HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide (T5278-96 - Page 25

Creating logical volumes, must be unmounted before executing

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9. Use vgdisplay -v to verify that the volume group was created correctly. The -v option displays the detailed volume group information. Example # vgdisplay -v /dev/vg06 - - - Volume groups - - - VG Name /dev/vg06 VG Write Access read/write VG Status available Max LV 255 Cur LV 0 Open LV 0 Max PV 16 Cur PV 1 Act PV 1 Max PE per PV 1016 VGDA 2 PE Size (Mbytes) 4 Total PE 586 Alloc PE 0 Free PE 586 Total PVG 0 - - Physical Volumes - - PV Name /dev/dsk/c6t0d0 PV Status available Total PE 586 Free PE 586 Creating logical volumes Use these commands for logical volume configuration: • lvremove Deletes a logical volume. Any file system attached to the logical volume must be unmounted before executing the lvremove command. Example lvremove /dev/vgnn/lvolx • lvextend Increases the size of an existing logical volume. Example lvextend -L size /dev/vgnn/lvolx • lvreduce Decreases the size of an existing logical volume. Any file system attached to the logical volume must be unmounted before executing the lvreduce command. Example lvreduce -L size /dev/vgnn/lvolx CAUTION: Data within the file system can be lost after execution of lvreduce. Create logical volumes after you create volume groups. A logical volume must be created for each new SCSI disk device. Configuring disk array devices 25

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9.
Use
vgdisplay
–
v
to verify that the volume group was created correctly. The
–
v
option
displays the detailed volume group information.
Example
# vgdisplay
–
v /dev/vg06
- - - Volume groups - - -
VG Name
/dev/vg06
VG Write Access
read/write
VG Status
available
Max LV
255
Cur LV
0
Open LV
0
Max PV
16
Cur PV
1
Act PV
1
Max PE per PV
1016
VGDA 2
PE Size (Mbytes)
4
Total PE
586
Alloc PE
0
Free PE
586
Total PVG
0
- - Physical Volumes - - -
PV Name /dev/dsk/c6t0d0
PV Status available
Total PE 586
Free PE 586
Creating logical volumes
Use these commands for logical volume configuration:
•
lvremove
Deletes a logical volume. Any file system attached to the logical volume must be unmounted
before executing the
lvremove
command.
Example
lvremove /dev/vgnn/lvolx
•
lvextend
Increases the size of an existing logical volume.
Example
lvextend
–
L size /dev/vgnn/lvolx
•
lvreduce
Decreases the size of an existing logical volume. Any file system attached to the logical volume
must be unmounted before executing the
lvreduce
command.
Example
lvreduce
–
L size /dev/vgnn/lvolx
CAUTION:
Data within the file system can be lost after execution of
lvreduce
.
Create logical volumes after you create volume groups. A logical volume must be created for each
new SCSI disk device.
Configuring disk array devices
25