logical volume

A logical volume consists of an array of identically sized logical partitions. The partition size of a logical volume is determined by the volume group that contains it, and is the same as the volume group's physical partition size. Contiguous logical partitions within a logical volume may map to discontiguous physical partitions, possibly distributed across multiple physical volumes. A logical volume may be configured so that its logical partitions are mirrored to protect data from hardware failures. Mirroring may be configured so that each logical partition maps to either 2 or 3 physical partition mirrors.

Creation
Properties
Casts

Version	Platforms
8.0.584.0	AIX

Creation

logical volume <string> of <volume group> : logical volume

Returns a logical volume within the specified volume group whose "name" property matches the given string.

Plural: logical volumes

Version	Platforms
8.0.584.0	AIX

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logical volume of <filesystem> : logical volume

On an AIX system, returns the logical volume corresponding to the given filesystem.

Plural: logical volumes

Version	Platforms
8.0.584.0	AIX

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logical volume of <volume group> : logical volume

On an AIX system, returns the logical volume corresponding to the specified volume group.Example: logical volumes of volume group "joe" of logical volume manager - Returns a list of the logical volumes in the specified volume group.Example: number of logical volumes of volume group "dave" of logical volume manager - Returns the number of logical volumes in the specified volume group.Example: logical volumes of volume groups of logical volume manager - Returns the list of all the logical volumes in the logical volume manager.

Plural: logical volumes

Version	Platforms
8.0.584.0	AIX

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Properties

label of <logical volume> : string

Returns the label of the specified logical volume. If the logical volume contains a filesystem, then then this will be the full pathname of the mount point of the file system, eg. "/home".Example: label of logical volume "splat" of volume group "dave" of logical volume manager - Returns the label associated with the specified logical volume, such as "/splat_mount_point".

Plural: labels

Version	Platforms
8.0.584.0	AIX

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maximum partition count of <logical volume> : integer

Returns the maximum number of logical partitions that the specified logical volume contains. A system administrator may set this value to prevent a logical volume from growing beyond a given size.Example: maximum partition count of logical volume "splat" of volume group "dave" of logical volume manager - Returns the maximum partition count that has been set for the specified volume.

Plural: maximum partition counts

Version	Platforms
8.0.584.0	AIX

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minor number of <logical volume> : integer

Returns the minor number of the specified volume group. Each logical volume is represented by a device special file (located in directory /etc). The major number of the device special file is associated with the volume group containing the logical volume, and the minor number of the device special file is associated with the logical volume.

Plural: minor numbers

Version	Platforms
8.0.584.0	AIX

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mirror count of <logical volume> : integer

Returns the number of mirrors that the logical volume has (a value between 1 and 3).Example: mirror count of logical volume "splat" of volume group "dave" of logical volume manager - Returns the number of mirrors set up for the specified volume.

Plural: mirror counts

Version	Platforms
8.0.584.0	AIX

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name of <logical volume> : string

On an AIX system, returns the name of the logical volume, eg. "hd1".

Plural: names

Version	Platforms
8.0.584.0	AIX

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partition count of <logical volume> : integer

Returns the number of partitions in the specified logical volume. If mirroring is not enabled for the logical volume, then each logical partition maps to a physical partition within the logical volume's volume group. If the logical volume is mirrored, then each logical partition maps to multiple physical partitions within the logical volume group. In this case, the total number of physical partitions occupied by the logical volume will be the product of the partition count and the mirror count.Example: partition count of logical volume "splat" of volume group "dave" of logical volume manager - Returns the number of partitions existing on the specified logical volume.

Plural: partition counts

Version	Platforms
8.0.584.0	AIX

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volume group of <logical volume> : volume group

Returns the volume group that contains the given logical volume.

Plural: volume groups

Version	Platforms
8.0.584.0	AIX

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Casts

<logical volume> as string : string

Casts an AIX logical volume as a string type.

Version	Platforms
8.0.584.0	AIX

permalink source