Installation guide

Creating the Logical Volume

You can use the vgs command to display the attributes of the new volume group.

[root@tng3-1 ~]# vgs

VG #PV #LV #SN Attr VSize VFree

volgroup01 3 0 0 wz--n- 51.45G 51.45G

5.2.3. Creating the Logical Volume

The following command creates the striped logical volume striped_logical_volume from the

volume group volgroup01. This example creates a logical volume that is 2 gigabytes in size, with

three stripes and a stripe size of 4 kilobytes.

[root@tng3-1 ~]# lvcreate -i3 -I4 -L2G -nstriped_logical_volume volgroup01

Rounding size (512 extents) up to stripe boundary size (513 extents)

Logical volume "striped_logical_volume" created

5.2.4. Creating the File System

The following command creates a GFS2 file system on the logical volume.

[root@tng3-1 ~]# mkfs.gfs2 -plock_nolock -j 1 /dev/volgroup01/striped_logical_volume

This will destroy any data on /dev/volgroup01/striped_logical_volume.

Are you sure you want to proceed? [y/n] y

Device: /dev/volgroup01/striped_logical_volume

Blocksize: 4096

Filesystem Size: 492484

Journals: 1

Resource Groups: 8

Locking Protocol: lock_nolock

Lock Table:

Syncing...

All Done

The following commands mount the logical volume and report the file system disk space usage.

[root@tng3-1 ~]# mount /dev/volgroup01/striped_logical_volume /mnt

[root@tng3-1 ~]# df

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

13902624 1656776 11528232 13% /

/dev/hda1 101086 10787 85080 12% /boot

tmpfs 127880 0 127880 0% /dev/shm

/dev/volgroup01/striped_logical_volume

1969936 20 1969916 1% /mnt

5.3. Splitting a Volume Group

In this example, an existing volume group consists of three physical volumes. If there is enough

unused space on the physical volumes, a new volume group can be created without adding new disks.