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6.2. Creating a Striped Logical Volume

This example creates an LVM striped logical volume called striped_logical_volume that stripes data across the disks at /dev/sda1, /dev/sdb1, and /dev/sdc1.

6.2.1. Creating the Physical Volumes
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Label the disks you will use in the volume groups as LVM physical volumes.

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
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6.2.2. Creating the Volume Group
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The following command creates the volume group volgroup01. 
# vgcreate volgroup01 /dev/sda1 /dev/sdb1 /dev/sdc1
  Volume group "volgroup01" successfully created
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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
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6.2.3. Creating the Logical Volume
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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 -i3 -I4 -L2G -nstriped_logical_volume volgroup01
  Rounding size (512 extents) up to stripe boundary size (513 extents)
  Logical volume "striped_logical_volume" created
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6.2.4. Creating the File System
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The following command creates a GFS file system on the logical volume. 
#  gfs_mkfs -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
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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
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