Tanto tiempo sin postear nada.. Aqui un pequeo ejemplo de como utilizar lvm, vamos a agregar un disco nuevo presentado en un servidor HP Proliant, en un grupo de volumenes.
Revisar que el disco este presente, por lo general no existe una tabla de particion:
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[root@koopa ~]# fdisk -l
Disk /dev/cciss/c0d1: 72.8 GB, 72833679360 bytes
255 heads, 32 sectors/track, 17433 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes
Device Boot Start End Blocks Id System
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Creamos una particion primaria utilizando el comando fdisk
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[root@koopa ~]# fdisk /dev/cciss/c0d1
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**Se seleccionan en este ejemplo las siguientes opciones para crear una particion primaria
- n - nueva particion
- p - primaria
- se seleccionan los valores por default para utilizar todo el espacio del disco duro
- p - para imprimir las particiones
- w - para escribir los cambios y salir
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Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-17433, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-17433, default 17433):
Using default value 17433
Command (m for help): fdisk -l
f: unknown command
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): p
Disk /dev/cciss/c0d1: 72.8 GB, 72833679360 bytes
255 heads, 32 sectors/track, 17433 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes
Device Boot Start End Blocks Id System
/dev/cciss/c0d1p1 1 17433 71126624 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
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Se crea el volumen fisico utilizando pvcreate
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[root@koopa ~]# pvcreate /dev/cciss/c0d1
Physical volume "/dev/cciss/c0d1" successfully created
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Se lista el volumen fisico con pvdisplay
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[root@koopa ~]# pvdisplay
"/dev/cciss/c0d1" is a new physical volume of "67.83 GB"
--- NEW Physical volume ---
PV Name /dev/cciss/c0d1
VG Name
PV Size 67.83 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 0XUc4w-5YAY-0QdP-4eKr-fUtX-LtCY-pqNYdy
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Se crea el grupo de volumenes utilizando vgcreate
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[root@koopa ~]# vgcreate VG_Share /dev/cciss/c0d1
Volume group "VG_Share" successfully created
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Se lista el grupo de volumenes creado con vgdisplay
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[root@koopa ~]# vgdisplay
--- Volume group ---
VG Name VG_Share
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 67.83 GB
PE Size 4.00 MB
Total PE 17364
Alloc PE / Size 0 / 0
Free PE / Size 17364 / 67.83 GB
VG UUID SacoKh-16Yb-i3lr-JxT0-7SAK-zRTs-WxR0TR
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Se crea un volumen logico con lvcreate
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Nota: para utilizar todo el espacio del disco se puede utilizar le valor de Free PE mostrado anteriormente, esto equivale a:
PE Size * Free PE = Espacio del disco
4 * 17364 = 67.83GB
[root@koopa ~]# lvcreate -l 17364 -n LV_Share VG_Share
Logical volume "LV_Share" created
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Se lista el volumen logico con lvdisplay
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[root@koopa ~]# lvdisplay
--- Logical volume ---
LV Name /dev/VG_Share/LV_Share
VG Name VG_Share
LV UUID NNzm0p-doEJ-CUix-dHWR-2Z0s-PI7z-gOO1sx
LV Write Access read/write
LV Status available
# open 0
LV Size 67.83 GB
Current LE 17364
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
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Se formatea el volument logico, en este caso a ext3 utilizando mke2fs
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[root@koopa ~]# mke2fs -j /dev/VG_Share/LV_Share
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
8896512 inodes, 17780736 blocks
889036 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
543 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
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Luego el disco ya esta listo para ser montado al sistema.
Se crea un punto de montaje
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[root@koopa ~]# mkdir /mnt/kshare
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Se monta el volumen logico
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[root@koopa ~]# mount /dev/VG_Share/LV_Share /mnt/kshare
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Si se quiere mantener este disco montado despues de cada reinicio, se agrega la siguiente linea a /etc/fstab
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/dev/VG_Share/LV_Share /mnt/kshare ext3 defaults 0 0
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Listo!!! Que disfruten!
WilC
