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46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * microshift_storage/volume-snapshots-microshift.adoc
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:_content-type: CONCEPT
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[id="microshift-storage-device-classes_{context}"]
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= Device classes
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You can create custom device classes by adding a `device-classes` array to your logical volume manager storage (LVMS) configuration. Add the array to the `/etc/microshift/lvmd.yaml` configuration file. A single device class must be set as the default. You must restart {product-title} for configuration changes to take effect.
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[WARNING]
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====
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Removing a device class while there are still persistent volumes or `VolumeSnapshotContent` objects connected to that device class breaks both thick and thin provisioning.
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====
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You can define multiple device classes in the `device-classes` array. These classes can be a mix of thick and thin volume configurations.
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.Example of a mixed `device-class` array
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[source,terminal]
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----
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socket-name: /run/topolvm/lvmd.sock
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device-classes:
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- name: ssd
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volume-group: ssd-vg
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spare-gb: 0 <1>
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default: true
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- name: hdd
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volume-group: hdd-vg
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spare-gb: 0
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- name: thin
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spare-gb: 0
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thin-pool:
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name: thin
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overprovision-ratio: 10
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type: thin
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volume-group: ssd
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- name: striped
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volume-group: multi-pv-vg
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spare-gb: 0
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stripe: 2
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stripe-size: "64"
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lvcreate-options:<2>
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----
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<1> When you set the spare capacity to anything other than `0`, more space can be allocated than expected.
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<2> Extra arguments to pass to the `lvcreate` command, such as `--type=<type>`. Neither {product-title} nor the LVMS verifies `lvcreate-options` values. These optional values are passed as is to the `lvcreate` command. Ensure that the options specified here are correct.
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