topic Re: Daylight Savings time in Operating System - OpenVMS

Daylight Savings time

Nancy Guyette — Wed, 03 Jan 2007 09:26:19 GMT

Are there any changes to be made to Open VMS servers running 7.3-2 to have the automatic Daylight Savings Time date change run on the new date in March 2007?

Re: Daylight Savings time

Wim Van den Wyngaert — Wed, 03 Jan 2007 09:42:42 GMT

A patch to be installed (US only) : http://www5.itrc.hp.com/service/patch/patchDetail.do?patchid=VMS732_TZ-V0300&sel={openvms:alpha:7.3-2,}&BC=main|search|

Wim

Re: Daylight Savings time

EdgarZamora_1 — Wed, 03 Jan 2007 09:52:06 GMT

Yes. VMS732_TZ-V0300 can be found here in ITRC. No reboot necessary.

Re: Daylight Savings time

Duncan Morris — Wed, 03 Jan 2007 09:58:16 GMT

Hi Nancy,

welcome to the OpenVMS itrc forum!

You probably need to check firstly whether your system is set for auto daylight savings time changes

EURO> mc sysgen
SYSGEN> SH AU*
Parameter Name Current Default Min. Max. Unit Dynamic
-------------- ------- ------- ------- ------- ---- -------
AUTO_DLIGHT_SAV 0 0 0 1 Boolean
SYSGEN> HELP SYS_PAR AUTO

Sys_Parameters

AUTO_DLIGHT_SAV

AUTO_DLIGHT_SAV is set to either 1 or 0. The default is 0.

If AUTO_DLIGHT_SAV is set to 1, OpenVMS automatically makes the
change to and from daylight saving time.

You should also check that you have the appropriate patch kits for new time zones as indicated above.

Depending whether you have DTSS or NTP set up, you may have to check other steps.

You do not indicate whether you have either DECnet or TCPIP networking on these servers.

See this document for details of time setting for your system:

http://h71000.www7.hp.com/doc/732FINAL/aa-pv5mh-tk/aa-pv5mh-tk.HTMl

Regards,

Duncan

Re: Daylight Savings time

Wim Van den Wyngaert — Wed, 03 Jan 2007 10:34:32 GMT

You can of course also submit a batch job at the correct time that will change the time.

Whatever solution, you may have side effects if the application and/or VMS are not ready for it (I have looping symbionts, aborting middleware etc).

Wim

Re: Daylight Savings time

Ian Miller. — Wed, 03 Jan 2007 10:55:15 GMT

See also

http://h71000.www7.hp.com/dst.html

You may also need the current ACRTL kit.

Re: Daylight Savings time

Nancy Guyette — Wed, 03 Jan 2007 11:45:58 GMT

I have two other servers that are still running 7.1 - I have been changing them manually by running the 'daylight_savings...procedures' - will it be ok to continue doing that on these two servers without installing any patches? They are very outdated with software versions.

Re: Daylight Savings time

Duncan Morris — Wed, 03 Jan 2007 12:14:55 GMT

Hi Nancy,

there should be no problems with the older systems. As you are already handling them manually, you can continue to do so.

Duncan

Re: Daylight Savings time

Andy Bustamante — Wed, 03 Jan 2007 12:16:48 GMT

You can certainly change time manually on your older versions of VMS. As Wim points out, you can submit a batch job if your applications allow for a time change.

Andy

Re: Daylight Savings time

Anton van Ruitenbeek — Fri, 05 Jan 2007 07:19:34 GMT

Hey Nancy,

A very good alternative is to modify the older systems using DTSS and the newer systems using NTP with automatic daylight savings. I never had any problems using DTSS but the NTP version systems kept giving me headache. The last system I had, all the nodes (4) where configured the some only two of them where going alright, the other two stayed at the old time. Ofcourse you can imagine the problems this can (and will) give.

AvR

Re: Daylight Savings time

Nancy Guyette — Fri, 05 Jan 2007 11:14:08 GMT

I've seen all the responses regarding to the patch(es) that need to be installed. If I change my sysgen parameter to '0' and choose to change the time manually, will i need to install the patch(es)?

I understand that my servers running the older versions of Open VMS (7.1), I can continue to change the time manually.

Thank you.

Re: Daylight Savings time

Duncan Morris — Fri, 05 Jan 2007 11:21:43 GMT

Hi Nancy,

if you switch off automatic time changing, then there is no need to apply the patches.

You can then just use your manual procedures to alter the system time at your discretion.

Regards,

Duncan