[Info-vax] SYS$TIMEZONE.DAT

[Stephen Hoffman]

On 2015-03-16 10:15:06 +0000, Paul Sture said:

> Hoff alluded to this the other day in his mention of how VMS handles 
> time zones and what happens at a daylight saving time change.  This is 
> a much deeper problem for VMS.

Technically, all members of a cluster must be configured to use the 
same timezone.  Probably technically also configured for the same DST 
settings, too.   That's AFAIK the only constraint.  Beyond that, the 
further skewed the time is across the cluster, the more problems 
there'll be.   Beyond Paul's reference to batch-related problems, 
DECset CMS will start reporting errors at ~30 seconds of skew, for 
instance.  Logs and audits become increasingly difficult to match up, 
and folks that erroneously used a localtime timestamp as an increasing 
serial number will have issues with cluster shared files beyond the 
mess DST causes, obviously.  It would not surprise me that there are 
additional issues that will arise with larger skews and with specific 
products.


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