Use this page to create and configure one or more logical
volumes that you want to include in the volume group.
You must create and configure at least one logical volume for the
volume group. You can create and configure as many logical volumes
as allowed by the value that you selected for the Maximum
logical volumes property on the Name and configure
the volume group page of this wizard.
Fields
- Logical volume name
- Specify a name for the logical volume that is unique to the cluster.
The name you specify must consist of 1 - 32 characters. You can use
alphabetic characters of A - Z and a - z, numbers of 0 - 9, and the
underscore (_) character. Also, the name cannot begin with a number.
Note: If
you are using this logical volume in a mirroring configuration across
sites with Logical Volume Manager (LVM), include the site name as
part of the logical volume name. For example, you might use a name
such as LV1site1.
-
Logical volume type
- Select the type of logical volume to create based on one of the
following types of data you want to use on the logical volume:
- Journaled file system (JFS)
- Journaled file system 2 (JFS2)
- System dump (sysdump)
- Paging
- Journaled file system log (jfslog)
- aio_cache
- Boot
- Number of logical partitions
Specify the minimum number of logical partitions to
allocate to the logical volume. The value must be equal to, or less
than, the Maximum physical partitions property
that you specified on the Name and configure the volume group page
of this wizard. 
- Position on physical volume
Select the Intraphysical Volume Allocation Policy to
use for allocating physical partitions on a physical volume in the
logical volume. Select a strategy that is appropriate for the type
of logical volume that you are creating. The location strategy determines
the length of time for seeking and accessing data on the logical volume. Partition
allocation at the center of a physical volume is a good choice for
a paging space logical volume, if you expect much paging activity.
Partition allocation at the beginning or the end of the physical volume
is a good choice for system dump or boot logical volumes, which have
infrequent use. Logical volumes that you expect to have a high level
of data retrieval, or that an important application uses, are the
best candidates for partition allocation closer to the center of the
physical volumes.
- inner_edge
- outer_edge
- Select one of these values to allocate physical partitions to
the edges at the beginning and at the end of the physical volume.
Partitions in these positions have the slowest average seek times,
which generally result in longer response times for any application
that uses these partitions.
- inner_middle
- outer_middle
- Select one of these values to avoid allocating physical partitions
to the edges and out of the center of the physical volume. Select
either of these options to provide locations with reasonably good
average seek times and to ensure that most of the partitions on a
physical volume are available for allocation.
- center
- Select this value to allocate physical partitions to the center
section of each physical volume. Partitions in this position have
the fastest average seek times, which generally result in the best
response time for any application that uses them. However, fewer partitions
on a physical volume meet the criteria for this strategy than for
any other strategy.

- Range of physical volumes
- Select which Interphysical Volume Allocation Policy to use for
choosing physical devices to allocate the physical partitions of a
logical volume:
Minimum
- Select this policy to use the minimum number of physical volumes
for allocating the physical partitions of the logical volume.
If
you select this policy, and specify a value of 1 for
the Logical partition copies property, one
physical volume must contain all the physical partitions of this logical
volume, if possible. When a single physical volume is not possible,
the minimum number is used that is consistent with other settings
for the logical volume.
If you specify a value of 2 or 3 for
the Logical partition copies property, this
policy uses as many physical volumes as there are copies. Otherwise,
all physical partitions are contained within the minimum number of
physical volumes possible that is consistent with the other settings
that you select.
- Maximum
Select this policy to spread the physical partitions
of this logical volume over as many physical volumes as possible.
This policy is a performance-oriented option, which can improve availability
of the logical volume, in conjunction with the number of logical partition
copies.If not using copies, this policy might create a situation
in which the logical volume becomes incomplete by losing a physical
volume that contains a physical partition.

- Maximum number of physical volumes
- Specify the maximum number of physical volumes to be available
for new allocation to the logical volume. Select a value from 1 through
the total number of shared disks that you selected on the previous
page of this wizard.
- Interdisks allocation policy
Specifies that the logical volume must follow a superstrict
allocation policy. This policy requires that each copy of a logical
partition must be on a separate physical volume. This policy ensures
that partitions in one mirrored logical volume cannot share a physical
volume with the partitions from another mirrored logical volume. 
- Logical partitions copies
Specify the number of physical partitions to be allocated
to each logical partition. You can select a value of 1 - 3. The default
value is 1, and does not configure any additional
copies for the logical volume. A value of 2 or 3 indicates
a mirrored logical volume.
- Mirror pool for first copy
- Select the mirror pool to which to add the first copy of the logical
partition.
Note: These options are available only when the Volume
group type property is scalable. You also must enable
mirror pools, configure them to be strict or superstrict, and define
the mirror pool names on the Name and configure the volume group page
of this wizard.
- Mirror pool for second copy
- Select the mirror pool to which you want to add the second copy
of the logical partition. This option is available only when you specify
a value of 2 for the Logical partition
copies property.
- Mirror pool for third copy
- Select the mirror pool to which you want to add the third copy
of the logical partition. This option is available only when you specify
a value of 3 for the Logical partition
copies property.
Actions
- Add Another
- Click Add Another to add another set of
property fields so that you can configure another logical volume to
include in the volume group.
- Remove
- Click Remove to remove a configured logical
volume from the volume group and remove all content from the property
fields for that logical volume.