HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (March 2008)
Changed Features
The following features have changed in the March 2008 release of LVM and MirrorDisk/UX:
vgcreate Autocreation of Volume Group File
The vgcreate command now automatically creates the device file /dev/vgname/group to
manage the volume group, regardless of the volume group version.
If you want to specify the minor number of the group file, create /dev/vgname/group before
running the vgcreate command. To create the volume group device file, follow these steps:
1. Create a directory for the volume group. For example:
# mkdir /dev/vgname
By convention, vgname is vgnn, where nn is a unique number across all volume groups.
However, you can choose any unique name up to 255 characters.
2. Create a device file named group in the volume group directory with the mknod command.
For example:
# mknod /dev/vgname/group c major minor
The c following the device file name specifies that group is a character device file.
major is the major number for the group device file. For a Version 1.0 volume group, it is
64. For a Version 2.0 volume group, it is 128.
minor is the minor number for the group file in hexadecimal. For a Version 1.0 volume
group, minor has the form 0xnn0000, where nn is a unique number across all Version 1.0
volume groups. For a Version 2.0 volume group, minor has the form 0xnnn000, where
nnn is a unique number across all Version 2.0 volume groups.
For more information on mknod, see mknod(1M); for more information on major numbers
and minor numbers, see HP-UX System Administrator's Guide: Logical Volume Management.
vgremove Removal of Volume Group File
The vgremove command now supports a -X option to remove the volume group device files
in /dev.
Display Enhancements
The lvdisplay, pvdisplay, vgdisplay and vgcfgrestore commands display additional
information.
• vgdisplay displays the volume group version, the maximum size to which the volume
group can grow, and the maximum number of physical extents. For example:
# vgdisplay vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 7
Open LV 7
Max PV 16
Cur PV 1
Act PV 1
Max PE per PV 4328
VGDA 2
PE Size (Mbytes) 16
Total PE 4319
Alloc PE 4318
Free PE 1
Total PVG 0
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