- The document discusses the configuration and management of logical volume manager (LVM) and XFS filesystem on Redhat Enterprise Linux 6.x. - It describes the components of LVM including physical volumes, volume groups, and logical volumes. It then shows commands to create a volume group from two physical volumes, extend the logical volume size by adding a new physical disk, and grow the XFS filesystem. - The key steps shown are: creating physical volumes from disks, creating a volume group, making a logical volume, formatting it as XFS, mounting it, adding a new disk as physical volume to the volume group, extending the logical volume size, and growing the XFS filesystem.

1. Logical Volume Manager | XFS
Redhat Enterprise Linux 6.x
Presented by Sarwar Javaid

3. LVM Structure
LVM consists of the following components:
Physical Volumes: these are the “real” disk devices.
Volume Group: a physical volume group (or just volume group for short) is a group of physical disks
Logical Volume: the logical volume is the top of the LVM pyramid.
LVM Configuration
[root@lvm-test ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 8.1G 8.3G 50% /
tempfs 940M 0 940M 0% /dev/shm
/dev/sda1 504M 44M 435M 10% /boot
/dev/sdb1 5G 2M 4.9G 1% /Data
Change Partition ID '8e'{ Linux LVM } on both Secoundry Hard Drives {'/dev/sdb'}
[root@lvm-test ~]# fdisk /dev/sdb
Command (m for help): p
Device Boot Start End Blocks Id System
/dev/sdb1 1 1448 5241740 83 Linux

4. Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
/dev/sdb1 1 1448 5241740 8e Linux LVM
Physical Volume::Create
Syntax: pvcreate <physicaldeviceName>
[root@lvm-test ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
Report information about physical volumes
Physical Volume::Report Information
[root@lvm-test ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb1 lvm2 a-- 5.00g 5.00g

5. Physical Volume::Display information Attribute
[root@lvm-test ~]# pvdisplay
"/dev/sdb1" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 5.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID bvqsXU-NHcR-ARpa-U5RB-NM7b-4Pb5-1bX3ZS
Physical Volume::Group Creation
Syntax
vgcreate -s <blockSize> VOLUMEGROUPNAME PHYSICALVOLPATH [PHYSICALVOLPATH] …
[root@lvm-test ~]# vgcreate -s 4MB Primary_Group /dev/sdb1
Volume Group “Primary_Group” successfully created

6. Logical Volume::Creation
Syntax: lvcreate -l {extents “+LogicalExtentsNumber%SPACE”> -n VGNAME
[root@lvm-test ~]# lvcreate -l 100%FREE -n volgroup_01 Primary_Group
Logical volume "volgroup_01" created
Logical Volume::Display information Attribute
[root@lvm-test ~]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
volgroup_01 Primary_Group -wi-a---- 5.00g

7. Filesystem::Create [XFS]
Syntax: mkfs.xfs <device name>
[root@lvm-test ~]# mkfs.xfs /dev/primary_group/volgroup_01
meta-data=/dev/primary_group/volgroup_01 isize=256 agcount=4, agsize=654848 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=2619392, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
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
Filesystem::Mount point Creation
A) Label
Syntax: xfs_admin -L <Labe name> <device name>
[root@lvm-test ~]# mkdir /Data && xfs_admin -L “/Data” /dev/primary_group/volgroup_01
writing all SBs
new label = "/Data"

8. B) UUID “Universally Unique Identifier”
Syntax: blkid | grep <filesystem>
[root@lvm-test ~]# blkid | grep xfs
/dev/mapper/Primary Group-volgroup_01: UUID="06ad9ff2-4cca-4b14-a336-f6bffc351db0" TYPE="xfs"
C) Bootable
[root@lvm-test ~]# vi /etc/fstab → {add following line in file}
UUID=06ad9ff2-4cca-4b14-a336-f6bffc351db0 /Data xfs defaults 1 2
[x: save and quit]
D) Test
[root@lvm-test ~]# mount /Data
[root@lvm-test ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 8.2G 8.2G 50% /
tmpfs 940M 224K 940M 1% /dev/shm
/dev/sda1 504M 44M 435M 10% /boot
/dev/mapper/Primary_Group-volgroup_01
5.0G 33M 5.0G 1% /Data

9. Logical Volume::Extend Logical Volume Size [newDisk]
Power off the virtual machine. Edit the virtual machine settings and add new virtual disk [requiured size]. In this
scenario we choose 5GB

10. Partition::Create [Linux LVM]
Syntax: fdisk <device name>
[root@lvm-test ~]# fdisk /dev/sdc
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1018, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1018, default 1018):
Using default value 1018
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

11. Command (m for help): p
Disk /dev/sdc: 5368 MB, 5368709120 bytes
166 heads, 62 sectors/track, 1018 cylinders
Units = cylinders of 10292 * 512 = 5269504 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c1964
Device Boot Start End Blocks Id System
/dev/sdc1 1 1018 5238597 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
Physical Volume::Create
[root@lvm-test ~]# pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created
Physical Volume::Report information
[root@lvm-test ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb1 Primary_Group lvm2 a-- 5.00g 0
/dev/sdc1 lvm2 a-- 5.00g 5.00g

12. Physical Volume::Display information Attribute
[root@lvm-test ~]# pvdisplay
"/dev/sdb1" is a new physical volume of "5.00 GiB"
--- Physical volume ---
PV Name /dev/sdb1
VG Name Primary_Group
PV Size 5.00 GiB / not usable 2.89 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 1279
Free PE 0
Allocated PE 1279
PV UUID LmdgEl-a8Eh-9dt0-HqRw-v13R-gVAl-hgkwaX
"/dev/sdc1" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdc1
VG Name
PV Size 5.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID WiMTu0-Iuti-V1f0-e8KX-tri4-zLIX-gd4FWl

13. Volume Group ::Device add
Syntax: vgextend {VolumeGroup} <deviceName>
[root@lvm-test ~]# vgextend Primary_Group /dev/sdc1
Volume group "Primary_Group" successfully extended
Volume Volume::Size extend
Syntax: lvextend -l {extents “+LogicalExtentsNumber%SPACE”> <logicalVolumePath>
[root@lvm-test ~]# lvextend -l +100%FREE /dev/mapper/Primary_Group-volgroup_01
Extending logical volume volgroup_01 to 9.99 GiB
Logical volume volgroup_01 successfully resized

14. FileSystem::Grow
Syntax: xfs_growfs <logicalVolumePath>
[root@lvm-test ~]# xfs_growfs /dev/Primary_Group/volgroup_01
meta-data=/dev/mapper/Primary_Group-volgroup_01 isize=256 agcount=4, agsize=327424 blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=1309696, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 1309696 to 2618368
Final
[root@lvm-test ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 8.3G 8.1G 51% /
tempfs 940M 76K 940M 1% /dev/shm
/dev/sda1 504M 67M 412M 14% /boot
/dev/mapper/Primary_Group-volgroup_01
10G 34M 10G 1% /Data