Create LVM in Linux

Querry size of the disk

root@lnx03 ~]# df -H
Filesystem                        Size  Used Avail Use% Mounted on
devtmpfs                          4.0M     0  4.0M   0% /dev
tmpfs                             876M     0  876M   0% /dev/shm
tmpfs                             351M  8.1M  343M   3% /run
/dev/mapper/rhel_unknown-root      12G  2.7G  9.3G  23% /
/dev/nvme0n1p2                   1014M  243M  772M  24% /boot
/dev/nvme0n1p1                    599M  7.0M  592M   2% /boot/efi
tmpfs                             176M  4.0K  176M   1% /run/user/0
/dev/mapper/project01-dockerdemo   10G  104M  9.9G   2% /demo-fs01

Check for all the physical volumes in use

pvscan

List all Hard drives on a System

lsblk

Create Physical Volume (PV) from spare disks

root@lnx03 ~]# pvcreate /dev/sda /dev/sdb /dev/sdc
  Physical volume "/dev/sda" successfully created.
  Physical volume "/dev/sdb" successfully created.
  Physical volume "/dev/sdc" successfully created.
[root@lnx03 ~]#

Display the PVs you have created

[root@lnx03 ~]# pvs
  Devices file sys_wwid eui.0a9147b659350724000c296de3efb17c PVID yHDg1nLoW8Jg3iwNtMHkj3WatmRFlfwb last seen on /dev/nvme0n1p3 not found.
  PV         VG        Fmt  Attr PSize  PFree  
  /dev/sda   project01 lvm2 a--  <5.30g      0 
  /dev/sdb   project01 lvm2 a--  <5.10g 404.00m
  /dev/sdc   project01 lvm2 a--  <5.20g  <5.20g
[root@lnx03 ~]#

Creating a volume group with three PV’s

vgcreate project_ansible_vg /dev/sde /dev/sdf /dev/sdg

Display the status of the volume group

[root@lnx03 ~]# vgs
  Devices file sys_wwid eui.0a9147b659350724000c296de3efb17c PVID yHDg1nLoW8Jg3iwNtMHkj3WatmRFlfwb last seen on /dev/nvme0n1p3 not found.
  VG        #PV #LV #SN Attr   VSize   VFree 
  project01   3   1   0 wz--n- <15.59g <5.59

root@lnx03 ~]# vgdisplay -v  project01
  Devices file sys_wwid eui.0a9147b659350724000c296de3efb17c PVID yHDg1nLoW8Jg3iwNtMHkj3WatmRFlfwb last seen on /dev/nvme0n1p3 not found.
  --- Volume group ---
  VG Name               project01
  System ID             
  Format                lvm2
  Metadata Areas        3
  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                3
  Act PV                3
  VG Size               <15.59 GiB
  PE Size               4.00 MiB
  Total PE              3991
  Alloc PE / Size       0 / 0   
  Free  PE / Size       3991 / <15.59 GiB
  VG UUID               EWRGZq-tLd4-7xwJ-3ykG-9NMF-8rfc-YjQhQ9
   
  --- Physical volumes ---
  PV Name               /dev/sda     
  PV UUID               22yl88-9DaG-eAaK-2OIO-3i1o-NOuP-YZmyQF
  PV Status             allocatable
  Total PE / Free PE    1356 / 1356
   
  PV Name               /dev/sdb     
  PV UUID               2CRcdu-q9GK-73Cb-D1rD-ix9l-BZRu-02OqtP
  PV Status             allocatable
  Total PE / Free PE    1305 / 1305
   
  PV Name               /dev/sdc     
  PV UUID               i6ie94-1eg7-ygm9-kbdq-qPST-bPlg-zqjQ5t
  PV Status             allocatable
  Total PE / Free PE    1330 / 1330

Creating logical volumes


[root@lnx03 ~]# lvcreate -L +10g -n dockerdemo project01 
  Logical volume "dockerdemo" created.

Display the status of the logical volume

[root@lnx03 ~]# lvs
  Devices file sys_wwid eui.0a9147b659350724000c296de3efb17c PVID yHDg1nLoW8Jg3iwNtMHkj3WatmRFlfwb last seen on /dev/nvme0n1p3 not found.
  LV         VG        Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  dockerdemo project01 -wi-a----- 10.00g

root@lnx03 ~]# lvdisplay -v /dev/project01/dockerdemo 
  Devices file sys_wwid eui.0a9147b659350724000c296de3efb17c PVID yHDg1nLoW8Jg3iwNtMHkj3WatmRFlfwb last seen on /dev/nvme0n1p3 not found.
  --- Logical volume ---
  LV Path                /dev/project01/dockerdemo
  LV Name                dockerdemo
  VG Name                project01
  LV UUID                3W2aec-Q943-ckLt-yI5v-5xtu-BFIn-Q0X0Mf
  LV Write Access        read/write
  LV Creation host, time lnx03, 2023-10-26 09:52:59 +0100
  LV Status              available
  # open                 0
  LV Size                10.00 GiB
  Current LE             2560
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2

Creating an ext4 filesystem

mkfs -t ext4 /dev/project01/dockerdemo

Creating an XFS filesystem

[root@lnx03 ~]# 
[root@lnx03 ~]# mkfs.xfs /dev/project01/dockerdemo 
meta-data=/dev/project01/dockerdemo isize=512    agcount=4, agsize=655360 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1    bigtime=1 inobtcount=1
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

Mount the filesystem

root@lnx03 ~]# mkdir /demo-fs01
root@lnx03 ~]# mount /dev/project01/dockerdemo /demo-fs01/

Add an entry to fstab

[root@lnx03 ~]# tail -2 /etc/fstab 
/dev/project01/dockerdemo	/demo-fs01	xfs     defaults        0 0

Checking if the filesystem is mounted

[root@lnx03 ~]# mount -av
/                        : ignored
/boot                    : already mounted
/boot/efi                : already mounted
none                     : ignored
/demo-fs01               : already mounted
[root@lnx03 ~]#