Extend a Volume Group

Gestire i Volume Groups & Logical Volumes

• Effettuare una scansione dei logical volumes e verificarne lo stato

lvscan -a

• Riattivare un LV che risulti disattivo

lvchange -ay <pathToLV>

• Disattivare un LV

lvchange -an <pathToLV>

Aggiungere un disco fisico ad un VolumeGroup

vgextend <volume-group-name> /dev/sdX

Nota: Se è necessario aggiungere alla vm un disco fisico seguire questa guida: Aggiungere_un_disco_virtuale

Creare un Logical Volume

• Creazione di un LV utilizzando la dimensione massima disponibile nel VG

lvcreate -n <logical-volume-name> -l 100%FREE <volume-group-name>

• Creazione di un LV indicando la dimensione iniziale del LV a 8Gb

lvcreate -n <logical-volume-name> -L8G <volume-group-name>

Creare un file-system in un LV esistente

mkfs -t ext4 /dev/mapper/lv-name

UUID di un volume e mount automatico

Per ottenere il UUID di un volume, utilizzare il seguente comando

blkid

Per attivare il mount automatico, editare il file

/etc/fstab

Shrinking a logical volume

Before shrinking the volume must be unmounted.

umount /dev/mapper/volume_lv
lvresize --resizefs -L<NEWSIZE> /dev/mapper/volume_lv
mount /dev/mapper/volume_lv

Extending a logical volume (and corresponding filesystem)

lvresize --resizefs -L<NEWSIZE> /dev/mapper/volume_lv

Example (extend vgData-lvdocker_volumes by 4GB):

lvresize --resizefs -L+4G /dev/mapper/vgData-lvdocker_volumes

oppure

lvextend --resizefs -L+4G /dev/mapper/vgData-lvdocker_volumes

Extending a logical volume in a virtual machine running Red Hat, Cent OS or OpenSUSe

Purpose
This article provides steps for extending a volume group created with Logical Volume Manager (LVM) in a virtual machine running Red Hat/Cent OS/OpenSUSe.
Resolution
Create a new disk then rescan devices.

Run this command to convert the new disk to a physical volume:

Note: The number for the sda can change depending on system setup. Use the sda number that was created in step 5.

# pvcreate /dev/sda3

Run this command to extend the physical volume:

# vgextend VolGroup00 /dev/sda3

Note: To determine which volume group to extend, use the command vgdisplay.

Run this command to verify how many physical extents are available to the Volume Group:

# vgdisplay VolGroup00 | grep "Free"

Run the following command to extend the Logical Volume:

# lvextend -L+#G /dev/VolGroup00/LogVol00

Where # is the number of Free space in GB available as per the previous command. Use the full number output from Step 10 including any decimals. Or use:

# lvextend -l +100%FREE /dev/VolGroup00/LogVol00

to extend to max size available.

Note: to determine which logical volume to extend, use the command lvdisplay.

Run the following command to expand the ext3 filesystem online, inside of the Logical Volume:

# resize2fs /dev/VolGroup00/LogVol00

Note: Use ext2online instead of resize2fs if it is a Red Hat virtual machine.

Run the following command to verify that the / filesystem has the new space available:

# df -h /

Altre fonti di informazione

Puoi trovare altre informazioni utili e complete in questo articolo.