ansible-raid
Creates a RAID (using mdraid or lvmraid) and optional VDO layer.
Requirements
This role makes use of modules found in the ansible.posix and community.general collections.
VDO
Optionally adds a VDO layer, tuned according to the resulting RAID device. In the case of an lvmraid, lvmvdo is used.
Please note that lvmvdo is still an experimental feature of LVM!
Tuning values are based on those recommended by the RHEL 8 VDO documentation. The values for the "raid_vdo_purpose" configuration variable come from Section 1.8 of the guide:
Replace logical-size with the amount of logical storage that the VDO volume should present:
- For active VMs or container storage, use logical size that is ten times the physical size of your block device. For example, if your block device is 1TB in size, use 10T here.
- For object storage, use logical size that is three times the physical size of your block device. For example, if your block device is 1TB in size, use 3T here.
Options
Set the following as vars for your role. Options in bold are required. Choices in bold indicate the default.
| Option | Choices | Comments |
|---|---|---|
| raid_level | raid0, raid1, raid5, raid6, raid10 | |
| raid_block_devs | No default | A list of block devices (e.g. [ sdb, sdc, sdd, sde ] ) |
| raid_name | No default | For mdraid, this will become /dev/md/<raid_name> while lvmraid will use <raid_name>_lv, <raid_name>_vg, etc. |
| raid_state | present, absent | Whether to create or destroy the RAID array |
| raid_backend | mdraid, lvmraid | |
| raid_create_vdo | yes, no | If yes, this creates a VDO layer on your RAID. |
| raid_vdo_purpose | virtualization, object_storage | Choosing "virtualization" creates a logical layer 10x the size of the backing device, while "object_storage" creates a logical layer 3x the size of the backing device. |
| raid_vdo_custom_size | No default | Instead of using the multipliers predefined in vdo_purpose, you may specify a custom size. (e.g. 6 TB, 40 GB, etc.) |
| raid_create_fs | yes, no | Formats the resulting device with the XFS file system. Chunk size and stripe width are automatically tuned to the backing storage and RAID-type you choose. However, if you use VDO, it will simply use the defaults. |
| raid_add_to_fstab | yes, no | Mounts the resulting device and adds it to your /etc/fstab |
| raid_mountpoint | /mnt/<raid_name> |
Where the resulting device will be mounted |
Sample Playbook
- hosts: raid-test.example.com
roles:
- role: raid
raid_level: raid10
raid_name: my_cool_raid
raid_block_devs: [ sdb, sdc, sdd, sde ]
raid_backend: lvmraid
raid_use_vdo: yes
raid_add_to_fstab: no