[Info-vax] booting on a single disk from a shadowset

[Phillip Helbig undress to reply]

In article <ba8cf374-2a87-49da-b8a9-8901a2ac853e at googlegroups.com>, Tom
Adams <tadamsmar at gmail.com> writes: 

> On Friday, February 12, 2016 at 3:08:55 AM UTC-5, Phillip Helbig (undress to reply) wrote:
> > In article <Z4NC8wkAhles at eisner.encompasserve.org>,
> > koehler at eisner.nospam.decuserve.org (Bob Koehler) writes: 
> > 
> > > In article <94e01af7-f13e-4387-bc85-5d6bc76f3f83 at googlegroups.com>, Tom Adams <tadamsmar at gmail.com> writes:
> > > > 
> > > > The question is: Is there a quick way to get the system to book as a 
> > > > shadow-set on dka100 when dka0 (the master member) is gone?
> > > 
> > >    Change the dip switch (or whatever) that sets the unit number?
> > 
> > Better: put both members in BOOTDEF_DEV.  This also takes care of the 
> > case that one of the members has died---it can then boot from the other 
> > one automatically.
> 
> Do you also need to put both members in BOOT_DEV?

As long as both are there, no.  It will boot from the one in BOOTDEF_DEV 
and the other member will be added during boot.  If the primary member 
fails, then it won't boot from the other one.  However, you can always 
boot from the other one by specifying it in the boot command.  It is 
BOOTDEF_DEV, where DEF is default.