Alan Cox wrote:
On Llu, 2003-06-02 at 21:44, McKown, John wrote:
Just an observation that may well be very stupid. Since Linux/390 can use
NTP to sync time, then it must be that Linux/390 uses a software clock
instead of the hardware clock (TOD clock). Is this true? If so, what happens
if
, June 02, 2003 10:54 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
On Mon, 2003-06-02 at 15:35, Richard Troth wrote:
I note that the zSeries clock is (800, 900, even 9672s)
is awfully accurate compared to even the newest PCs.
(Have not compared it to Sun or HP mid-range hardware
, or
distribution of this transmission, or taking any action based on it, is
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-Original Message-
From: Steven A. Adams [mailto:[EMAIL PROTECTED]
Sent: Friday, May 30, 2003 5:36 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
On Fri, 2003-05-30 at 14:10, Alan Cox wrote
wrote:
On Fri, 30 May 2003, Steven A. Adams wrote:
I am being told that there is not a way to use ntpd under one of
my
Linux guests to set the clock and propagate these settings through
VM to
the CTC.
We have a bunch of Linux guests doing time sync over Guest LAN
directly to
an NTP server
: [LINUX-390] Time Sync
On Fri, 2003-05-30 at 16:34, Michael Morgan wrote:
All of our S/390 systems (Linux/390, VM z/OS) get the time from an
external time source..ie the IBM 9037 sysplex timer. We manually set the
time in the sysplex timer (about once a year :)) We don't care how
accurate
PROTECTED]
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| cc:
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| Subject: Re: Time Sync
:[EMAIL PROTECTED]
Sent: Friday, May 30, 2003 5:40 PM
To: [EMAIL PROTECTED]
Subject: Time Sync
This might be a little off topic so feel free to let me know if it is.
Our z/800 is about 90 seconds off of time with the rest of the network
and this is starting to cause some havoc
Steve ...
Linux/390 will synch time with NTP
just as effectively as Linux on a PC will.
VM does not benefit from this (but is not harmed by it).
I have *not* found NTP to be a resource hog; in fact, it is
designed to be kind of low impact. (Seems to sleep a lot
waiting for time to pass and
Talk to your network gang, too. Cisco router IOS at release 12.0 or
better has NTP support. Adjust you firewall to allow it to request the
time from one of the Cesium clocks (Naval Observatory I think), and
you've got the time. We point our Linux instances at the Cisco for
second level
PROTECTED]
Sent: Friday, May 30, 2003 4:48 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
Steve ...
Linux/390 will synch time with NTP
just as effectively as Linux on a PC will.
VM does not benefit from this (but is not harmed by it).
I have *not* found NTP to be a resource hog; in fact
: McKown, John [SMTP:[EMAIL PROTECTED]
Sent: Monday, June 02, 2003 4:44 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
Just an observation that may well be very stupid. Since Linux/390 can use
NTP to sync time, then it must be that Linux/390 uses a software clock
instead of the hardware
[mailto:[EMAIL PROTECTED]
Sent: Monday, June 02, 2003 4:44 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
Just an observation that may well be very stupid. Since Linux/390 can use
NTP to sync time, then it must be that Linux/390 uses a software clock
instead of the hardware clock (TOD clock
] On Behalf
Of
McKown, John
Sent: Monday, June 02, 2003 4:44 PM
To: [EMAIL PROTECTED]
Subject: Re: [LINUX-390] Time Sync
Just an observation that may well be very stupid. Since Linux/390
can use
NTP to sync time, then it must be that Linux/390 uses a software
clock
instead of the hardware clock (TOD
On Llu, 2003-06-02 at 21:44, McKown, John wrote:
Just an observation that may well be very stupid. Since Linux/390 can use
NTP to sync time, then it must be that Linux/390 uses a software clock
instead of the hardware clock (TOD clock). Is this true? If so, what happens
if somebody down the
[mailto:[EMAIL PROTECTED]
Sent: Monday, June 02, 2003 4:14 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
-snip-
It wouldn't neccessarily make sense to use the TOD clock like that.
S/390 differs from the PC I guess in that the TOD clock is probably
vaguely accurate.
Even then you'd want to query
Umm, no. That's what started this whole thread. Mainframe clocks
drift as much as, if not more than, PC clocks, ...
Uhh... okay, well then I may be sorry for what I just posted.
See my other note about the [X]NTPD drift file. Why would that be
better on the mainframe? (Even on VM
On Tue, 3 Jun 2003 04:53, you wrote:
John,
;-) You got my attention.
--
Cheers
John Summerfield
Microsoft's most solid OS: http://www.geocities.com/rcwoolley/
Join the Linux Support by Small Businesses list at
http://mail.computerdatasafe.com.au/mailman/listinfo/lssb
On Mon, 2003-06-02 at 15:35, Richard Troth wrote:
I note that the zSeries clock is (800, 900, even 9672s)
is awfully accurate compared to even the newest PCs.
(Have not compared it to Sun or HP mid-range hardware.)
I'm talking about watching the drift file NTPD maintains.
It goes below 1.000
Thanks folks,
It looks like the sysplex timer offers more than just time and, in at
least a few valued opinions, the time that it keeps is probably more
accurate than I could get from an ntp solution.
Thanks again, we'll look into the used market and see if there is
something out there that might
and propagate these settings through VM to
the CTC.
We have a bunch of Linux guests doing time sync over Guest LAN directly to
an NTP server out on the 'real LAN'. This works fine.
If you're trying to sync VM's time to NTP, I don't know of a way to do
that. There is an NTP *server* for VM on the IBM
On Fri, 2003-05-30 at 16:34, Michael Morgan wrote:
All of our S/390 systems (Linux/390, VM z/OS) get the time from an
external time source..ie the IBM 9037 sysplex timer. We manually set the
time in the sysplex timer (about once a year :)) We don't care how
accurate the time is, so we've
, May 31, 2003 2:19 PM
To: [EMAIL PROTECTED]
Subject: Re: Time Sync
-snip-
Has anyone else tried this idea or is time something that just isn't all
that important to most mainframe shops?
NTP is adequate for time-stamping emails, but it isn't rigorous. IBM's solution is
intended
for restoring to point-in-time with microsecond (or better) resolution across systems.
Just because it changes your clocks for you doesn't mean it's appropriate for all
applications.
Time synch is
is probably an expensive proposition. I am being told that there
is not a way to use ntpd under one of my Linux guests to set the clock
and propagate these settings through VM to the CTC. So, if you don't
mind me asking, what solutions are commonly used for time sync?
Thanks in advance,
Steve
--
are commonly used for time sync?
In the Linux world and to an extent nowdays in the Windows world NTP
seems to be the popular system. Its an internet standard that will let
you lock your machiens to each other and to global time sources that
ultimately anchor back to atomic clocks.
xntpd is the Linux
On Fri, 30 May 2003, Steven A. Adams wrote:
I am being told that there is not a way to use ntpd under one of my
Linux guests to set the clock and propagate these settings through VM to
the CTC.
We have a bunch of Linux guests doing time sync over Guest LAN directly to
an NTP server out
, if you don't
mind me asking, what solutions are commonly used for time sync?
In the Linux world and to an extent nowdays in the Windows world NTP
seems to be the popular system. Its an internet standard that will let
you lock your machiens to each other and to global time sources
On Fri, 2003-05-30 at 15:31, Vic Cross wrote:
On Fri, 30 May 2003, Steven A. Adams wrote:
I am being told that there is not a way to use ntpd under one of my
Linux guests to set the clock and propagate these settings through VM to
the CTC.
We have a bunch of Linux guests doing time sync
]
Subject: Re: Time Sync
-snip-
Thanks Alan,
I am very familiar with ntp. My question was intended to see what others
do to sync the hardware clock on the mainframe itself. Is there an ntp
equivalent that will set and maintain the hardware clock on the z/800?
--
Thanks for the reply Mark,
Please excuse my ignorance, you can tell me I'm crazy if you like but do
you think there a possibility that we could use an ntp child on the
support element laptops and achieve time sync? Of course that would mean
that we would have to connect the laptops to the network
to set the clock
and propagate these settings through VM to the CTC. So, if you don't
mind me asking, what solutions are commonly used for time sync?
In the Linux world and to an extent nowdays in the Windows world NTP
seems to be the popular system. Its an internet standard
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