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# Praefect Rake tasks **(CORE ONLY)**
> [Introduced]( https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28369) in GitLab 12.10.
Rake tasks are available for projects that have been created on Praefect storage. See the
[Praefect documentation](../gitaly/praefect.md) for information on configuring Praefect.
## Replica checksums
Prints out checksums of the repository of a given project_id on the primary as well as secondary internal Gitaly nodes.
`gitlab:praefect:replicas` prints out checksums of the repository of a given `project_id` on:
NOTE: **Note:**
This only is relevant and works for projects that have been created on a Praefect storage. See the [Praefect Documentation](../gitaly/praefect.md) for configuring Praefect.
| [Repository storage](../administration/raketasks/storage.md) | List and migrate existing projects and attachments from legacy storage to hashed storage. |