5.2. Creating a Striped Logical Volume

This example procedure creates an LVM striped logical volume called striped_logical_volume that stripes data across the disks at /dev/sda1, /dev/sdb1, and /dev/sdc1.
  1. Label the disks you will use in the volume group as LVM physical volumes with the pvcreate command.

    Warning

    This command destroys any data on /dev/sda1, /dev/sdb1, and /dev/sdc1.
    # pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1
      Physical volume "/dev/sda1" successfully created
      Physical volume "/dev/sdb1" successfully created
      Physical volume "/dev/sdc1" successfully created
    
  2. Create the volume group volgroup01. The following command creates the volume group volgroup01.
    # vgcreate volgroup01 /dev/sda1 /dev/sdb1 /dev/sdc1
      Volume group "volgroup01" successfully created
    
    You can use the vgs command to display the attributes of the new volume group.
    # vgs
      VG                #PV #LV #SN Attr   VSize  VFree
      volgroup01          3   0   0 wz--n- 51.45G 51.45G
    
  3. Create a striped logical volume from the volume group you have created. 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.
    # lvcreate -i 3 -I 4 -L 2 G -n striped_logical_volume volgroup01
      Rounding size (512 extents) up to stripe boundary size (513 extents)
      Logical volume "striped_logical_volume" created
    
  4. Create a file system on the striped logical volume. The following command creates a GFS2 file system on the logical volume.
    # mkfs.gfs2 -p lock_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.
    # mount /dev/volgroup01/striped_logical_volume /mnt
    # 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