Greetings; I think this subject has gone around several times already.
The VM time server is only a solution as long as you are isolated from the Rest Of the World. When you start talking to systems outside your LAN you really should be synching all of your system clocks to UTC (See: http://www.time.gov/about.html ) This makes it much easier to troubleshoot related events. From experience, as little as 9 seconds difference in time makes troubleshooting difficult, 90 secs can make it impossible! I think this is a necessary addition to the S/390; the ability to set the system clock programatically without having to IPL and not having to manually enable the operation. I know there are clever ways to do this by manipulating the time zone in VM but that really isn't a practical solution. The time needs to be checked frequently and adjusted as needed so all systems are as close to being on the same tick as possible. The software for doing this has been available for PCs and other HW for quite some time and could probably be quickly ported to z/VM and z/OS if the mechanical problem were out of the way. Good Luck! Dennis Aria Bamdad <[EMAIL PROTECTED]> on 01/14/2002 08:07:24 AM Please respond to Linux on 390 Port <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: (bcc: Dennis Wicks/infosvcs/CDG) Subject: Re: VM and Linux time of day On Fri, 11 Jan 2002 17:02:16 -0600 Dennis G. Wicks said: >Greetings; > >Linux will set its clock like any well behaved system. If you can and >want to you can set up the usual ntp (Network Time Protocol) functions >and synchronize your linux machines time to the rest of the world. This >requires internet access, which is where the "can" comes in. Or you can >get the time from a time server on your lan. > >Unfortunately, VM and OS can't do this yet. Unless something has been >quietly added in z/VM. I think there is a time server available, but I >haven't investigated it. > There is a time server available for VM. It is free to download at the VM web site www.vm.ibm.com under the download directory. I have been using it to set the time on other systems at my organization and it works well. Aria >As for the difference between your VM host and the linux guest there are >many possibilities. Choose whether to synchronize to VM or to ROW, >use a date command to set your linux clock and be happy! ;-) > >Good Luck! >Dennis > > > > > >Jean Bedard <[EMAIL PROTECTED]> on 01/11/2002 03:16:46 PM > >Please respond to Linux on 390 Port <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] >cc: (bcc: Dennis Wicks/infosvcs/CDG) >Subject: VM and Linux time of day > > > > > >Hi, > >I'm a bit confused here. I thought Linux (SuSE Linux in this case) took the >date and time from VM (or from the hardware), but now I realize that on my >zVM 4.2 system, CP QUERY TIME is currently about 90 seconds ahead of the >results of the Linux "date" command. How can it be? >-- >* Jean Bedard >* VM System Manager S.I.T., Universite Laval >* [EMAIL PROTECTED] (418) 656-2131 ext. 4014
