VERITAS Volume Manager 3.1 Migration Guide

Command Differences

Existing Features in LVM not supported in VxVM

Chapter 380

Existing Features in LVM not supported in

VxVM

Some of the existing features in LVM are not supported in the current

release of VxVM. Given below is a table with the unsupported LVM

features, and possible workarounds in VxVM.

Table 3-4LVM features and VxVM equivalents

LVM Feature VxVM Equivalent

Physical volume groups VxVM has no equivalent feature. The

disk group feature of VxVM combines

the logical volume group (VG) and

physical volume group (PVG) of LVM.

Mirror split/fast remerge—this feature

is mainly used for online backups.

Online backup in VxVM is achieved by

capturing a snapshot of a volume. Refer

to Table 3-3, Additional VxVM Tasks

with no LVM equivalents, for the

command to create a snapshot copy of a

volume.

VxFS online backup/snapshot feature

provides similar capability, through the

mount command.

Mirror re-merge is not supported at

present, but mirrors can be added to a

volume using the vxassist command.

Refer to the respective manpages of

commands for more details.

Powerfail timeout feature:

Automatically re-enable a disk or a path

to a disk, after temporary error

condition (resulting in

EPOWERF error on I/Os) disappears on

that disk or path.

Powerfail timeout feature: After the

EPOWERF error condition disappears,

the reconﬁguration command must be

run manually to re-enable the paths and

the disks which were disabled due to

EPOWERF error. See the pfto feature

in the vxdctl command manual pages

for more information.