lvm walkthrough¶
Most of this is taken from the linux handbook
the setup¶
host |
distribution |
version |
disk |
size |
|---|---|---|---|---|
geidi |
rocky linux |
9.4 |
disk |
931.5G |
Physical Volume¶
[ddp@geidi ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 55.9G 0 disk
sda1 8:1 0 1G 0 part /boot
sda2 8:2 0 54.9G 0 part
rl-root 253:0 0 33.1G 0 lvm /
rl-swap 253:1 0 5.6G 0 lvm [SWAP]
rl-home 253:2 0 16.2G 0 lvm /home
sdb 8:16 0 465.8G 0 disk
sdb1 8:17 0 465.8G 0 part
nvme0n1 259:0 0 931.5G 0 disk
fdisk
^^^^^
.. code-block:: bash
[root@geidi ddp]# fdisk /dev/nvme0n1
Welcome to fdisk (util-linux 2.37.4).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x74c9c12b.
Command (m for help): p
Disk /dev/nvme0n1: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: CT1000P3SSD8
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x74c9c12b
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-1953525167, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-1953525167, default 1953525167): +900G
Created a new partition 1 of type 'Linux' and of size 900 GiB.
Command (m for help): p
Disk /dev/nvme0n1: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: CT1000P3SSD8
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x74c9c12b
Device Boot Start End Sectors Size Id Type
/dev/nvme0n1p1 2048 1887438847 1887436800 900G 83 Linux
Command (m for help): t
Selected partition 1
Hex code or alias (type L to list all): 8E
Changed type of partition 'Linux' to 'Linux LVM'.
Command (m for help): p
Disk /dev/nvme0n1: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: CT1000P3SSD8
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x74c9c12b
Device Boot Start End Sectors Size Id Type
/dev/nvme0n1p1 2048 1887438847 1887436800 900G 8e Linux LVM
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
This adds `nvme0n1p1 259:1 0 900G 0 part` to the `lsblk` output.
pvcreate
^^^^^^^^
Create a Physical Volume.
.. code-block:: console
[root@geidi ddp]# pvcreate /dev/nvme0n1p1
[root@geidi ddp]# pvdisplay
PV Name /dev/sda2
VG Name rl
PV Size <54.90 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 14053
Free PE 0
Allocated PE 14053
PV UUID ij2tAT-FqGx-jF3U-ulh5-tmnL-VL4v-0RPZSR
"/dev/nvme0n1p1" is a new physical volume of "900.00 GiB"
--- NEW Physical volume ---
PV Name /dev/nvme0n1p1
VG Name
PV Size 900.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID ralfG7-8lMd-noQY-MDZM-ORD3-uWcP-oJBWN7
[root@geidi ddp]# pvscan
PV /dev/nvme0n1p1 lvm2 [900.00 GiB]
Total: 2 [954.89 GiB] / in use: 1 [54.89 GiB] / in no VG: 1 [900.00 GiB]
[root@geidi ddp]# pvs
/dev/nvme0n1p1 lvm2 --- 900.00g 900.00g
/dev/sda2 rl lvm2 a-- 54.89g 0
Volume Groups¶
Use vgcreate to create a Virtual Group
[root@geidi ddp]# vgcreate iscsi_stuff /dev/nvme0n1p1 [root@geidi ddp]# vgs iscsi_stuff 1 0 0 wz--n- <900.00g <900.00g rl 1 3 0 wz--n- 54.89g 0 [root@geidi ddp]# pvs /dev/nvme0n1p1 iscsi_stuff lvm2 a-- <900.00g <900.00g /dev/sda2 rl lvm2 a-- 54.89g 0 [root@geidi ddp]# vgdisplay VG Name rl System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 54.89 GiB PE Size 4.00 MiB Total PE 14053 Alloc PE / Size 14053 / 54.89 GiB Free PE / Size 0 / 0 VG UUID 5C2Xt5-PtII-zwTG-oOpr-5oWv-YefG-R4Qwb8 --- Volume group --- VG Name iscsi_stuff System ID Format lvm2 Metadata Areas 1 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 1 Act PV 1 VG Size <900.00 GiB PE Size 4.00 MiB Total PE 230399 Alloc PE / Size 0 / 0 Free PE / Size 230399 / <900.00 GiB VG UUID zkknRU-lyNr-Nv3W-nWEn-fRjm-yBow-bVF88g [root@geidi ddp]# pvdisplay -S vgname=iscsi_stuff -C -p pv_name Error during parsing of command line. [root@geidi ddp]# pvdisplay -S vgname=iscsi_stuff -C -o pv_name /dev/nvme0n1p1
Logical Volumes¶
Logical Volumes
[root@geidi ddp]# lvcreate -L 10G -n test_lv iscsi_stuff [root@geidi ddp]# lvs test_lv iscsi_stuff -wi-a----- 10.00g home rl -wi-ao---- 16.17g root rl -wi-ao---- <33.13g swap rl -wi-ao---- 5.59g [root@geidi ddp]# lvdisplay LV Path /dev/rl/swap LV Name swap VG Name rl LV UUID 0BTcSh-13vI-y0Xh-xfpy-mStv-d5St-MpaYb5 LV Write Access read/write LV Creation host, time localhost.localdomain, 2025-02-05 18:49:01 -0500 LV Status available # open 2 LV Size 5.59 GiB Current LE 1432 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Path /dev/rl/home LV Name home VG Name rl LV UUID 9I2jGK-CweU-AS6u-1ADT-cRCy-qaWc-8Wb5D4 LV Write Access read/write LV Creation host, time localhost.localdomain, 2025-02-05 18:49:01 -0500 LV Status available # open 1 LV Size 16.17 GiB Current LE 4140 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Logical volume --- LV Path /dev/rl/root LV Name root VG Name rl LV UUID sbhI2C-bABg-7LBS-0wGi-e94H-XGQQ-t8XHzH LV Write Access read/write LV Creation host, time localhost.localdomain, 2025-02-05 18:49:01 -0500 LV Status available # open 1 LV Size <33.13 GiB Current LE 8481 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/iscsi_stuff/test_lv LV Name test_lv VG Name iscsi_stuff LV UUID dcEF7Q-7r1D-X4gy-wJMb-8Qze-DHHO-ijBqAq LV Write Access read/write LV Creation host, time geidi, 2025-03-26 16:02:41 -0400 LV Status available # open 0 LV Size 10.00 GiB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 [root@geidi ddp]# lvcreate -L 100G -n elasticsearch0 iscsi_stuff [root@geidi ddp]# lvcreate -L 100G -n elasticsearch1 iscsi_stuff [root@geidi ddp]# lvcreate -L 100G -n elasticsearch2 iscsi_stuff [root@geidi ddp]# mkfs.ext4 /dev/iscsi_stuff/ elasticsearch0 elasticsearch1 elasticsearch2 test_lv [root@geidi ddp]# mkfs.ext4 /dev/iscsi_stuff/test_lv Discarding device blocks: done Creating filesystem with 2621440 4k blocks and 655360 inodes Filesystem UUID: db2bdc13-c636-42b7-8bd8-792b60e309a5 Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632 Allocating group tables: done Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done [root@geidi ddp]# mount -t ext4 /dev/iscsi_stuff/test_lv /mnt [root@geidi ddp]# df -h /mnt /dev/mapper/iscsi_stuff-test_lv 9.8G 24K 9.3G 1% /mnt [root@geidi ddp]# umount /mnt