You may provide feedback on this document

View the printer friendly version of this document

How can a second copy of my existing root volume group be created, so that
larger logical volumes are created, while maintaining all of the current
configuations?   What are the steps?

     Migrating to New Root Disk with /stand on It's Own Logical Volume
 *************************************************************************

This document is a quick reference to migrating to a new root disk/VG with
/stand broken out on it's own Logical Volume.  It is intended for HP-UX
series 9000 system administrators running HP-UX version 10.20 and above.

1) Prepare Disk for LVM: pvcreate -B /dev/rdsk/c0t6d0

2) Create Volume Group:
   a. Make directory for Volume Group: mkdir /dev/vgroot
   b. Make Volume Group group file: mknod /dev/vgroot/group c 64 0x010000

    NOTE: The minor number, 0x010000 in this case, must be unique.
          Use ll /dev/*/group to check minor numbers currently in use.

    c. Create Volume Group:  vgcreate /dev/vgroot /dev/dsk/c0t6d0

3) Activate Volume Group: vgchange -a y /dev/vgroot

4) Add LIF Area to Disk: mkboot /dev/rdsk/c0t6d0

5) Add AUTO File to LIF:
     mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c0t6d0

6) Create Logical Volumes: 
   lvcreate -L 48 -C y -r n -n stand /dev/vgroot
   lvcreate -L 100 -C y -r n -n swap /dev/vgroot
   lvcreate -L 84 -C y -r n -n root /dev/vgroot
   lvcreate -L 200 -n usr /dev/vgroot
   lvcreate -L 300 -n var /dev/vgroot
   lvcreate -L 60 -n opt /dev/vgroot
   lvcreate -L 100 -n tmp /dev/vgroot
   .... (one lvcreate command for each existing logical volume) 

NOTE: The order of the Logical Volumes is important.  /stand's Logical
      Volume must be extended first, followed by primary swap and the
      Logical Volume for /.  The order of the remaining Logical Volumes
      does not matter.  Use pvdisplay -v, under "Distribution of
      physical volume section, to determine the Logical  Volume order on the
      the original root disk.

      The size of any of the volumes can be increased or decreased when doing
      the above lvcreates.  The -L argument to lvcreate(1m) is
      is used to specify the size in Mb.

7) Create filesystems and Copy Data to Appropriate Logical Volumes:
   a.) Use newfs on each logical volume.

NOTE: filesystem for /stand must be an HFS filesystem.  All others can be
either HFS or JFS(vxfs).

             newfs -F hfs /dev/vgroot/rstand
             newfs -F vxfs /dev/vgroot/rroot
             newfs -F vxfs /dev/vgroot/rusr
             newfs -F vxfs /dev/vgroot/rtmp
             newfs -F vxfs /dev/vgroot/rhome
             newfs -F vxfs /dev/vgroot/rtmp
             newfs -F vxfs /dev/vgroot/rvar
             .... (one newfs command for each logical volume) 

   b.) Copy Data for each logical volume.

   mkdir /newroot
   mount /dev/vgroot/root /newroot
   cd /;find / -xdev -print | cpio -pdmvux /newroot

   mount /dev/vgroot/stand /newroot/stand
   cd /stand;find . -xdev -print | cpio -pdmvux /newroot/stand

NOTE: If existing root disk does not have /stand on it's own Logical Volume
      do only one cpio command after mounting both the / and /stand Logical
      Volumes.

   mount /dev/vgroot/usr /newroot/usr
   cd /usr;find . -xdev -print | cpio -pdmvux /newroot/usr

   mount /dev/vgroot/var /newroot/var
   cd /var;find . -xdev -print | cpio -pdmvux /newroot/var

   mount /dev/vgroot/opt /newroot/opt
   cd /opt;find . -xdev -print | cpio -pdmvux /newroot/opt

   mount /dev/vgroot/tmp /newroot/tmp
   cd /tmp;find . -xdev -print | cpio -pdmvux /newroot/tmp

   mount /dev/vgroot/home /newroot/home
   cd /home;find . -xdev -print | cpio -pdmvux /newroot/home

   Include each logical volume in the root VG........


8) Edit /newroot/etc/fstab to mount /dev/newroot Logical volumes to /, /home,
/var etc..

   Example:  Change the /newroot/etc/fstab from:

   /dev/vg00/lvol3 / vxfs delaylog 0 1
   /dev/vg00/lvol1 /stand hfs defaults 0 1
   /dev/vg00/lvol4 /tmp vxfs delaylog 0 2
   /dev/vg00/lvol5 /home vxfs delaylog 0 2
   /dev/vg00/lvol6 /opt vxfs delaylog 0 2
   /dev/vg00/lvol7 /usr vxfs delaylog 0 2
   /dev/vg00/lvol8 /var vxfs delaylog 0 2

   To:

   /dev/vgroot/root / vxfs delaylog 0 1
   /dev/vgroot/stand /stand hfs defaults 0 1
   /dev/vgroot/tmp /tmp vxfs delaylog 0 2
   /dev/vgroot/home /home vxfs delaylog 0 2
   /dev/vgroot/opt /opt vxfs delaylog 0 2
   /dev/vgroot/usr /usr vxfs delaylog 0 2
   /dev/vgroot/var /var vxfs delaylog 0 2


9) Update Boot Data Reserve Area.

  lvlnboot -b /dev/vgroot/stand /dev/vgroot
  lvlnboot -r /dev/vgroot/root /dev/vgroot
  lvlnboot -s /dev/vgroot/swap /dev/vgroot
  lvlnboot -d /dev/vgroot/dump /dev/vgroot


NOTE: lvlnboot -d is not required. If no Dump Device is specified then
      it will default to the Primary Swap Device specified by lvlnboot -s.

10) Correct the /newroot/stand/bootconf to contain the new boot device file.

Example: Change /newroot/stand/bootconf from:
 l /dev/dsk/c0t6d0 
To:
 l /dev/dsk/c2t5d0 

11) Resyncronize the Boot Data Reserved Area

    lvlnboot -R /dev/vgroot

12) Boot from new Disk
    a. reboot
    b. Interrupt Boot Sequence
    c. Boot From Hardware Path of New Boot Drive
       Use lssf /dev/dsk/c0t6d0 to get Hardware Path before reboot if
       needed.

  NOTE:  Interacting with ISL should not be required.  The exact steps for
  the above will vary depending on your computer model.  Consult your
  Owners Manual for details.  This process assumes that you have obtained
  the hardware path for the mirrored boot drive using ioscan or lssf
  commands.

  If any problems are encountered when booting from the new boot disk, then
  boot from the original root disk and troubleshoot from there.  This procedure
  makes no changes to the original root volume group.

For additional information see the appropriate manpage.
example: man 1m pvcreate.

More information about LVM and other LVM procedures are available in the
HP-UX System Administration Tasks manual.  man manuals will give you
ordering information and part numbers.

Most HP documentation is available online at "http://www.docs.hp.com".

ALT KEYWORDS