Dear ,
Please I need the solutions for my issue with the time on redhat6
My problem is the server auto update the time on operating system and I have the oracle on it , so how I can stop this issue .
Please note that I don't want to use the (ntp) .

if you are not using NTP then rhel is NOT updating the time
it is using the clock on the MOBO and that NEEDS A BATTERY

???
What is " the oracle" ???????

anything like " The Google"

please be specific
as in ARE you using one of the Oracle databases ?
or is this really a install of OEL and not RHEL ?

It is not using the clock on the mobo. AFAIK kernel keeps its own time. One could periodically run hwclock to set kernel time from mobo, but this is not default.

If you are not used the ntp ...
yes I have the oracle database on it , and i just get the latest update of farmware of the server , but still the problem .

Why don't you switch it off then.

Yes I do it ,
The time late each day two minutes , what is that mean !!!
It's hardware issued or software!!!!
Please advice

I think it's not surprising if your clock is slow. That's why NTP exists.

The computer has a software-based clock whose ticks depend on the regular heartbeat interrupt (100Hz or so, perhaps?). Not very precise.

But your original post says that the system sets the time automatically. How do you see that? Are you sure it's not simply imprecision?

Why is auto update of time a problem?

Why do you not want to use ntp?

Yes, since we know nothing about your hardware. If the computer is not running continuously then the BIOS clock battery could be bad or it could just have a large drift. This might be due to the temperature environment. The system clock is in a nutshell a timer interrupt and depending on the timer used it could drift. PC clocks tend not to be very accurate so running ntp is required.

I think it's not surprising if your clock is slow. That's why NTP exists.

The computer has a software-based clock whose ticks depend on the regular heartbeat interrupt (100Hz or so, perhaps?). Not very precise.

But your original post says that the system sets the time automatically. How do you see that? Are you sure it's not simply imprecision?


thanks for your advice .
i just control every day the clock on the machine so after some days i have a gap on the time machine , that's make some problem of our application (database) .

Why is auto update of time a problem?

Why do you not want to use ntp?

Quote:
It's hardware issued or software!!!!
Yes, since we know nothing about your hardware. If the computer is not running continuously then the BIOS clock battery could be bad or it could just have a large drift. This might be due to the temperature environment. The system clock is in a nutshell a timer interrupt and depending on the timer used it could drift. PC clocks tend not to be very accurate so running ntp is required.
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now i don't have any idea what the time auto update .
my manager he want to use the ntp so i need another solution for that .
the hardware is fujitsu server

Tell your manager he can have an accurate clock with NTP or an inaccurate clock without NTP.
You can run NTP without internet access by the way, but I think you need an external hardware clock connected to your sever in this case.

Or you just set the clock manually from time to time. Perhaps that's an option.

Edit: Instructions for building a stratum 1 time server based on the GPS clock, using a Raspberry Pi: https://xmission.com/blog/2014/05/28...a-raspberry-pi.

There are commercial GPS time servers available if you do not want to build your own.

The common way to keep the clock accurate is using ntp. You can manually determine drift and adjust the clock but not something that I would suggest.