Veritas Volume Manager 5.0 Migration Guide, HP-UX 11i v3, First Edition, May 2008

63Command differences
Comparison of LVM and VxVM tasks
LVM Set up alternate links to a physical
volume.
If a disk has two controllers, you
can make one primary and the
other an alternate link.
vgcreate /dev/vol_grp
\ /dev/dsk/
disk_name /dev/dsk/disk_name_2
To remove the link:
vgreduce /dev/vol_grp /dev/dsk/
disk_name
VxVM The Multipathing disk devices in
the Volume Manager represent
virtual devices with one or more
physical access paths to a
particular physical disk. Dynamic
Multipathing provides reliability of
disk access by dynamically
switching to another physical path
in the event of failure of a path.
The DMP feature in VxVM sets up links
automatically. It is not required to set up
links separately.
Refer to the manual page vxdmp (7) and
the Veritas Volume Manager
Administrator’s Guide for more
information on DMP.
LVM Create a mirrored logical volume. lvcreate -l num_log_extents -m 1 \
-n mirr_lv /dev/vol_grp
VxVM Create a mirrored volume/plex
or add a mirror to an existing
volume.
vxassist make vol_name length
layout=mirror
LVM Reduce a single/double mirrored
logical volume to an unmirrored
logical volume.
Remove a mirrored logical volume.
lvreduce -m 0 /dev/vol_grp/mirr_lv
lvremove /dev/vol_grp/mirr_lv
VxVM Remove mirrors or reduce the
number of plexes/mirrors.
Remove a volume with the plexes
associated with it.
vxplex -o rm dis plex_name
vxedit -rf rm vol_name
Table 3-2 LVM and VxVM task comparison
Task
type
Description Example
Example for a disk_group = veritasdg, medianame = disk01, vol_name -= veritasvol, plex name
= veritasvol-01, subdisk -= disk01-01, devicename = c0t0d0.