[Info-vax] Shadow System Disk between two Hosts

[Paul Sture]

On Tue, 15 May 2012 02:17:07 -0400, JF Mezei wrote:

> Christoph Gartmann wrote:
> 
>> according to the manuals it should be possible to shadow a system disk
>> between two nodes. I have to Itanium boxes, connected via ethernet and
>> forming a cluster under OpenVMS 8.4. Currently each has its own system
>> disk. Is it possible to have these disks form a shadow set and still
>> have each node boot from a single member of this disk?
> 
> Possible to shadow systen disk: yes. It is in a sysgen parameter. Early
> in the boot sequence, the system disk is converted to a single device
> shadow set device (aka DSA0:)
> 
> I don't have experience with the system device for shadow sets. I have
> to assume that once the DSA device has been formed early in boot, it is
> up to the system manager to mount other physical devices to it, at which
> point you could mount a device belonging to another node. But if that
> device is also in its own DSA0 shadow set, not sure how they can be
> combined.

And as I just found out yesterday, you want to search your logicals for 
occurrences of the original device name.  I found APACHE$ROOT hardcoded 
as $2$DKA0 in one of the startup procedures that is generated somewhere 
in APACHE$CONFIG (or similar name - I'm not in front of that system right 
now).



-- 
Paul Sture