VERITAS Volume Manager 4.1 Migration Guide

VxVM and LVM
Coexistence of VxVM and LVM Disks
Chapter 1 7
Coexistence of VxVM and LVM Disks
Both LVM disks and VxVM disks can exist together on a system. The LVM disks are detected
and displayed as such by VxVM. LVM disks are not selected by VxVM for initialization,
addition, or replacement.
Export Deport
In LVM, exporting removes volume group information from /etc/lvmtab. The volume
group must have already been deactivated.
Similarly in VxVM, deport makes a disk group inaccessible by the system.
Import Import
In LVM, import adds a volume group to the system and the volume group information
to /etc/lvmtab but does not make the volumes accessible. The volume group must be
activated by the vgchange -a y command in order to make volumes accessible.
In VxVM, import imports a disk group and makes the diskgroup accessible by the
system.
Bad Block Pool No similar term
In LVM, the bad block pool provides for the transparent detection of bad disk sectors,
and the relocation of data from bad to good disk sectors. The bad block reallocation
feature does not exist in VxVM because the vectoring of bad blocks is now done by
most hardware.
/etc/lvmtab No similar term
/etc/lvmtab is a file that contains information about volume groups that are
accessible by a system.
Table 1-1 A Conceptual comparison of LVM and VxVM (Continued)
LVM Term VxVM Term
LVM VxVM