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тАО04-24-2009 11:22 AM
тАО04-24-2009 11:22 AM
NTP and Alpha Hardware Clock
The system is a Compaq AlphaServer DS20E 666 Mhz running OpenVMS V8.3
I assume on startup, the system time is set by a battery powered hardware clock. With the system time being disciplined by NTP, is the hardware clock automatic set to the system time? Maybe this is only done on system shutdown.
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тАО04-24-2009 12:44 PM
тАО04-24-2009 12:44 PM
Re: NTP and Alpha Hardware Clock
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тАО04-24-2009 01:37 PM
тАО04-24-2009 01:37 PM
Re: NTP and Alpha Hardware Clock
Now the next question: Does NTP do this periodically? My only concern is when we get a non-graceful system shutdown, ie crash after he machine has been running for a couple of months.
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тАО04-24-2009 01:52 PM
тАО04-24-2009 01:52 PM
Re: NTP and Alpha Hardware Clock
Neither the TCP/IP Services ntp server nor DECnet-Plus DTSS touch the TOY or the BB_WATCH in any fashion.
This same basic case was at the core of the yearly "fun" with some obscure VAX TOY clock "maintenance" requirements:
http://labs.hoffmanlabs.com/node/615
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тАО04-24-2009 01:59 PM
тАО04-24-2009 01:59 PM
Re: NTP and Alpha Hardware Clock
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тАО04-24-2009 02:00 PM
тАО04-24-2009 02:00 PM
Re: NTP and Alpha Hardware Clock
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тАО04-24-2009 05:24 PM
тАО04-24-2009 05:24 PM
Re: NTP and Alpha Hardware Clock
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тАО04-24-2009 05:31 PM
тАО04-24-2009 05:31 PM
Re: NTP and Alpha Hardware Clock
The one wildcard here is whether TCP/IP Services does this quick-synch with ntpdate itself; I haven't looked in detail. Based on a quick search, it doesn't. Or it doesn't seem to do this using ntpdate.
There may well be some other mechanism(s) that can be used here.
And yes, the periodic SET TIME does address other issues.