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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
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
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
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
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
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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