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 Volume creation options

It is possible to specify additional volume configuration options on a per-volume basis by specifying volume metadata. The volume is created using the specified options. Changing the metadata after the volume is created has no effect. The following table lists the volume creation options supported by the GPFS volume driver.

Table 1.12. Volume Create Options for GPFS Volume Drive
Metadata Item Name Description
fstype Specifies whether to create a file system or a swap area on the new volume. If fstype=swap is specified, the mkswap command is used to create a swap area. Otherwise the mkfs command is passed the specified file system type, for example ext3, ext4 or ntfs.
fslabel Sets the file system label for the file system specified by fstype option. This value is only used if fstype is specified.

Specifies the GPFS storage pool to which the volume is to be assigned. Note: The GPFS storage pool must already have been created.


Specifies how many copies of the volume file to create. Valid values are 1, 2, and, for GPFS V3.5.0.7 and later, 3. This value cannot be greater than the value of the MaxDataReplicas attribute of the file system.


Enables or disables the Direct I/O caching policy for the volume file. Valid values are yes and no.


Specifies the allocation policy to be used for the volume file. Note: This option only works if allow-write-affinity is set for the GPFS data pool.


Specifies how many blocks are laid out sequentially in the volume file to behave as a single large block. Note: This option only works if allow-write-affinity is set for the GPFS data pool.


Specifies the range of nodes (in GPFS shared nothing architecture) where replicas of blocks in the volume file are to be written. See GPFS: Administration and Programming Reference for more details on this option.

 Example: Volume creation options

This example shows the creation of a 50GB volume with an ext4 file system labeled newfs and direct IO enabled:

$ cinder create --metadata fstype=ext4 fslabel=newfs dio=yes --display-name volume_1 50 
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