Creating volumesThis chapter discusses when and how to create volumes.When to create a volumeEVMS treats volumes and storage objects separately.
A storage object does not automatically
become a volume; it must be made into a volume.Volumes are created from storage objects.
Volumes are either EVMS native volumes or compatibility volumes. Compatibility volumes
are intended to be compatible with a volume manager other than EVMS, such as the Linux
LVM, MD, OS/2 or AIX. Compatibility volumes might have restrictions on what EVMS can do with
them. EVMS native volumes have no such restrictions, but they can be used only by an
EVMS equipped system. Volumes are mountable and can contain file systems.EVMS native volumes contain EVMS-specific information to identify
the volume name. After this volume information is
applied, the volume is no longer fully backward compatible
with existing volume types.Instead of
adding EVMS metadata to an existing object, you can tell EVMS to make an object directly available as a volume. This type of
volume is known as a compatibility volume. Using this method, the final product is fully
backward-compatible with the desired system. Example: create an EVMS native volumeThis section provides a detailed explanation of how to create an EVMS native
volume with EVMS by providing instructions to help you complete the following task.
Create an EVMS native volume Create an EVMS native volume called "Sample Volume" from the region, /lvm/Sample Container/Region, you created in .
Using the EVMS GUIFollow these instructions to create an EVMS volume:Select ActionsCreateEVMS Volume.Choose lvm/Sample Container/Sample Region.
Type Sample Volume in the
name field.Click Create.Alternatively, you can perform some of the steps to create an EVMS
volume from the GUI context sensitive menu:From the Available Options tab, right click
lvm/Sample Container/Sample Region.Click Create EVMS Volume...Continue beginning with step 3 of the GUI instructions.Using NcursesTo create a volume, follow these steps:
Select ActionsCreateEVMS Volume.Enter Sample Volume at the "name" prompt.
Press Enter.Activate Create.Alternatively, you can perform some of the steps to create an EVMS volume
from the context sensitive menu:From the Available Objects view, press Enter on
lvm/Sample Container/Sample Region.Activate the Create EVMS Volume menu item.Continue beginning with step 3 of the Ncurses instructions.Using the CLITo create a volume, use the Create command. The arguments
the Create command accepts vary depending on what is being created. In
the case of the example, the first argument is the key word that
specifies what is being created. The second argument is the object being made into a volume,
in this case .
The third argument is type specific for an EVMS
volume, , followed by what
you want to call the volume, in this case . The following command
creates the volume from the example. Create: Volume, "lvm/Sample Container/Sample Region", Name="Sample Volume"Example: create a compatibility volumeThis section provides a detailed explanation of how to create a compatibility
volume with EVMS by providing instructions to help you complete the following task.
Create a compatibility volumeCreate a compatibility volume called "Sample Volume" from
the region, /lvm/Sample Container/Region, you created in .
Using the GUITo create a compatibility volume, follow these steps:Select
ActionsCreateCompatibility Volume.
Choose the region lvm/Sample Container/Sample Region
from the list.Click the Create button.Click the Volume tab in the GUI to
see a volume named /dev/evms/lvm/Sample Container/Sample Region.
This volume is your compatibility volume.Alternatively, you can perform some of the steps to create a compatibility volume from
the GUI context sensitive menu:From the Available Objects tab, right click
lvm/Sample Container/Sample Region.Click Create Compatibility Volume...Continue beginning with step 3 of the GUI instructions.Using NcursesTo create a compatibility volume, follow these steps:Select ActionsCreateCompatibility Volume.Choose the region lvm/Sample Container/Storage Region from the list..
Activate Create.Alternatively, you can perform some of the steps to create a compatibility volume from
the context sensitive menu:From the Available Objects view, press Enter on
lvm/Sample Container/Sample Region.Activate the Create Compatibility Volume menu item.Continue beginning with step 3 of the Ncurses instructions.Using the CLITo create a volume, use the Create command. The arguments
the Create command accepts vary depending on what is being created. In
the case of the example, the first argument is the key word that
specifies what is being created. The second argument is the object being made into a volume,
in this case .
The third argument, , indicates that this is a compatibility
volume and should be named as such. Create:Volume,"lvm/Sample Container/Sample Region",compatibility