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.
| 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. |
data_pool_name |
Specifies the GPFS storage pool to which the volume is to be assigned. Note: The GPFS storage pool must already have been created. |
replicas |
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 |
dio |
Enables or disables the Direct I/O caching
policy for the volume file. Valid values
are |
write_affinity_depth |
Specifies the allocation policy to be used
for the volume file. Note: This option
only works if |
block_group_factor |
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 |
write_affinity_failure_group |
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. |
