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тАО11-09-2005 10:19 AM
тАО11-09-2005 10:19 AM
DS10 Clock Drift
Hi Gurus
I need to know the clock drift of DS10 server.
This server is used as NTP server.
Thanks for your quick replies as usual.
Regards
I need to know the clock drift of DS10 server.
This server is used as NTP server.
Thanks for your quick replies as usual.
Regards
2 REPLIES 2
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тАО11-09-2005 08:56 PM
тАО11-09-2005 08:56 PM
Re: DS10 Clock Drift
Hello Horace,
The following text has been taken from the OpenVMS FAQ document. I hope that it helps.
"ALPHA17. What is the Accuracy of the Alpha Time of Year (BB_WATCH) Clock?
The specification for maximum clock drift in the Alpha hardware clock is 50 ppm, that's less than +/-.000050 seconds of drift per second, less than +/-.000050 days of drift per day, or less than +/-.000050 years of drift per year, etc. (eg: An error of one second over a day-long interval is roughly 11ppm, or 1000000/(24*60*60).) Put another way, this is .005%, which is around 130 seconds per month or 26 minutes per year.
The software-maintained system time can drift more, primarily due to other system activity. Typical causes of drift include extensive high-IPL code (soft memory errors, heavy activity at device IPLs, etc) that are causing the processing of the clock interrupts to be blocked."
Regards,
Ian
The following text has been taken from the OpenVMS FAQ document. I hope that it helps.
"ALPHA17. What is the Accuracy of the Alpha Time of Year (BB_WATCH) Clock?
The specification for maximum clock drift in the Alpha hardware clock is 50 ppm, that's less than +/-.000050 seconds of drift per second, less than +/-.000050 days of drift per day, or less than +/-.000050 years of drift per year, etc. (eg: An error of one second over a day-long interval is roughly 11ppm, or 1000000/(24*60*60).) Put another way, this is .005%, which is around 130 seconds per month or 26 minutes per year.
The software-maintained system time can drift more, primarily due to other system activity. Typical causes of drift include extensive high-IPL code (soft memory errors, heavy activity at device IPLs, etc) that are causing the processing of the clock interrupts to be blocked."
Regards,
Ian
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тАО11-10-2005 04:50 AM
тАО11-10-2005 04:50 AM
Re: DS10 Clock Drift
Thanks man.
This will help a lot
I will let u know if i need anything else
Best Regards
Horace
This will help a lot
I will let u know if i need anything else
Best Regards
Horace
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