A Beginner's Guide To LVM [2/9]
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from: https://www.howtoforge.com/linux_lvm_p2
Now let's create our volume group fileserver and add/dev/sdb1 - /dev/sde1 to it:
vgcreate fileserver /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
server1:~# vgcreate fileserver /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
Volume group "fileserver" successfully created
Let's learn about our volume groups:
vgdisplay
server1:~# vgdisplay
--- Volume group ---
VG Name fileserver
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 4
Act PV 4
VG Size 93.14 GB
PE Size 4.00 MB
Total PE 23844
Alloc PE / Size 0 / 0
Free PE / Size 23844 / 93.14 GB
VG UUID 3Y1WVF-BLET-QkKs-Qnrs-SZxI-wrNO-dTqhFP
Another command to learn about our volume groups:
vgscan
server1:~# vgscan
Reading all physical volumes. This may take a while...
Found volume group "fileserver" using metadata type lvm2
For training purposes let's rename our volumegroup fileserver intodata:
vgrename fileserver data
server1:~# vgrename fileserver data
Volume group "fileserver" successfully renamed to "data"
Let's run vgdisplay and vgscan again to see if the volume group has been renamed:
vgdisplay
server1:~# vgdisplay
--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 4
Act PV 4
VG Size 93.14 GB
PE Size 4.00 MB
Total PE 23844
Alloc PE / Size 0 / 0
Free PE / Size 23844 / 93.14 GB
VG UUID 3Y1WVF-BLET-QkKs-Qnrs-SZxI-wrNO-dTqhFP
vgscan
server1:~# vgscan
Reading all physical volumes. This may take a while...
Found volume group "data" using metadata type lvm2
Now let's delete our volume group data:
vgremove data
server1:~# vgremove data
Volume group "data" successfully removed
vgdisplay
No output this time:
server1:~# vgdisplay
vgscan
server1:~# vgscan
Reading all physical volumes. This may take a while...
Let's create our volume group fileserver again:
vgcreate fileserver /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
server1:~# vgcreate fileserver /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
Volume group "fileserver" successfully created
Next we create our logical volumes share (40GB), backup (5GB), and media (1GB) in the volume groupfileserver. Together they use a little less than 50% of the available space (that way we can make use of RAID1 later on):
lvcreate --name share --size 40G fileserver
server1:~# lvcreate --name share --size 40G fileserver
Logical volume "share" created
lvcreate --name backup --size 5G fileserver
server1:~# lvcreate --name backup --size 5G fileserver
Logical volume "backup" created
lvcreate --name media --size 1G fileserver
server1:~# lvcreate --name media --size 1G fileserver
Logical volume "media" created
Let's get an overview of our logical volumes:
lvdisplay
server1:~# lvdisplay
--- Logical volume ---
LV Name /dev/fileserver/share
VG Name fileserver
LV UUID 280Mup-H9aa-sn0S-AXH3-04cP-V6p9-lfoGgJ
LV Write Access read/write
LV Status available
# open 0
LV Size 40.00 GB
Current LE 10240
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:0
--- Logical volume ---
LV Name /dev/fileserver/backup
VG Name fileserver
LV UUID zZeuKg-Dazh-aZMC-Aa99-KUSt-J6ET-KRe0cD
LV Write Access read/write
LV Status available
# open 0
LV Size 5.00 GB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/fileserver/media
VG Name fileserver
LV UUID usfvrv-BC92-3pFH-2NW0-2N3e-6ERQ-4Sj7YS
LV Write Access read/write
LV Status available
# open 0
LV Size 1.00 GB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2
lvscan
server1:~# lvscan
ACTIVE '/dev/fileserver/share' [40.00 GB] inherit
ACTIVE '/dev/fileserver/backup' [5.00 GB] inherit
ACTIVE '/dev/fileserver/media' [1.00 GB] inherit
For training purposes we rename our logical volume media intofilms:
lvrename fileserver media films
server1:~# lvrename fileserver media films
Renamed "media" to "films" in volume group "fileserver"
lvdisplay
server1:~# lvdisplay
--- Logical volume ---
LV Name /dev/fileserver/share
VG Name fileserver
LV UUID 280Mup-H9aa-sn0S-AXH3-04cP-V6p9-lfoGgJ
LV Write Access read/write
LV Status available
# open 0
LV Size 40.00 GB
Current LE 10240
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:0
--- Logical volume ---
LV Name /dev/fileserver/backup
VG Name fileserver
LV UUID zZeuKg-Dazh-aZMC-Aa99-KUSt-J6ET-KRe0cD
LV Write Access read/write
LV Status available
# open 0
LV Size 5.00 GB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/fileserver/films
VG Name fileserver
LV UUID usfvrv-BC92-3pFH-2NW0-2N3e-6ERQ-4Sj7YS
LV Write Access read/write
LV Status available
# open 0
LV Size 1.00 GB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2
lvscan
server1:~# lvscan
ACTIVE '/dev/fileserver/share' [40.00 GB] inherit
ACTIVE '/dev/fileserver/backup' [5.00 GB] inherit
ACTIVE '/dev/fileserver/films' [1.00 GB] inherit
Next let's delete the logical volume films:
lvremove /dev/fileserver/films
server1:~# lvremove /dev/fileserver/films
Do you really want to remove active logical volume "films"? [y/n]: <-- y
Logical volume "films" successfully removed
We create the logical volume media again:
lvcreate --name media --size 1G fileserver
server1:~# lvcreate --name media --size 1G fileserver
Logical volume "media" created
Now let's enlarge media from 1GB to 1.5GB:
lvextend -L1.5G /dev/fileserver/media
server1:~# lvextend -L1.5G /dev/fileserver/media
Extending logical volume media to 1.50 GB
Logical volume media successfully resized
Let's shrink it to 1GB again:
lvreduce -L1G /dev/fileserver/media
server1:~# lvreduce -L1G /dev/fileserver/media
WARNING: Reducing active logical volume to 1.00 GB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce media? [y/n]: <-- y
Reducing logical volume media to 1.00 GB
Logical volume media successfully resized
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