I found the following on the Electronic Support Center at HP.COM:

Title       : How to convert a private volume to a system volume on MPE/XL
Date        : 19900720
Type        : EN
Document ID : W1486447

Problem Description

I have two MPE/XL systems at my site.  I want to bring over a disc
drive from one machine to another.  The disc is currently being
used as a private volume.  I want to use it on the other machine
as a system volume.  What steps do I need to do to move the
private volume from machine A to machine B?

Solution

To convert the private volume on machine A to a system volume on
machine B, follow the steps below:

     1.  Deconfigure the private volume from machine A.

     2.  Configure the disc as a system disc on machine B.

     3.  Do a DSTAT ALL on machine B.

     :dstat all
       LDEV-TYPE    STATUS      VOLUME (VOLUME SET - GEN)
      -----------  ---------   ---------------------------
       1-079350     MASTER      MEMBER1         (MPEXL_SYSTEM_VOLUME_SET-0)
       2-079350     MEMBER      PVVOL1          (USER_VOLUME_SET-0)

     4.  Do a VSCLOSE on the set name.  VSCLOSE USER_VOLUME_SET.

     5.  Go into VOLUTIL.

     :volutil
     Volume Utility A.01.01 (C) Hewlett-Packard Co, 1987. All Rights
Reserved

     volutil: Use SCRATCHVOL to remove volume set information:
     SCRATCHVOL xx (where xx is the LDEV number)

Then, use the VOLUTIL NEWVOL command to initialize the new volume:

     NEWVOL MPEXL_SYSTEM_VOLUME_SET:membername ldev=xx 80 80

and:

Title       : How do I remove a user volume from the system
Date        : 19950411
Type        : EN
Document ID : JV9204231649

Problem Description

I would like to remove a user volume from the system, what do I do?

Solution

To remove a user volume from the system do the following:
Let's assume we would like to remove ldev#2 out of a set of 3 drives.
(Ldevs #2, 3, 4)

There are no commands available to simply delete the volume. It will be
necessary to "reload" the entire volume set, because the volume you are
removing may contain nodes and file label entries for the rest of the
set.

Example:

    1) :STORE @[log in to unmask]@;*T;DIRECTORY;ONVS=user_set

    2) :VSCLOSE user_set

    3) Remove the path for the discs from SYSGEN using dp:
       sysgen> io
       dpath (dp)      path        = device path

    4) :VOLUTIL
        volutil> SCRATCHVOL 2
        volutil> SCRATCHVOL 3
        volutil> SCRATCHVOL 4

    5) To add the  volumes in as system volumes do the following
        for each drive, annotating the desired member name and ldev #

       :VOLUTIL
        volutil> NEWVOL MPEXL_SYSTEM_VOLUME_SET:membername ldev=# 80 80

    6) Restore all of the previously stored user files:

       :RESTORE *T;@[log in to unmask]@;DIRECTORY

Good Luck!  And as always, have 2 SLT's and 2 Fullbackups on hand.  (Just my
own personal standard of protection)

Howard



> -----Original Message-----
> From: Stan Sieler [SMTP:[log in to unmask]]
> Sent: Friday, March 12, 1999 4:22 PM
> To:   [log in to unmask]
> Subject:      Re: Moving Disc to Sys Vol Set
>
> Don asks:
> > looking at length through the manuals.  Nowhere can I find info on
> removing
> > a disc drive from the private volume set or deleting the private volume
> set.
> > Can anybody give me some guidance?  Thanks!
>
> You can't do it.
>
> A volume cannot be removed from a volume set, sorry.
>
> --
> Stan Sieler                                          [log in to unmask]
>                                      http://www.allegro.com/sieler.html