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---
author:
- Bryan Gurney (@bgurney-rh)
module: vdo
short_description: Module to control VDO
version_added: "2.5"
description:
- This module controls the VDO dedupe and compression device.
- VDO, or Virtual Data Optimizer, is a device-mapper target that
provides inline block-level deduplication, compression, and
thin provisioning capabilities to primary storage.
options:
name:
description:
- The name of the VDO volume.
type: str
required: true
state:
description:
- Whether this VDO volume should be "present" or "absent".
If a "present" VDO volume does not exist, it will be
created. If a "present" VDO volume already exists, it
will be modified, by updating the configuration, which
will take effect when the VDO volume is restarted.
Not all parameters of an existing VDO volume can be
modified; the "statusparamkeys" list contains the
parameters that can be modified after creation. If an
"absent" VDO volume does not exist, it will not be
removed.
type: str
required: true
choices: [ absent, present ]
default: present
activated:
description:
- The "activate" status for a VDO volume. If this is set
to "no", the VDO volume cannot be started, and it will
not start on system startup. However, on initial
creation, a VDO volume with "activated" set to "off"
will be running, until stopped. This is the default
behavior of the "vdo create" command; it provides the
user an opportunity to write a base amount of metadata
(filesystem, LVM headers, etc.) to the VDO volume prior
to stopping the volume, and leaving it deactivated
until ready to use.
type: bool
running:
description:
- Whether this VDO volume is running.
- A VDO volume must be activated in order to be started.
type: bool
device:
description:
- The full path of the device to use for VDO storage.
- This is required if "state" is "present".
type: str
logicalsize:
description:
- The logical size of the VDO volume (in megabytes, or
LVM suffix format). If not specified for a new volume,
this defaults to the same size as the underlying storage
device, which is specified in the 'device' parameter.
Existing volumes will maintain their size if the
logicalsize parameter is not specified, or is smaller
than or identical to the current size. If the specified
size is larger than the current size, a growlogical
operation will be performed.
type: str
deduplication:
description:
- Configures whether deduplication is enabled. The
default for a created volume is 'enabled'. Existing
volumes will maintain their previously configured
setting unless a different value is specified in the
playbook.
type: str
choices: [ disabled, enabled ]
compression:
description:
- Configures whether compression is enabled. The default
for a created volume is 'enabled'. Existing volumes
will maintain their previously configured setting unless
a different value is specified in the playbook.
type: str
choices: [ disabled, enabled ]
blockmapcachesize:
description:
- The amount of memory allocated for caching block map
pages, in megabytes (or may be issued with an LVM-style
suffix of K, M, G, or T). The default (and minimum)
value is 128M. The value specifies the size of the
cache; there is a 15% memory usage overhead. Each 1.25G
of block map covers 1T of logical blocks, therefore a
small amount of block map cache memory can cache a
significantly large amount of block map data. Existing
volumes will maintain their previously configured
setting unless a different value is specified in the
playbook.
type: str
readcache:
description:
- Enables or disables the read cache. The default is
'disabled'. Choosing 'enabled' enables a read cache
which may improve performance for workloads of high
deduplication, read workloads with a high level of
compression, or on hard disk storage. Existing
volumes will maintain their previously configured
setting unless a different value is specified in the
playbook.
- The read cache feature is available in VDO 6.1 and older.
type: str
choices: [ disabled, enabled ]
readcachesize:
description:
- Specifies the extra VDO device read cache size in
megabytes. This is in addition to a system-defined
minimum. Using a value with a suffix of K, M, G, or T
is optional. The default value is 0. 1.125 MB of
memory per bio thread will be used per 1 MB of read
cache specified (for example, a VDO volume configured
with 4 bio threads will have a read cache memory usage
overhead of 4.5 MB per 1 MB of read cache specified).
Existing volumes will maintain their previously
configured setting unless a different value is specified
in the playbook.
- The read cache feature is available in VDO 6.1 and older.
type: str
emulate512:
description:
- Enables 512-byte emulation mode, allowing drivers or
filesystems to access the VDO volume at 512-byte
granularity, instead of the default 4096-byte granularity.
Default is 'disabled'; only recommended when a driver
or filesystem requires 512-byte sector level access to
a device. This option is only available when creating
a new volume, and cannot be changed for an existing
volume.
type: bool
growphysical:
description:
- Specifies whether to attempt to execute a growphysical
operation, if there is enough unused space on the
device. A growphysical operation will be executed if
there is at least 64 GB of free space, relative to the
previous physical size of the affected VDO volume.
type: bool
default: false
slabsize:
description:
- The size of the increment by which the physical size of
a VDO volume is grown, in megabytes (or may be issued
with an LVM-style suffix of K, M, G, or T). Must be a
power of two between 128M and 32G. The default is 2G,
which supports volumes having a physical size up to 16T.
The maximum, 32G, supports a physical size of up to 256T.
This option is only available when creating a new
volume, and cannot be changed for an existing volume.
type: str
writepolicy:
description:
- Specifies the write policy of the VDO volume. The
'sync' mode acknowledges writes only after data is on
stable storage. The 'async' mode acknowledges writes
when data has been cached for writing to stable
storage. The default (and highly recommended) 'auto'
mode checks the storage device to determine whether it
supports flushes. Devices that support flushes will
result in a VDO volume in 'async' mode, while devices
that do not support flushes will run in sync mode.
Existing volumes will maintain their previously
configured setting unless a different value is
specified in the playbook.
type: str
choices: [ async, auto, sync ]
indexmem:
description:
- Specifies the amount of index memory in gigabytes. The
default is 0.25. The special decimal values 0.25, 0.5,
and 0.75 can be used, as can any positive integer.
This option is only available when creating a new
volume, and cannot be changed for an existing volume.
type: str
indexmode:
description:
- Specifies the index mode of the Albireo index. The
default is 'dense', which has a deduplication window of
1 GB of index memory per 1 TB of incoming data,
requiring 10 GB of index data on persistent storage.
The 'sparse' mode has a deduplication window of 1 GB of
index memory per 10 TB of incoming data, but requires
100 GB of index data on persistent storage. This option
is only available when creating a new volume, and cannot
be changed for an existing volume.
type: str
choices: [ dense, sparse ]
ackthreads:
description:
- Specifies the number of threads to use for
acknowledging completion of requested VDO I/O operations.
Valid values are integer values from 1 to 100 (lower
numbers are preferable due to overhead). The default is
1. Existing volumes will maintain their previously
configured setting unless a different value is specified
in the playbook.
type: str
biothreads:
description:
- Specifies the number of threads to use for submitting I/O
operations to the storage device. Valid values are
integer values from 1 to 100 (lower numbers are
preferable due to overhead). The default is 4.
Existing volumes will maintain their previously
configured setting unless a different value is specified
in the playbook.
type: str
cputhreads:
description:
- Specifies the number of threads to use for CPU-intensive
work such as hashing or compression. Valid values are
integer values from 1 to 100 (lower numbers are
preferable due to overhead). The default is 2.
Existing volumes will maintain their previously
configured setting unless a different value is specified
in the playbook.
type: str
logicalthreads:
description:
- Specifies the number of threads across which to
subdivide parts of the VDO processing based on logical
block addresses. Valid values are integer values from
1 to 100 (lower numbers are preferable due to overhead).
The default is 1. Existing volumes will maintain their
previously configured setting unless a different value
is specified in the playbook.
type: str
physicalthreads:
description:
- Specifies the number of threads across which to
subdivide parts of the VDO processing based on physical
block addresses. Valid values are integer values from
1 to 16 (lower numbers are preferable due to overhead).
The physical space used by the VDO volume must be
larger than (slabsize * physicalthreads). The default
is 1. Existing volumes will maintain their previously
configured setting unless a different value is specified
in the playbook.
type: str
notes:
- In general, the default thread configuration should be used.
requirements:
- PyYAML
- kmod-kvdo
- vdo
s�
- name: Create 2 TB VDO volume vdo1 on device /dev/md0
vdo:
name: vdo1
state: present
device: /dev/md0
logicalsize: 2T
- name: Remove VDO volume vdo1
vdo:
name: vdo1
state: absent
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