[Info-vax] Sizing up Disks with Shadowing

[Tom Adams]

On Aug 10, 4:48 pm, Bob Gezelter <gezel... at rlgsc.com> wrote:
> On Aug 10, 2:58 pm, tadamsmar <tadams... at yahoo.com> wrote:
>
> > Can I introduce a larger disk into a shadowset?
>
> > I plan to replace 2.1 gig disks with 9 gig disks soon.
>
> > I was thinking I could do it by just putting them in the shadow set
> > and then switching the master.
>
> tadamsmar,
>
> Precisely this approach was covered in my presentation "Migrating
> OpenVMS Storage Environments without Interruption or Disruption" at
> the 2007 HP Enterprise Technology Forum. While the session was not
> audio recorded, the slides are available at:http://www.rlgsc.com/hptechnologyforum/2007/1512.html
>
> - Bob Gezelter,http://www.rlgsc.com

One thing I find confusing about the example:

$ initialize/shadow=(shadowmember1:,shadowmember2:)-
/structure=5-
/cluster=3/limit=3145728/erase shadowtest

That would destroy the disk contents, right?   Is that just there to
create the test example?   Am I suppose to issue some sort of prep
command for my shadowset?

I just ignore that step and:

1. INIT the bigger disks without worrying about /limit or any other
qualifiers. (and do media analysis of these 7 day warranty used
babies.)

1.  merge in the bigger disks

2.  dismount all the smaller disk

$ set volume/size=30000 disk$shadowtest

In which case, I never have to use the /limit qualifier.