Scan for Disks

Run the command below to scan for disks.

ioscan -fnC disk

Make your physical volume

This is the first step in the creation of a physical volume.

pvcreate -f /dev/rdsk/c0t1d0

Create the device structure using mknod

Mknon creates a FIFO, character special file, or block special file with the
specified name. You will need to do this when you are creating a volume group.

              cd /dev

              mkdir vgdata

              cd vgdata

              mknod group c 64 0x010000

What is above is only an example, your minor number will vary by machine.

     mknod [options]... NAME Type [Major Minor]

Create volume group

Using vgcreate,you need to create you volume group and list all the disks
that are to make up this volume group. In the example below we are creating a
volume group called vgdata.

                vgcreate vgdata  /dev/dsk/c0t1d0

Below is an example from one of the DCA boxes:

                 vgcreate /dev/vgapcj06 /dev/dsk/c7t2d2 /dev/dsk/c7t2d3 /dev/dsk/c7t2d4

Once created use vgdisplay to display information pertaining to your new
volume.

                 vgdisplay -v vg01

updca003(root)#vgdisplay vgapcj06

--- Volume groups ---

VG Name                     /dev/vgapcj06

VG Write Access             read/write

VG Status                   available

Max LV                      255

Cur LV                      0

Open LV                     0

Max PV                      16

Cur PV                      3

Act PV                      3

Max PE per PV               8690

VGDA                        6

PE Size (Mbytes)            4

Total PE                    26067

Alloc PE                    0

Free PE                     26067

Total PVG                   0

Total Spare PVs             0

Total Spare PVs in use      0

Create a Logical Volume

See the example below that was created with the -l option which used logical
extents to determine the size for the logical volume

updca003(root)#lvcreate -n ndata6 -l 26067 /dev/vgapcj06

Logical volume "/dev/vgapcj06/ndata6" has been successfully created with

character device "/dev/vgapcj06/rndata6".

Logical volume "/dev/vgapcj06/ndata6" has been successfully extended.

Volume Group configuration for /dev/vgapcj06 has been saved in /etc/lvmconf/vgapcj06.conf

updca003(root)#lvdisplay /dev/vgapcj06/ndata6

--- Logical volumes ---

LV Name                     /dev/vgapcj06/ndata6

VG Name                     /dev/vgapcj06

LV Permission               read/write

LV Status                   available/syncd

Mirror copies               0

Consistency Recovery        MWC

Schedule                    parallel

LV Size (Mbytes)            104268

Current LE                  26067

Allocated PE                26067

Stripes                     0

Stripe Size (Kbytes)        0

Bad block                   on

Allocation                  strict

IO Timeout (Seconds)        default

Make a filesystem

   updca003(root)#newfs /dev/vgapcj06/rndata6

   newfs: /etc/default/fs is used for determining the file system type

   version 4 layout

   106770432 sectors, 13346304 blocks of size 8192, log size 256 blocks

   unlimited inodes, largefiles not supported

   13346304 data blocks, 13345512 free data blocks

   408 allocation units of 32768 blocks, 32768 data blocks

   last allocation unit has 9728 data blocks

Other LVM Commands for HPUX

Export disk group

• vgexport /dev/disgroup

this deactivates the diskgroup

• vgchange -a n <diskgroup>

this activates a diskgroup

• vgchange -a y <diskgroup>

Grow a logical volume

• lvextend