[Info-vax] Uptime for OpenVMS

[Paul Sture]

In article <iqrbpt$utk$1 at usenet01.boi.hp.com>,
 "Robert A. Brooks" <rab at aitchpee.com> wrote:

> On 5/13/2011 10:35 PM, Michael Moroney wrote:
> > JF Mezei<jfmezei.spamnot at vaxination.ca>  writes:
> 
> >> Doesn't it also check to properly close files (and update various
> >> pointers) that were not closed if the disk was improperly dismounted ?
> >> If that is not "mount verification", what is that process called ?
> >
> > Mount Verify gets invoked if a drive goes offline when trying to do I/O
> > to it.  It attempts to bring the disk back online, including alternate
> > path searches (DU/MSCP),
> 
> Similar to DUDRIVER "connection walking", Multipath for fibre channel 
> and SCSI devices is invoked as part of mount verification.
> 
> It's kinda fun to look at [SYS]MOUNTVER.MAR from VAX/VMS V1.0 and see
> how simple it was, compared to the complexity of what happens today, 
> which isn't even the full story, as other areas play a role in mount 
> verification (DKDRIVER, SHDRIVER for shadow sets).
> 

I believe it was Larry Kilgallen who related the tale of how mount 
verification came into being.  IIRC the tale went that a new and junior 
member of VMS Engineering took a disk out without dismounting it first, 
causing some disruption.  Instad of being screamed at, the offender got 
told to address the problem, and mount verification was the outcome.

I'm reasonably sure the tale was related here on c.o.v, but Google isn't 
forthcoming.

-- 
Paul Sture