[Info-vax] Correct way to dismount shadowed volume set as late as possible?

[Stephen Hoffman]

On 2021-03-26 00:13:20 +0000, Matthew Wilson said:

> But I can't just dismount DSA1 before running the @SYS:SYSTEM:SHUTDOWN 
> command, because it obviously has data that's in use all the way 
> through most of the shutdown process until the audit server is shut 
> down.
> Hence my question -- what is the correct way to cleanly dismount such a 
> shadow set that is needed all the way through audit server shutdown? Or 
> is there an entirely different approach I should be looking at?

In general, add the DISMOUNT commands to SYSHUTDWN_0010.COM, or for a 
later dismount during the SHUTDOWN.COM processing, add the DISMOUNT to 
SYSHUTDWN.COM, as these are invoked automatically by SHUTDOWN.COM.

For this case, you're running a VAX version of OpenVMS VAX, and AFAIK 
all versions that predates availability of SYSHUTDWN_0010.COM, so you 
won't have access to that procedure here.  The furthest back that the 
MANAGE patch got was V7.3-2, IIRC. Which means you'll be dismounting in 
SYSHUTDWN.COM.

You will want to quiesce the volume before the dismount, if there are 
still open channels.  (SHOW DEVICE /FILE ddcu: is one option to see 
what's going on just before the DISMOUNT, etc.)

You will also want to use an edited version of 
SYS$EXAMPLES:MSCPMOUNT.COM to mount and maintain volumes mounted—this 
procedure can be configured and run and operates as a detached 
process—and probably not what you're doing now with your MOUNT commands 
in SYSECURITY.COM, as MSCPMOUNT contends with cluster member hosts 
coming and going as can happen. I prefer to avoid using MOUNT /CLUSTER 
here.




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