To have Linux Sync with the TOD of VM is there a setting in the Linux
environment or is this done automagically or do we use NTP and given VM as
a server?
Thanks!
Eric Sammons
(804)697-3925
FRIT - Infrastructure Engineering
Dave Jones <[EMAIL PROTECTED]>
Sent by: Linux on 390 Port <[EMAIL PROTECTED]>
11/05/2003 09:11 AM
Please respond to Linux on 390 Port
To: [EMAIL PROTECTED]
cc:
Subject: Re: NTP (Time Synchronization) in the Z
environment
There is a native z/VM implementation of the NTP available off of the IBM
VM
download page (http://www.vm.ibm.com/download/packages). Look for the
TIMESERV package there; it allows all of your Linux machines to sync up to
the VM TOD clock.
Dave Jones
Sine Nomine Associates
Houston
----- Original Message -----
From: "James Tison" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, November 04, 2003 9:25 AM
Subject: Re: NTP (Time Synchronization) in the Z environment
> I ntp sync my z/VM Linux guests from an external source. I have no idea
> what hardware the ntpd server is running, but I assume it's native,
> dedicated hardware. I run 'ntpdate' via cron every 30 minutes on my z/VM
> guests, and am only seeing between 1 and 4 ms corrections (randomly) at
> every interval. For those reasons, I wouldn't run my ntpd on a z/VM
guest.
> Some of the lower quality Chinese mobos I've seen on peecees don't make
for
> good ntpd servers, either. You need a very stable internal clock with
very
> little drift. Ultimately, you want to ntp sync with a server that gets
its
> value either directly or indirectly from tick or tock (.usno.navy.mil)
--
> that's fed off of the US Naval Observatory's atomic clock.
>
> --Jim--
> James S. Tison
> Senior Software Engineer
> TPF Laboratory / Architecture
> IBM Corporation
> "A bird in hand is safer than one overhead."
>
