File System using LVM in Linux
If you want to create a file system in linux using Logical volume manager.Then this post will help you.
First of all, create a .vhd (virtual hard disk) using your storage system, size as you required like 5 GB.
Then follow below steps to create a file system :-
1.Then login your server and find newly created disk by using below command :-
[root@rhelnode1 /]# fdisk -l
If you can not find recently created 5GB disk. Then follow below easy steps to scan your storage path like HBA or SCSI :-
A. Find you scsi hosts
[root@rhelnode1 /]# ls /sys/class/scsi_host
host0 host1 host2
B.Scan each host ports :-
[root@rhelnode1 /]# echo "- - -"> /sys/class/scsi_host/host0/scan
[root@rhelnode1 /]# echo "- - -"> /sys/class/scsi_host/host1/scan
[root@rhelnode1 /]# echo "- - -"> /sys/class/scsi_host/host2/scan
C.now run you can run again fdisk command :-
[root@rhelnode1 /]# fdisk -l 2> /dev/null | egrep '^Disk'| grep -v mapper| grep -v identifier
Disk /dev/sda: 48.3 GB, 48318382080 bytes, 94371840 sectors
Disk label type: dos
Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 sectors
Disk /dev/sdc: 5368 MB, 5368709120 bytes, 10485760 sectors
D. To see block device mapping:-
[root@rhelnode1 /]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 127G 0 disk
├─sda1 8:1 0 700M 0 part /boot
├─sda2 8:2 0 4.9G 0 part
│ └─vg01-swap 253:1 0 4.9G 0 lvm [SWAP]
└─sda3 8:3 0 49.3G 0 part
├─rhel-root 253:0 0 13.7G 0 lvm /
├─rhel-home 253:2 0 11.7G 0 lvm /home
├─rhel-var 253:3 0 12G 0 lvm /var
└─rhel-backup 253:4 0 11.8G 0 lvm /backup
sr0 11:0 1 1024M 0 rom
[root@amiteshjsk /]#
2.Now create a physical volume
[root@rhelnode1 /]# pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created.
3.Now create volume group and display you vg details
[root@rhelnode1 /]# vgcreate vg02 /dev/sdc
Volume group "vg02" successfully created
[root@rhelnode1 /]# vgdisplay vg02
--- Volume group ---
VG Name vg02
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 5.00 GiB
PE Size 4.00 MiB
Total PE 1279
Alloc PE / Size 0 / 0
Free PE / Size 1279 / 5.00 GiB
VG UUID vovDvR-WQUV-M0sE-OAZG-emAd-Vw77-Nzdkdv
[root@rhelnode1 /]#
4. Now you can create desired size(Max 5GB) logical volumes.
So here I want create two logical volumes (2GB +2.5GB)
[root@rhelnode1 /]# lvcreate -L 2G -n sync vg02
Logical volume "sync" created.
[root@rhelnode1 /]# lvcreate -L 2.5G -n backup vg02
Logical volume "backup" created.
[root@rhelnode1 /]#
5. Now format disk using xfs filesystem
[root@rhelnode1 /]# mkfs.xfs /dev/vg02/sync
meta-data=/dev/vg02/sync isize=512 agcount=4, agsize=131072 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=524288, 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
[root@rhelnode1 /]# mkfs.xfs /dev/vg02/backup
meta-data=/dev/vg02/backup isize=512 agcount=4, agsize=163840 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=655360, 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
[root@rhelnode1 /]#
6. Now you can mount your logical volumes after creating directories
[root@rhelnode1 /]# mkdir backup sync
[root@rhelnode1 /]# mount /dev/vg02/sync /sync
[root@rhelnode1 /]# mount /dev/vg02/backup /backup
[root@rhelnode1 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 21G 3.2G 18G 16% /
devtmpfs 1.2G 0 1.2G 0% /dev
tmpfs 1.3G 144K 1.3G 1% /dev/shm
tmpfs 1.3G 9.0M 1.2G 1% /run
tmpfs 1.3G 0 1.3G 0% /sys/fs/cgroup
/dev/mapper/rhel-var 7.9G 1.3G 6.6G 16% /var
tmpfs 247M 8.0K 247M 1% /run/user/0
/dev/mapper/vg01-data 2.0G 33M 2.0G 2% /data
/dev/mapper/vg02-sync 2.0G 33M 2.0G 2% /sync
/dev/mapper/vg02-backup 2.5G 33M 2.5G 2% /backup
[root@rhelnode1 /]#
7. Now make entries in /etc/fstab file for auto mount after reboot-
[root@rhelnode1 /]# vi /etc/fstab
/dev/mapper/vg01-data /data xfs defaults 0 2
/dev/mapper/vg02-sync /sync xfs defaults 0 2
/dev/mapper/vg02-backup /backup xfs defaults 0 2
/etc/fstab contains 6 parameters per row. Each row represents one file system details. They are as below:
1. Volume /dev/mapper/vg02-data
2. Mount point /data
3. File system type xfs
4. Options defaults
5. Dump 1,0 (for backup dump in failure)
6. Pass 0,1,2 (for fsck sequence top or bottom)
