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182 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2
13.1.4 Create the logical volume and file system
The overall steps involved in creating a logical volume are:
򐂰 Create physical volumes from the two DASD.
򐂰 Create a single volume group.
򐂰 Create a single logical volume.
򐂰 Make a file system from the logical volume.
Figure 13-1 shows a block diagram of the logical volume manager (LVM) reflecting this
example.
Figure 13-1 Logical volume manager (LVM) block diagram
Creating physical volumes from the two DASDs
The pvcreate command initializes DASD for use by LVM. Initialize the two new DASD
partitions. Verify with the pvdisplay command:
# pvcreate /dev/dasdd1 /dev/dasde1
Physical volume "/dev/dasdd1" successfully created
Physical volume "/dev/dasde1" successfully created
# pvdisplay
--- NEW Physical volume ---
PV Name /dev/dasdd1
VG Name
PV Size 4.59 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID eksaUw-HvSX-S9m8-a5uO-RBOn-fMH7-y6fkRb
Volume Group - optvg
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Extent (PE)
Physical Volume - /dev/dasdd1
Physical Volume - /dev/dasdc1
Logical Volume - optlv (/dev/optvg/optlv)
ext3 file system
mounted over /opt/
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