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Conference vaxaxp::vmsnotes

Title:	VAX and Alpha VMS
Notice:	This is a new VMSnotes, please read note 2.1
Moderator:	VAXAXP::BERNARDO

Created:	Wed Jan 22 1997
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	703
Total number of notes:	3722

469.0. "UTC$CONFIGURE_TDF update SYS$TIMEZONE.DAT?" by SANITY::PCUMMINGS (The perfect democracy) Mon Apr 14 1997 15:32

    Can someone tell me why on some systems, running @UTC$CONFIGURE_TDF.COM
    will create or update a file called SYS$SYSTEM:SYS$TIMEZONE.DAT and
    others it ONLY defines/updates the logical SYS$TIMEZONE_DIFFERENTIAL.
    
    I thought it would do BOTH on all OpenVMS systems. Answers, anyone?
    I've seen it update the logical AND the file on some V6.1, v6.2 and V7.1
    systems, but not all.
    
    /paul

T.R	Title	User	Personal Name	Date	Lines
469.1	probably the expected behavior	EVMS::GRANT		`Thu Apr 17 1997 15:21`	3
	The first few releases on Alpha we did not write the .DAT file. As of V7.0 we do. I'd have to go look at the code to refresh my memory on the details.
469.2	where does it store the info?	SANITY::PCUMMINGS	The perfect democracy	`Fri Apr 18 1997 16:22`	10
	If it didn't write the information to the .DAT file, where did it store the information so that the system would know what the timezone differential information was on a reboot? It seemed to me that the SYS$TIMEZONE.DAT file was used for the system on reboot. thanx /paul
469.3	had to reset after reboot	HNDYMN::MCCARTHY	A Quinn Martin Production	`Fri Apr 18 1997 20:26`	5
	>> differential information was on a reboot? It didn't - IE it was a bug. bjm
469.4	no .dat file a bug?	BLKRUS::PCUMMINGS	The perfect democracy	`Sun Apr 20 1997 10:38`	6
	Tell me more. Is this "bug" documented anywhere? If this is a bug, what's the workaround or fix ? thanx /paul
469.5		AUSS::GARSON	DECcharity Program Office	`Sun Apr 20 1997 20:14`	7
	re .4 Presumably the workaround is that one invokes the command procedure in the system startup... Presumably the fix is that one upgrades to a more recent version of VMS...
469.6	TDF is now mandatory	EVMS::GRANT		`Mon Apr 21 1997 18:06`	11
	Prior to 7.0 VMS did not require a TDF to be set and therefore did not save it over a reboot. Any application using TDF was on its own as far as establishing, preserving, etc. As of 7.0 VMS requires a valid TDF because the CRTL depends on its existence, hence the writing to the .DAT file. (VMS used to preserve it on VAX but this was not originally ported to Alpha because it was not necessary at the time.)
469.7	NTP uses UTC offsets	SANITY::PCUMMINGS	The perfect democracy	`Tue Apr 22 1997 14:58`	8
	RE: "Any application using TDF was on its own" The application I'm speaking of is UCX NTP. It requires that the SYS$TIMEZONE_DIFFERENTIAL be defined to match the timezone with which the system lives in order to sync time appropriately. /paul
469.8	my mistake	EVMS::GRANT		`Wed Apr 23 1997 13:39`	10
	Sorry.... I was wrong in .6, tried to do too much from memory without looking at the code which I have now done. Prior to 7.0 on Alpha we wrote the TDF to SYS$BASE_IMAGE.EXE. While working on the TDF stuff for 7.0 we changed that behavior to match what is done on VAX, that is writing the .DAT file. Hopefully VMS behaves the same on both platforms now. The real need in 7.0 was to guarantee a valid TDF which we did not do in previous releases on either platform.