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Article ID: 137
by: Reese K.
Posted: 16 Oct, 2013
Last updated: 21 Oct, 2013
Views: 561
Create a Logical Volume using Linux LVM
This example uses a local hard disk to create a logical volume.
1. partition the disk as normal using fdisk. I new the fdisk options ahead of time from having done this before.
EDS etldev1 ~ # FDISK_CMDLIST=”n\np\n1\n\nt\n8e\nw\n”
EDS etldev1 ~ # echo -e -n “${FDISK_CMDLIST}” | ( fdisk /dev/sdc )
This is the same thing as doing it from the fdisk menu as follows:
EDS etldev1 ~ # fdisk /dev/sdc
WARNING: DOS-compatible mode is deprecated. It’s strongly recommended to
switch off the mode (command ‘c’) and change display units to
sectors (command ‘u’).
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-17769, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-17769, default 17769):
Using default value 17769
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
2. Initialize the partition for use by LVM using pvcreate.
3. Create a volume group using the block device specified in pvcreate
4. Create a logical volume in the volume group from step 3
Steps 2, 3, 4 are illustrated below
EDS etldev1 ~ # pvcreate /dev/sdc1
Physical volume “/dev/sdc1” successfully created
EDS etldev1 ~ # vgcreate vg_dwstore /dev/sdc1
Volume group “vg_dwstore” successfully created
EDS etldev1 ~ # vgs
VG #PV #LV #SN Attr VSize VFree
vg_dwstore 1 0 0 wz–n- 136.11g 136.11g
vg_etldev1 1 8 0 wz–n- 135.62g 124.00m
vg_etldev1_data 1 1 0 wz–n- 136.12g 0
EDS etldev1 ~ # lvcreate -L 136.11g -n lv_dwstore vg_dwstore
Rounding up size to full physical extent 136.11 GiB
Logical volume “lv_dwstore” created
EDS etldev1 ~ # mkfs.ext4 /dev/vg_dwstore/lv_dwstore
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
8921088 inodes, 35681280 blocks
1784064 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
1089 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 39 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
EDS etldev1 ~ #
EDS etldev1 ~ # mkdir /dwstore
EDS etldev1 ~ # mount /dev/vg_dwstore/lv_dwstore /dwstore
EDS etldev1 ~ # df -Ph /dwstore
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_dwstore-lv_dwstore 134G 188M 127G 1% /dwstore
EDS etldev1 ~ #
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