Embedded Files
Linux Logical Volume Manager
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsdd 8:48 0 20G 0 disk /mnt/AHFsdb 8:16 0 50G 0 disk /mnt/u01sdc 8:32 0 50G 0 disk /mnt/u02sda 8:0 0 50G 0 disk ├─sda2 8:2 0 19G 0 part │ ├─ol-swap 252:1 0 2G 0 lvm [SWAP]│ └─ol-root 252:0 0 17G 0 lvm /└─sda1 8:1 0 1G 0 part /bootIn the TYPE column of lsblk...
disk = Disks (sda)
part = Partition (sda2)
lvm = Logical Volume (ol-root)
Identify device...
lsblk
Our device is shown as...sdb 8:16 0 50G 0 disk .. therefore the device will be /dev/sdbCreate the Physical Volume...
pvcreate /dev/sdb
Create Volume Group...
(called myvg using just the /dev/sdb device.. note, you can span multiple devices)vgcreate myvg /dev/sdb
Create Logical Volume...
(called mylv, size 49GB in the myvg Volume Group)lvcreate -n mylv -L 49G myvg
If you try to create a 50GB Logical Volume, you will get this error...Volume group "myvg" has insufficient free space (12799 extents): 12800 required.Create Filesystem...
(in this case an ext4 filesystem. Use the LV Path from the lvdisplay command. The filesystem will be the same size as the underlying Logical Volume)mkfs.ext4 /dev/myvg/mylv
Create a mount point...
mkdir /mysql
Mount the filesystem...
mount /dev/myvg/mylv /mysql
Give the device a Label...
e2label /dev/myvg/mylv mysql
For other filesystem types use appropriate alternative commands like xfs_admin or fatlabelAdd a line to /etc/fstab if you want it to mount automatically at boot time...
LABEL=mysql /mysql ext4 defaults 0 2
You can use a device node (/dev/myvg/mylv) but using a Label is now the recommended method.Alternatively...
fdisk -l
Check with...
pvs
pvdisplay
vgs
vgdisplay myvg
lvs
lvdisplay myvg
(note we're passing the VG not the LV)lvdisplay /dev/myvg/mylv
mount | grep "^/dev" | column -t
df -h
Resize a Logical Volume
Resize a Logical Volume
First make sure there is room...
vgs
VG #PV #LV #SN Attr VSize VFree mysqlvg 1 2 0 wz--n- <100.00g 1020.00m rootvg 1 10 0 wz--n- <48.51g 20.08g
lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert backuplv mysqlvg -wi-ao---- 49.00g mysqllv mysqlvg -wi-ao---- 50.00g home rootvg -wi-ao---- 1.00g opt rootvg -wi-ao---- <3.04g opt_rapid7 rootvg -wi-ao---- 2.00g opt_sentinelone rootvg -wi-ao---- 2.00g root rootvg -wi-ao---- 2.00g swap rootvg -wi-ao---- 2.00g tmp rootvg -wi-ao---- 1.00g usr rootvg -wi-ao---- 5.39g var rootvg -wi-ao---- 5.00g var_log rootvg -wi-ao---- 5.00g
Let's extend the usr logical volume by 2G
(we can see it's in the rootvg and there is >20G free space that we can use for this)lvextend -L +2G /dev/rootvg/usr
Size of logical volume rootvg/usr changed from 5.39 GiB (1380 extents) to 7.39 GiB (1892 extents). 7f3dc219c000-7f3dc219d000 r--p 0001d000 fc:02 4217670 /usr/lib64/libgcc_s-11-20240719.so.1: mlock failed: Cannot allocate memory 7f3dc2483000-7f3dc2484000 r--p 0005f000 fc:02 4194844 /usr/lib64/libdevmapper.so.1.02: mlock failed: Cannot allocate memory 7f3dc24ea000-7f3dc24eb000 r--p 00005000 fc:02 4196334 /usr/lib64/libaio.so.1.0.1: mlock failed: Cannot allocate memory 7f3dc2683000-7f3dc2684000 r--p 00008000 fc:02 4199761 /usr/lib64/libdevmapper-event.so.1.02: mlock failed: Cannot allocate memory 7f3ec1ea0000-7f3ec1ea1000 r--p 00005000 fc:02 4199488 /usr/lib64/libksplice_helper.so: mlock failed: Cannot allocate memory Logical volume rootvg/usr successfully resized.
The memory allocation errors are not significant for our action. We can see that the logical volume has been successfully resized.
TODO... what are these memory allocation errors about?
What we do next depends on the type of filesystem we are using. See the "Type" column in the output from this comamnd...
df -Th /usr
Filesystem Type Size Used Avail Use% Mounted on/dev/mapper/rootvg-usr xfs 5.4G 4.6G 810M 86% /usr
xfs
xfs
xfs_growfs /usr
meta-data=/dev/mapper/rootvg-usr isize=512 agcount=5, agsize=327680 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=0 = reflink=1 bigtime=1 inobtcount=1 nrext64=0 = exchange=0data = bsize=4096 blocks=1413120, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0, ftype=1, parent=0log =internal log bsize=4096 blocks=16384, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 1413120 to 1937408
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