LVM 설정예제 2

Demonstration

Start by looking at our existing disks
```
cat /proc/scsi/
dmesg |grep sd
```
Next, partition the new disks using fdisk
```
fdisk /dev/sdb
```
1. p to Print the existing table (should be blank)
2. n to create a new partition
3. t to change partition system ID to 8e (Linux LVM)
4. w to write new table to disk
Repeat for /dev/sdc
Create the physical volumes
```
pvcreate /dev/sdb1
pvcreate /dev/sdc1
```
NOTE: You can create multiple PVs on a single disk, but it is not recommended. Show existing Physical Volumes
```
pvscan
```
Show Volume Groups
```
vgscan (should return nothing)
```
Create a Volume Group from the Physical Volumes
```
vgcreate opt_vg /dev/sdb1 /dev/sdc1
```
NOTE: You can specify PE size in vgcreate. Default is 4M. You'd use larger PE sizes for LVs greater than 256G. 65K PEs per LV.
Show Volume Groups
```
vgscan (now shows the VG we created)
```
Display information about the VG
```
vgdisplay 
```

Create a Logical Volume within the VG

lvcreate -l num_of_extents -n opt_lv opt_vg
lvcreate -L 100M -n opt_lv opt_vg
lvcreate -L 100M -n opt_lv -i num_stripes opt_vg
lvcreate -L 100M -n opt_lv opt_vg [PhysicalVolumePath]

Display information about the LV

lvdisplay
lvdisplay -m (Show maps. Compare striped vs un-striped)

Create a mount point
```
mkdir /opt/foo1
mkdir /opt/striped
```

Create a filesystem

mkfs.ext3 /dev/opt_vg/opt_lv
mkfs.ext3 /dev/opt_vg/striped_lv

Mount the filesystems
```
mount /dev/opt_vg/opt_lv
df -h 
```

Growing a Filesystem

Grow an EXT2/3 filesystem (with unmount)

Unmount the FS
```
umount /mnt/lvm_filesystem
```

Extend the LV

lvresize -l +50 /dev/opt_vg/opt_lv
lvresize -L +200M /dev/opt_vg/opt_lv
fsck the filesystem 
e2fsck -f /dev/opt_vg/opt_lv

Resize the filesystem
```
resize2fs /dev/opt_vg/opt_lv
```

Remount the filesystem

mount -t ext3 /dev/opt_vg/opt_lv /mnt/lvm_filesystem

Grow an EXT2/3 filesystem (without unmount)

Extend the LV

lvresize -l +50 /dev/opt_vg/opt_lv
lvresize -L +200M /dev/opt_vg/opt_lv

Grow the filesystem

ext2online /mnt/lvm_filesystem (using mount path)
ext2online /dev/opt_vg/opt_lv (using device)

Grow a ReiserFS filesystem

Create a ReiserFS on /dev/opt_vg/striped_lv
```
mkreiserfs /dev/opt_vg/striped_lv
```

Mount the FS

df -h
lvresize -L +50M /dev/opt_vg/striped_lv
resize_reiserfs -f /dev/opt_vg/striped_lv
df -h

Add a Physical Volume to a VG
```
vgextend vgname /path/to/PV
```

adminschool.net wiki

목차

LVM 설정예제 2

Demonstration

Growing a Filesystem

Grow an EXT2/3 filesystem (with unmount)

Grow an EXT2/3 filesystem (without unmount)

Grow a ReiserFS filesystem