once upon a time, Warren Young said: >>> a. It’s transmitting from a fixed location in a time zone you >>> probably aren’t in — US Mountain —

Re: [CentOS] System Time Source

On 05/24/2017 11:37 AM, Tate Belden wrote: Warren, one slight correction on an other wise nicely written bit of info: The time transmitted from WWV is not Mountain Time. Even though the WWV transmitter farm is located in the Mountain time zone, the signals are transmitted as "Coordinated

Re: [CentOS] System Time Source

On May 24, 2017, at 9:37 AM, Tate Belden wrote: > > The time transmitted from WWV is not Mountain Time. I should have split the paragraph, because I didn’t mean to imply that that was the case. My point in mentioning the transmission location is to show that it’s probably a

Re: [CentOS] System Time Source

On Wed, 24 May 2017, Pete Biggs wrote: The GPS time system is also notoriously very precisely wrong. The time was set when the first satellite was sent up and has never been corrected since - so hasn't taken account of leap seconds or relativistic effects. All that matters for GPS is that the

Re: [CentOS] System Time Source

On 05/24/2017 11:29 AM, Pete Biggs wrote: ... The terrestrial radio clocks are actually not that accurate. They are not designed for keeping things like a system clock "correct". Commercial solutions only keep to within about +/- 0.5s per day, with resynchronisation happening about once a day.

Re: [CentOS] System Time Source

On May 24, 2017, at 8:52 AM, Chris Adams wrote: > > Once upon a time, Warren Young said: >> a. It’s transmitting from a fixed location in a time zone you probably >> aren’t in — US Mountain — being the least populous of the lower 48’s four >> time zones.

Re: [CentOS] System Time Source

Warren, one slight correction on an other wise nicely written bit of info: The time transmitted from WWV is not Mountain Time. Even though the WWV transmitter farm is located in the Mountain time zone, the signals are transmitted as "Coordinated Universal time", UTC, or 'Zulu' time. Here, you

Re: [CentOS] System Time Source

On Wed, 2017-05-24 at 13:53 +, Chris Olson wrote: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our senior >

Re: [CentOS] System Time Source

Once upon a time, Warren Young said: > a. It’s transmitting from a fixed location in a time zone you probably aren’t > in — US Mountain — being the least populous of the lower 48’s four time > zones. You therefore have to configure time zone offset and DST rules, which >

Re: [CentOS] System Time Source

Chris Olson kirjoitti 24.5.2017 klo 16.53: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services. This begged a question about why every computer > would not have a radio module to receive time. Terrestrial time services

Re: [CentOS] System Time Source

On May 24, 2017, at 7:53 AM, Chris Olson wrote: > > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services. There are two major types: 1. WWVB and its equivalents in other countries:

Re: [CentOS] System Time Source

Once upon a time, Chris Olson said: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our

Re: [CentOS] System Time Source

Chris Olson wrote: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our senior > staff did not have a good answer or if

Re: [CentOS] System Time Source

On 05/24/2017 09:53 AM, Chris Olson wrote: One of our STEM interns recently observed that there are inexpensive clocks that sync via radio to standard time services. This begged a question about why every computer would not have a radio module to receive time. Our senior staff did not have a

[CentOS] System Time Source

One of our STEM interns recently observed that there are inexpensive clocks that sync via radio to standard time services.  This begged a question about why every computer would not have a radio module to receive time.  Our senior staff did not have a good answer or if time from such a radio

[CentOS] System Time Jumps During Boot on CentOS 7

Hi All, Just noticed a funny time jump on a testing CentOS 7 VM. Specifically the system time jumps around by a few hours during system boot. The below is a selection from /var/log/messages during boot: Jan 19 12:49:57 arr-data-dev chronyd[716]: Frequency -0.829 +/- 0.007 ppm read from

[CentOS] System Time - UTC and Local Time

I have installed CentOS on a VM by checking 'System Clock uses UTC' option. Later I selected CST time zone. Now the date command shows UTC time with CST timezone: Thu Dec 1 04:14:39 CST 2011. How do I change system clock to show CST local time? Also, more likely a dumb question but why isn't

Re: [CentOS] System Time - UTC and Local Time

On Thu, Dec 1, 2011 at 9:47 PM, Johan Martinez jmart...@gmail.com wrote: I have installed CentOS on a VM by checking 'System Clock uses UTC' option. Later I selected CST time zone. Now the date command shows UTC time with CST timezone: Thu Dec 1 04:14:39 CST 2011. How do I change system

Re: [CentOS] System Time - UTC and Local Time

On 12/01/2011 10:17 AM, Johan Martinez wrote: I have installed CentOS on a VM by checking 'System Clock uses UTC' option. Later I selected CST time zone. Now the date command shows UTC time with CST timezone: Thu Dec 1 04:14:39 CST 2011. How do I change system clock to show CST local time?

Re: [CentOS] System Time - UTC and Local Time

Thanks for the explanation Johnny. I checked on 'System Clock uses UTC' option and on the next screen I set timezone to CST. I don't remember what exactly I did there. I changed /etc/sysconfig/clock as you mentioned and then also changed the currently set datetime using date command. Then I

Re: [CentOS] System Time - UTC and Local Time

On Thu, Dec 1, 2011 at 10:30 AM, Digvijay Patankar dbpatan...@gmail.comwrote: On Thu, Dec 1, 2011 at 9:47 PM, Johan Martinez jmart...@gmail.com wrote: I have installed CentOS on a VM by checking 'System Clock uses UTC' option. Later I selected CST time zone. Now the date command shows UTC

Re: [CentOS] system time automatically fowards in time and then comes back to normal

ankush grover schrieb: Hi friends, I am running Nagios 2.7-1 on Centos 5.0 32-bit hosted on Vmware ESX 4.0. The issue I am seeing on the server is sometimes nagios is showing the below messages in /var/log/messages and as the system time gets changed some false alarms gets generated. I

Re: [CentOS] system time automatically fowards in time and then comes back to normal

ankush grover wrote: Earlier this server was syncing time through ntp daemon and below is the ntp.conf file. Now I have set a cronjob which sync the time with Best not to run NTP inside a ESX VM. I've never gotten NTP to sync inside of VMware outside of a kernel with VMI enabled (no versions

Re: [CentOS] system time automatically fowards in time and then comes back to normal

On Sun, Nov 22, 2009 at 7:08 AM, nate cen...@linuxpowered.net wrote: ankush grover wrote: Earlier this server was syncing time through ntp daemon and below is the ntp.conf file. Now I have set a cronjob which sync the time with Best not to run NTP inside a ESX VM. I've never gotten NTP to

Re: [CentOS] system time automatically fowards in time and then comes back to normal

Akemi Yagi wrote: for VMware products including ESX and ESXi. According to their current recommendations, In all cases use NTP instead of VMware Tools periodic time synchronization. I've been using vmware for 10 years, and I've never, ever ever gotten NTP to hold sync inside of a VM outside

Re: [CentOS] system time automatically fowards in time and then comes back to normal

nate wrote: Akemi Yagi wrote: for VMware products including ESX and ESXi. According to their current recommendations, In all cases use NTP instead of VMware Tools periodic time synchronization. I've been using vmware for 10 years, and I've never, ever ever gotten NTP to hold

Re: [CentOS] system time automatically fowards in time and then comes back to normal

Benjamin Franz schrieb: nate wrote: Akemi Yagi wrote: for VMware products including ESX and ESXi. According to their current recommendations, In all cases use NTP instead of VMware Tools periodic time synchronization. I've been using vmware for 10 years, and I've never, ever ever

Re: [CentOS] system time automatically fowards in time and then comes back to normal

nate wrote: ankush grover wrote: Earlier this server was syncing time through ntp daemon and below is the ntp.conf file. Now I have set a cronjob which sync the time with Best not to run NTP inside a ESX VM. I've never gotten NTP to sync inside of VMware outside of a kernel with

Re: [CentOS] system time automatically fowards in time and then comes back to normal

On Sun, Nov 22, 2009 at 12:19 PM, Clint Dilks cli...@scms.waikato.ac.nz wrote: The OP should also reference this document http://kb.vmware.com/selfservice/microsites/search.do?language=en_UScmd=displayKCexternalId=1006427 This is the 3rd time that KB article was quoted in this thread... :-D

[CentOS] system time automatically fowards in time and then comes back to normal

Hi friends, I am running Nagios 2.7-1 on Centos 5.0 32-bit hosted on Vmware ESX 4.0. The issue I am seeing on the server is sometimes nagios is showing the below messages in /var/log/messages and as the system time gets changed some false alarms gets generated. I searched it on the google but I

Re: [CentOS] system time automatically fowards in time and then comes back to normal

On Sun, Nov 22, 2009 at 12:19 AM, ankush grover ankushcen...@gmail.com wrote: Hi friends, I am running Nagios 2.7-1 on Centos 5.0 32-bit hosted on Vmware ESX 4.0. The issue I am seeing on the server is sometimes nagios is showing the below messages in /var/log/messages and as the system time

Re: [CentOS] system time automatically fowards in time and then comes back to normal

ankush grover wrote: Hi friends, I am running Nagios 2.7-1 on Centos 5.0 32-bit hosted on Vmware ESX 4.0. The issue I am seeing on the server is sometimes nagios is showing the below messages in /var/log/messages and as the system time gets changed some false alarms gets generated. I