Create a LUN from storage and present to the server on which you want to assign a new mount point. To detect new LUN on the server use below command, it will show you all disks presented to the server till now.
Here:
f:- Generate a full listing, displaying the module's class, instance number, hardware path, driver, software state, hardware type, and a brief description.
n:- Generate a full listing, displaying the module's class, instance number, hardware path, driver, software state, hardware type, and a brief description.
C:- strict the output listing to those devices belonging to the specified class.
N:- Display the agile view of the system hardware.
Below command shows the difference between persistent DFS and Legacy DSF. In next steps we are going to use persistent DSF.
#ioscan –m dsf
Persistent DSF Legacy DSF(s)
========================================
/dev/pt/pt4 /dev/rscsi/c0t0d0
/dev/rscsi/c2t0d0
/dev/rscsi/c4t0d0
/dev/rscsi/c6t0d0
/dev/rdisk/disk41 /dev/rdsk/c1t0d0
/dev/rdsk/c3t0d0
/dev/rdsk/c5t0d0
/dev/rdsk/c7t0d0
/dev/rdisk/disk42 /dev/rdsk/c1t0d1
/dev/rdsk/c3t0d1
/dev/rdsk/c5t0d1
/dev/rdsk/c7t0d1
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To find which disks are not used in the LVM.
#pvdisplay –l /dev/disk/*
/dev/disk/disk41:LVM_Disk=no
/dev/disk/disk42:LVM_Disk=yes
/dev/disk/disk43:LVM_Disk=yes
/dev/disk/disk44:LVM_Disk=yes
/dev/disk/disk45:LVM_Disk=yes
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From the above output we are able to find disk41 is not used in LVM. So we proceed with disk41. And cross check with the size of disk.
#diskinfo /dev/rdisk/disk41
SCSI describe of /dev/rdisk/disk41:
vendor: HP
product id: OPEN-V
type: direct access
size: 56691712 Kbytes
bytes per sector: 512
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Output suggests that it is the same size of disk for which we are looking for. So proceed to next step.
Create Physical volume(PV)
A disk has to be initialized before LVM can use it.
#pvcreate /dev/rdisk/disk41
Physical volume "/dev/rdisk/disk41" has been successfully created.
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If disk41 already initialized before then you will get below error message
# pvcreate: The Physical Volume already belongs to a Volume Group
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If you are sure the disk is free you can force the initialization using the -f option:
#pvcreate –f /dev/rdisk/disk41
Create Volume Group(VG)
Select a unique minor number for the VG:
# ll /dev/*/group
crw-r--r-- 1 root sys 64 0x000000 Apr 4 2010 /dev/vg00/group
crw-r--r-- 1 root sys 64 0x010000 Oct 26 15:52 /dev/vg01/group
crw-r--r-- 1 root sys 64 0x020000 Aug 2 15:49 /dev/vg02/group
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Create the VG control file (group file):
# mkdir /dev/vg03
# mknod /dev/vg03/group c 64 0x030000
Create the VG
#vgcreate -s 256 /dev/vg03 /dev/disk/disk41
Volume group "/dev/vg03" has been successfully created.
Volume Group configuration for /dev/vg03 has been saved in /etc/lvmconf/vg03.conf
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s: Size of physical extend(PE) in MB.
If you have 2 or more PV to add in a VG, you can add them in one go, just adding next to disk41 with a space.
#vgcreate –s 256 /dev/vg03 /dev/disk/disk41 /dev/disk/disk40
To display VG information
#vgdisplay -v /dev/vg03
--- Volume groups ---
VG Name /dev/vg03
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 1
Open LV 1
Max PV 16
Cur PV 1
Act PV 1
Max PE per PV 1727
VGDA 2
PE Size (Mbytes) 256
Total PE 216
Alloc PE 0
Free PE 216
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 1.0
VG Max Size 6908g
VG Max Extents 27632
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Create Logical Volume(LV)
To create a LV from a VG (option: L- assigns Size in MB; l - Assigns size in Number of PE, n – assigns name to LV)
# lvcreate -L 55040 –n /dev/vg03/lvol1 /dev/vg03
Logical volume "/dev/vg03/lvol1" has been successfully created with character device "/dev/vg03/lvol1"
Logical volume "/dev/vg03/lvol1" has been successfully extended.
Volume Group configuration for /dev/vg03 has been saved in /etc/lvmconf/vg03.conf
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To display LV information
# lvdisplay -v /dev/vg03/lvol1
--- Logical volumes ---
LV Name /dev/vg03/lvol1
VG Name /dev/vg03
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 55040
Current LE 215
Allocated PE 215
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default
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Create File system
You can use newfs to put a FS onto the LV:
# newfs -F vxfs /dev/vg03/rlvol1
F: - File system type either hfs or vxfs. Nowadays it is always recommended to use a VxFS (=JFS) filesystem.
Mount File system
Mounting created File System
#mkdir /data
#mount /dev/vg03/lvol1 /data
Use the bdf command to see the mounted file systems
#bdf
Entries in /etc/fstab file
Make entries in /etc/fstab file to make mount point permanent between reboots. You can do this with below command or open this file with vi editor and add entries at the end.
# echo “/dev/vg03/lvol1 /data vxfs defaults 0 2” >> /etc/fstab
#vi /etc/fstab
# System /etc/fstab file. Static information about the file systems
# See fstab(4) and sam(1M) for further details on configuring devices.
/dev/vg00/lvol3 / vxfs delaylog 0 1
/dev/vg00/lvol1 /stand vxfs tranflush 0 1
/dev/vg00/lvol4 /home vxfs delaylog 0 2
/dev/vg00/lvol5 /opt vxfs delaylog 0 2
/dev/vg00/lvol6 /tmp vxfs delaylog 0 2
/dev/vg00/lvol7 /var vxfs delaylog 0 2
/dev/vg00/lvol8 /usr vxfs delaylog 0 2
/dev/vg03/lvol1 /data vxfs defaults 0 2
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