Creating Logical Volumes using MB Size’s

[root@LVM ~]# mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext=”system_u:object_r:tmpfs_t:s0″)
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
vmware-vmblock on /var/run/vmblock-fuse type fuse.vmware-vmblock (rw,nosuid,nodev,default_permissions,allow_other)

[root@LVM ~]# ls -l /lvmdata/
total 0

[root@LVM ~]# mount /dev/volumegroup-name/logicalvolume-name /lvmdata/

[root@LVM ~]# ls -l /lvmdata/
total 12
drwx——. 2 root root 12288 Feb 21 18:17 lost+found

[root@LVM ~]# mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext=”system_u:object_r:tmpfs_t:s0″)
/dev/sda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
vmware-vmblock on /var/run/vmblock-fuse type fuse.vmware-vmblock (rw,nosuid,nodev,default_permissions,allow_other)
/dev/mapper/volumegroup–name-logicalvolume–name on /lvmdata type ext4 (rw)

[root@LVM ~]# df -hT
Filesystem           Type   Size  Used Avail Use% Mounted on
/dev/sda3            ext4    55G  5.5G   47G  11% /
tmpfs                tmpfs  358M   72K  358M   1% /dev/shm
/dev/sda1            ext4   283M   41M  228M  16% /boot
/dev/mapper/volumegroup–name-logicalvolume–name
                     ext4   190M  1.6M  179M   1% /lvmdata
————————————————————————————————————-


[root@LVM ~]# vim /etc/fstab 
#
# /etc/fstab
# Created by anaconda on Thu Dec 24 00:47:10 2015
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk’
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=cbc3eda3-9a23-4943-a8c4-3990addeb161 /                       ext4    defaults        1 1
UUID=d5b88247-f67f-4b40-9862-16826e250b78 /boot                   ext4    defaults        1 2
UUID=af69d0e5-b600-49a0-9228-d4195936bdd2 swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0

/dev/mapper/volumegroup–name-logicalvolume–name  /lvmdata  ext4 defaults 0 0
———————————————————————————————————–
[root@LVM ~]# reboot

[root@LVM ~]# mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext=”system_u:object_r:tmpfs_t:s0″)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/volumegroup–name-logicalvolume–name on /lvmdata type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
vmware-vmblock on /var/run/vmblock-fuse type fuse.vmware-vmblock (rw,nosuid,nodev,default_permissions,allow_other)
——————————————————————————————
[root@LVM ~]# lvdisplay 
— Logical volume —
LV Path                /dev/volumegroup-name/logicalvolume-name
LV Name                logicalvolume-name
VG Name                volumegroup-name
LV UUID                H2CqM4-9mLm-i5d5-20Im-ZZj5-fWR0-ZMJHVQ
LV Write Access        read/write
LV Creation host, time LVM, 2016-02-21 18:15:16 -0800
LV Status              available
# open                 1
LV Size                200.00 MiB
Current LE             50
Segments               2
Allocation             inherit
Read ahead sectors     auto
– currently set to     256
Block device           253:0

[root@LVM ~]# lvextend –size 300M /dev/volumegroup-name/logicalvolume-name
Size of logical volume volumegroup-name/logicalvolume-name changed from 200.00 MiB (50 extents) to 300.00 MiB (75 extents).
Logical volume logicalvolume-name successfully resized

[root@LVM ~]# lvdisplay 
— Logical volume —
LV Path                /dev/volumegroup-name/logicalvolume-name
LV Name                logicalvolume-name
VG Name                volumegroup-name
LV UUID                H2CqM4-9mLm-i5d5-20Im-ZZj5-fWR0-ZMJHVQ
LV Write Access        read/write
LV Creation host, time LVM, 2016-02-21 18:15:16 -0800
LV Status              available
# open                 1
LV Size                300.00 MiB
Current LE             75
Segments               3
Allocation             inherit
Read ahead sectors     auto
– currently set to     256
Block device           253:0

[root@LVM ~]# umount /lvmdata/

[root@LVM ~]# lvremove /dev/mapper/volumegroup–name-logicalvolume–name
Do you really want to remove active logical volume logicalvolume-name? [y/n]: y
Logical volume “logicalvolume-name” successfully removed

[root@LVM ~]# lvdisplay
[root@LVM ~]#
—————————————————————————————————
[root@LVM ~]# vgdisplay
— Volume group —
VG Name               volumegroup-name
System ID
Format                lvm2
  Metadata Areas        3
Metadata Sequence No  6
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               320.00 MiB
PE Size               4.00 MiB
Total PE              80
Alloc PE / Size       0 / 0
Free  PE / Size       80 / 320.00 MiB
VG UUID               Chs0rl-ZfV0-D2WQ-4D2X-Jnt0-UUaJ-2vjBpD
———————————

[root@LVM ~]# vgreduce volumegroup-name /dev/sda7
Removed “/dev/sda7” from volume group “volumegroup-name”

[root@LVM ~]# vgdisplay
— Volume group —
VG Name               volumegroup-name
System ID
Format                lvm2
  Metadata Areas        2
Metadata Sequence No  7
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                0
Open LV               0
Max PV                0
Cur PV                2
Act PV                2
  VG Size               212.00 MiB
PE Size               4.00 MiB
Total PE              53
Alloc PE / Size       0 / 0
Free  PE / Size       53 / 212.00 MiB
VG UUID               Chs0rl-ZfV0-D2WQ-4D2X-Jnt0-UUaJ-2vjBpD

Creating Logical Volumes using PE Size’s