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## `USING_EPHEMERAL_DISKS`

Option | `USING_EPHEMERAL_DISKS`
Description | Whether to use ephemeral disks on all nodes
Default | `false`
Values | `true` | Use ephemeral disks
| `false` | Don't use ephemeral disks

The `USING_EPHEMERAL_DISKS` option should be set to `true` for nodes that have bucket storage.

When set to `true`, data is deleted from Kafka once the data reaches the bucket storage. Otherwise, if `false`, the data is deleted from Kafka once the data is on a sufficient number of local disk replicas.

While it is not recommended for this variable to be set to `false` on a long term basis, it is convenient to run with `USING_EPHEMERAL_DISKS=false` while migrating to bucket storage. This enables you to validate that the bucket storage system performs well, but once the bucket storage has been validated, the variable should be set to `true`.

### Important

The `USING_EPHEMERAL_DISKS` option should either be set on all nodes in a cluster, or on none of them.

ini

    USING_EPHEMERAL_DISKS=true

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