LVM stands for Logical Volume Management. It is a system of managing logical volumes, or filesystems, that is much more advanced and flexible than the traditional method of partitioning a disk into one or more segments and formatting that partition with a filesystem.
LVM Implementation
[root@highperfrawdb scripts]# ls -la /dev/xvd*
brw-rw---- 1 root disk 202, 16 Jun 8 10:16 /dev/xvdb
brw-rw---- 1 root disk 202, 17 Jun 8 10:16 /dev/xvdb1
brw-rw---- 1 root disk 202, 18 Jun 8 10:16 /dev/xvdb2
brw-rw---- 1 root disk 202, 19 Jun 8 10:16 /dev/xvdb3
brw-rw---- 1 root disk 202, 32 Jun 8 15:39 /dev/xvdc
brw-rw---- 1 root disk 202, 48 Jun 8 15:39 /dev/xvdd
brw-rw---- 1 root disk 202, 64 Jun 8 15:39 /dev/xvde
brw-rw---- 1 root disk 202, 80 Jun 8 15:39 /dev/xvdf
[root@highperfrawdb scripts]# vgcreate /dev/vgstripe /dev/xvdc /dev/xvdd /dev/xvde /dev/xvdf
Physical volume "/dev/xvdc" successfully created
Physical volume "/dev/xvdd" successfully created
Physical volume "/dev/xvde" successfully created
Physical volume "/dev/xvdf" successfully created
Volume group "vgstripe" successfully created
[root@highperfrawdb scripts]# lvcreate -i4 -L395G -n lvstrip vgstripe
Using default stripesize 64.00 KiB
Logical volume "lvstrip" created
[root@highperfrawdb scripts]# lvdisplay
--- Logical volume ---
LV Path /dev/vgstripe/lvstrip
LV Name lvstrip
VG Name vgstripe
LV UUID b8j9js-61Ib-0W8e-XUcK-z26d-eQG7-OGXjPO
LV Write Access read/write
LV Creation host, time highperfrawdb, 2016-06-08 15:43:49 -0400
LV Status available
# open 0
LV Size 395.00 GiB
Current LE 101120
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1024
Block device 252:0
[root@highperfrawdb scripts]# mkfs -t ext4 /dev/vgstripe/lvstrip
mke2fs 1.43-WIP (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=16 blocks, Stripe width=64 blocks
25886720 inodes, 103546880 blocks
5177344 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
3160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@highperfrawdb scripts]# mkdir /lvs
[root@highperfrawdb scripts]# mount /dev/vgstripe/lvstrip /lvs
[root@highperfrawdb scripts]# cd /lvs
[root@highperfrawdb lvs]# ls
lost+found
[root@highperfrawdb ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Wed Apr 15 18:13:53 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=ac69bdf3-37be-47f2-9d59-6d4c672f98cc / ext4 defaults 1 1
UUID=947fa69d-3925-4738-a6c0-27d00f5c4f96 /boot ext4 defaults 1 2
UUID=d24de279-f4f1-46ae-aa3b-5297bd258dcc swap swap 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/vgstripe/lvstripe /lvs ext4 defaults 0 0
[root@highperfrawdb ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/xvdb3 25G 20G 4.5G 82% /
/dev/xvdb1 477M 148M 300M 34% /boot
/dev/mapper/vgstripe-lvstrip
389G 71M 369G 1% /lvs
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