Re: [foxboro] Very strabge incident on legacy historian

Problems like this happen when the historian informix partition is restored 
from a tape that was made with a different partition size.  Resizing the 
historian likely should have been followed by another backup.  When I was 
doing this regularly (upgrading or resizing), I would keep the historian 
backup separately and never restore the informix partition from the tape.
----- Original Message ----- 
From: "stan" <stanb@xxxxxxxxx>
To: "Foxboro List" <foxboro@xxxxxxxxxxxxx>
Sent: Saturday, December 18, 2004 11:00 AM
Subject: [foxboro] Very strabge incident on legacy historian


> Yesterday we took an AW-51B down for yearly vbackups. When it was 
> rebooted,
> the operators complaind that "ternding did not work". Investigation
> revealse that it actually did work, but only for about 243 of the ~800
> points that should have been in the historian.
>
> The historian data display revealed that the histrian thouht that only 243
> points were configured! The only thing thta looked unusual (that we found)
> was that Informix's tbchek -pe showed to physical extents overlaping.
>
> The history of this machine is that the historian wa upgraded from 500
> points to 100 a whil back when we brought in another process unit to it's
> sphere of control.
>
> We resored a tape from Septemnber to a unit in the lab, and it alos showed
> only 243 points in the historian, but it did not display the Inromix
> extenrs error.
>
> We woulnd up doing a dbitint, and alod from some older data, and got back
> most of the points.
>
> My question is, has anyone else seen this behavior? And can anyone explain
> what might have hapend?
>
> I think I will also add a historian database dump to my routine bi-weekly
> automated backups. Is anyone else doing this?
>
>
> -- 
> "They that would give up essential liberty for temporary safety deserve
> neither liberty nor safety."
> -- Benjamin Franklin
>
>
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