Hp Unix LVM Commands

# extendfs : To Extend a file system.
# lvmadm : Display the limit associated with the volume group version.
# lvchange : Change the attribute of a logical volume.
# lvcreate : To create a logical volume.
# lvdisplay : To display information about a logical volume.
# lvextend -m : Add a mirror to a logical volume.
# lvextend -L : Increase the size of the logical volume.
# lvlnboot : Prepares a logical volume to become a root, swap, dump area.
# lvmerge : Merge the split logical volumes.
# lvmove : Migrate a logical volume to a new disk.
# lvreduce -L : Reduce the size of the logical volume.
# lvreduce -m : Reduce the number of mirror copies of a logical volume.
# lvremove  : Remove a logical volume.
# lvrmboot : Removes a logical volume link to root, swap, dump.
# lvsplit : Split a mirrored logical volume into two logical volumes.
# lvsync : Syncronize the stale logical volume.

Need of PVID, UDID and IEEE

To export a physical volume as a virtual device, the physical volume must have an IEEE volume attribute, a unique identifier (UDID), or a physical identifier (PV ID).

Physical Volume Identifiers

A physical volume in an AIX Box (hdisk#) could be identified with Physical Volume ID, UDID (Unique Device Identifier), IEEE Identifier.

PVID : 32 Digit Identified on which the first 16 Digit remains the same on all the Physical Volumes and the remaining 16 Digit vary among the physical volumes.

UDID : This is value that is assigned to the physical volumes that are managed by MPIO.

$ chdev -dev hdisk# -verbose : Command to view the PVID, UDID and IEEE ID for a physical volume.

# lsattr -EHl hdisk# : Command to view the PVID and UDID for a disk.

$ chkdev -dev hdisk1 -verbose

NAME:                hdisk1
IDENTIFIER:          210ChpO-c4HkKBc904N37006NETAPPfcpPHYS2VIRT_CAPABLE:   YES
VIRT2NPIV_CAPABLE:   NA
VIRT2PHYS_CAPABLE:   NAPVID:                00c58e40599f2f900000000000000000
UDID:                2708ECVBZ1SC10IC35L146UCDY10-003IBXscsi
IEEE:
VTD:PHYS2VIRT_CAPABLE:  Shows that the resource could be virtualized.
VIRT2NPIV_CAPABLE:  Shows that the resource is N-Port Virtualization supportive.
VIRT2PHYS_CAPABLE :  Shows the resource could be used as a physical object.

Volume Group Operation in AIX and HP_UNIX

HP_Unix:

1) #  vgdisplay <volume group name> : Display information about the volume group.

2) # vgdisplay -v <volume group name> : Display more detailed information on the volume group.

3) # vgchange -a y /dev/<VG name> : To activate a volume group.

4) # vgchnage -a n /dev/<VG name> : To deactivate a volume group.

5) # vgexport  /dev/<VG name> : To remove a volume group.

6) # vgimport /dev/<VG name> : To import an exported volume group.

IBM AIX:

1) # lsvg : List all the volume groups.

2) # lsvg -o : List all the active volume groups.

3) # lsvg <volume group name> : Information about the Volume group.

4) # lsvg -l <volume group name> : Information about the logical volumes in the volume group.

5) # lsvg -p <volume group name> : Information about the physical volumes in the volume group.

6) # lsvg -m <volume group name> : Information about the mirroed volume group.

7) # varyoffvg <volume group name> : To deactivate a volume group.

8) # varyonvg <voluume group name> : To activate a volume group.

9) # exportvg  <voluume group name> : To remove a volume group.

10) # importvg <voluume group name> : To import a volume group.

Volume Group Creation in HP_Unix and IBM AIX

HP-UNIX:

1) # ioscan -funC disk : Locate the disk you want to use for the creation of volume group.

2) # strings /etc/lvmtab : Shows the physical volumes that are part of LVM.

3) For Hp Unix Version 11:

We need to create a device file called "group" for the volume group which we are about create. The "group" file is a character based file with the major  "64" default for Hp_ux and minor number of out choice "0x010000"

# cd /dev/

# mkdir <volume group name>

# chown root:root <volume group name>

# chmod 755 <volume group name>

# cd /volumegroup name

# mknod /dev/volume group name/group c 64 0x010000

# chown root:sys group

# chmod 755 group

4) # pvcreate /dev/rdsk/c#t#d# : PV creation.

5) # vgcreate -s <PE size> /dev/<volume group name> /dev/dsk/c#t#d#

6) # vgdisplay : View the volume group created.

7) # strings /etc/lvmtab : Verify the same.

AIX:

1) # cfgmgr

2) # lspv :  Select the physical volumes in the none state.

3) # mkvg -y <volume group name> -s <PP size> <Physical volumes....>

4) # lsvg  : List all the volume group.

5) # cd /etc/vg/

6) # ls -l : Verify a "Zero Byte" file is created with the prefix "vg.<VG ID>" has been created..

Adding and Removing a Device in AIX and HP_UNIX

AIX: # cfgmgr :  Execute configuration manager.

HP_UNIX: # ioscan : Running hardware scan on the box.

AIX:  # rmdev -dl <Device name> : Command to remove a device.

HP_UNIX: # rmsf -a <Device path (/dev/dsk/c2t0d0)

AIX: # mkdev -l <Device name> : To bring the device active or # cfgmgr.

HP_UNIX: # insf -e and then run # ioscan

AIX : # lsdev -Cc <Class> -d <Device name> -F Parent : View the parent of the device.

HP_UNIX: # ioscan

LVM in IBM AIX and HP UX

Volume Group Creation:

# mkvg -y <VG name> -s <Size of PP> <Physical Volumes>  : AIX

# vgcreate -n <VG name> <Physical Volumes> : HP_UX

Physical Volume Creation:

# mkdev -l hdisk# : Intialize a physical volume : AIX

# pvcreate /dev/rdsk/c#t#d# : Create a physical volume : HP_UX

Logical Volume Creation:

# mklv -t  <Filesystem type> -y <Logical volume name> <Volume group name> <No.of PP's>  <Physical Volume Name> : AIX

# lvcreate -L <Size in MB> -n <Logical volume name> <Volume group name with the location> : HP_UX

File System Creation:

# crfs -v <Filesystem type> -d <Logical volume name> -m <Mount point> -A y/n : AIX

# newfs -F vxfs <Location of a Raw Logical volume name> : HP_UX

Mount Point:

# mount <Logical Volume Name> <Mount Point> : Same in AIX and HP_UX.