Converting volumes This chapter discusses converting compatibility volumes to EVMS
volumes and converting EVMS volumes to compatibility volumes. For a discussion
of the differences between compatibility and EVMS volumes, see .When to convert volumesThere are several different scenarios that might help you determine
what type of volumes you need.
For example, if you wanted persistent names or to make full use of
EVMS features, such as Drive Linking or Snapshotting, you would convert
your compatibility volumes to EVMS volumes.
In another situation, you might decide that a volume needs to be
read by a system that understands the underlying volume management scheme.
In this case, you would convert your EVMS volume to a
compatibility volume.A volume can only be converted when it is offline.
This means the volume must be unmounted and otherwise not in use.
The volume must be unmounted because the conversion operation changes both
the name and the device number of the volume.
Once the volume is converted, you can remount it using its new name.Example: convert compatibility volumes to EVMS volumesA compatibility volume
can be converted to an EVMS volume in the following situations:
The compatibility volume has no file system (FSIM) on it.The compatibility volume has a file system, but the file system can be shrunk (if necessary) to make
room for the EVMS metadata.This section provides a detailed explanation of how to convert compatibility
volumes to EVMS volumes and provides instructions to help you complete the following task.
Convert a compatibility volumeYou have a compatibility volume /dev/evms/hda3
that you want to make into an EVMS volume named my_vol.
Using the EVMS GUIFollow these steps to convert a compatibility volume with the EVMS GUI:Choose ActionConvert Compatibility Volume to EVMS. Select /dev/evms/hda3
from the list of available volumes.Type my_vol in the name field.Click the Convert button
to convert the volume.Alternatively, you can perform some of the steps to convert the volume from the GUI
context sensitive menu:From the Volumes tab, right click
on /dev/evms/hda3.Click Convert to EVMS Volume...Continue to convert the volume beginning with step 3 of the GUI
instructions.Using NcursesFollow these instructions to convert a compatibility volume to an EVMS volume
with the Ncurses
interface:Choose ActionsConvertCompatibility Volume to EVMS VolumeSelect /dev/evms/hda3 from the list
of available volumes.Type my_vol when prompted for the name.
Press Enter.Activate Convert.Alternatively, you can perform some of the steps to convert the volume from the
context sensitive menu:From the Volumes view, press Enter on /dev/evms/hda3.Activate the Convert to EVMS Volume menu item.Continue to convert the volume beginning with step 3 of the Ncurses
instructions.Using the CLITo convert a volume, use the Convert command.
The Convert command takes the name of a volume as its first argument, and
then for what you want to name the new volume
as the second argument. To complete the example and convert a volume, type the
following command at the EVMS: prompt:convert: /dev/evms/hda3, Name=my_volExample: convert EVMS volumes to compatibility volumesAn EVMS volume can be converted to a compatibility volume only if the volume does not have EVMS
features on it. This section provides a detailed explanation of how to convert EVMS volumes to compatibility volumes
by providing instructions to help you complete the following task.
Convert an EVMS volumeYou have an EVMS volume, /dev/evms/my_vol,
that you want to make a compatibility volume.
Using the EVMS GUIFollow these instructions to convert an EVMS volume to a compatibility
volume with the EVMS GUI:Choose ActionConvert EVMS Volume to Compatibility Volume. Select /dev/evms/my_vol
from the list of available volumes.Click the Convert button
to convert the volume.Alternatively, you can perform some of the steps to convert the volume through
the GUI context sensitive menu:From the Volumes tab, right click
/dev/evms/my_vol.Click Convert to Compatibility Volume...Continue converting the volume beginning with step 3 of the
GUI instructions.Using NcursesFollow these instructions to convert an EVMS volume to a compatibility volume
with the Ncurses interface:Choose ActionsConvertEVMS Volume to
Compatibility VolumeSelect /dev/evms/my_vol from the
list of available volumes.Activate Convert.
Alternatively, you can perform some of the steps to convert the volume through
the context sensitive menu:From the Volumes view, press Enter on /dev/evms/my_vol.Activate the Convert to Compatibility Volume menu item.Continue to convert the volume beginning with step 3 of the Ncurses
instructions.Using the CLITo convert a volume use the Convert command.
The Convert command takes the name of a volume as its first argument, and
the keyword to indicate a change to a compatibility volume
as the second argument. To complete the example and convert a volume, type the
following command at the EVMS: prompt:convert: /dev/evms/my_vol, compatibility