I used a rexx exec to send commands to the console (secuser) that looked like this:
/**/ address command "CP SEND ZLA226 date +'%d/%m/%Y %H:%M:%S:%6N'" address command "CP SEND ZLA247 date +'%d/%m/%Y %H:%M:%S:%6N'" I would expect ZLA247's to be a bit later, but sometimes it shows earlier. 18:04:34 20/07/2016 18:04:34:735597 18:04:34 20/07/2016 18:04:34:737365 18:06:42 20/07/2016 18:06:42:317457 18:06:42 20/07/2016 18:06:42:325410 18:08:50 20/07/2016 18:08:50:473232 18:08:50 20/07/2016 18:08:50:467567 18:13:51 20/07/2016 18:13:51:055624 18:13:51 20/07/2016 18:13:51:037563 Hmm. -----Original Message----- From: Linux on 390 Port [mailto:[email protected]] On Behalf Of Michael Harding Sent: Wednesday, July 20, 2016 2:47 PM To: [email protected] Subject: Re: [LINUX-390] Back to the future? In the guests' VMDBKs, in the SIEBK is stored the offset from the hardware clock that gets loaded when the guest is run. I don't recall the offset in the block. Unless that's different they should both be seeing the same CPU clock. -- Mike Harding z/VM System Support /sp Linux on 390 Port <[email protected]> wrote on 07/20/2016 01:42:05 PM: > From: Marcy Cortes <[email protected]> > To: [email protected] > Date: 07/20/2016 01:42 PM > Subject: Back to the future? > Sent by: Linux on 390 Port <[email protected]> > > So we have some servers that pass timestamps around to see how long > they have to do something before throwing in the towel. > > They've recently put in some logging to debug some errors and have > found some cases of going back in time. > > TmsSent 2016-07-20 07:40:07.000034 | TrapRx 2016-07-20 07:40:06.000944 > > So back in time by nearly a second (.99909). > > These 2 servers are on the same VM system. Both run NTP. > We know things get really out of whack without NTP. We had a bug > where it didn't start and things got really confused. > > Could NTP be misbehaving? It was just patched. How can I prove > that the clocks on the 2 servers have a different time so that I can > ascertain if it is NTP or something else. > > > > Marcy > > > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
