configuration ntp on all servers

[Esteban Torres Rodriguez]

Thank you all.

I will stop the services that is more secure.

It will make scheduled stops.


Phebe_Mertes at aotx.uscourts.gov wrote:
> NTDP when it uses a time server, will do small increments to slowly change
> the time.
>
> First, an hour off suggests you are not utilizing or have the wrong tzdata
> installed.
>
> Second, you can assign the rhel pool time servers to allow your servers to
> query a time server so they all become synchronized.
>
> in rhel, system-config-date allows you to set time zone, daylight savings
> and date. I do not recommend this if you are trying to not do a fast time
> change on your database logs. If you have little activity at 0200 hrs, then
> this might be a good time to use this.
>
>
>
>                                                                                                           
>   From:       "Stainforth, Matthew (SD/DS)" <Matthew.Stainforth at gnb.ca>                                   
>                                                                                                           
>   To:         General Red Hat Linux discussion list <redhat-list at redhat.com>                              
>                                                                                                           
>   Date:       11/19/2009 07:05 AM                                                                         
>                                                                                                           
>   Subject:    RE: configuration ntp on all servers                                                        
>                                                                                                           
>   Sent by:    redhat-list-bounces at redhat.com                                                              
>                                                                                                           
>
>
>
>
>
>   
>>> What happens to the logs if they suddenly tell you that you have to
>>>       
>> go
>>     
>>> to the past?
>>>
>>> That is my question.
>>>       
>> An hour off is pretty serious. If it's really that bad, you have a
>> problem.
>> Least intrusive: jump it at 02:00, or jump it in maybe five minute
>> intervals
>> once or twice a day. I'd lean towards the former.
>>     
>
> That could be even worse.  My biggest concern would be the effect on redo
> logs.  I don't know how oracle handles time jumps into the past but my fear
> would be if you ever had to apply those redo logs then they could be
> applied in the wrong order so recovery from backup would be impossible for
> any time span that contained a backward jump.
>
> I agree with Rob Marti, check with the DBAs to see if the operation is safe
> but my guess is they'll say no.  If it were me, I would schedule an outage
> to bring the time back to normal and then enable NTP.
>
> Matt
>
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>   


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# Esteban Torres Rodríguez                       #
# Área de Soporte Técnico                        #
# Subdirección de Sistemas Informáticos          # 
# Empresa Pública Desarrollo Agrario y Pesquero  #
# email: etorres at dap.es                          #
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