[Info-vax] Clock running very slow on an Alpha

[Mark Berryman]

On 8/25/10 2:12 PM, Richard B. Gilbert wrote:
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> The maximum error that a standard NTP can correct is 43 seconds per day!
>

That is not at all correct.  NTP is capable of correcting any amount of 
error.  You simply set parameters that define how much error is fixed by 
slewing the clock vs when the clock is corrected in a single step.

I have had systems come up with a date several years wrong because the 
TOY clock does not keep year information and a backup had just been 
restored.  NTP updated the clock just fine in these cases.

NTP routinely corrects errors of 3600 or more seconds twice a year for 
many systems.  That is why the sanity timer usually defaults to a value 
of 4000.

Mark Berryman

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