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# Praefect Rake Tasks **(CORE ONLY)**
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> [Introduced]( https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28369) in GitLab 12.10.
## Replica checksums
Prints out checksums of the repository of a given project_id on the primary as well as secondary internal Gitaly nodes.
NOTE: **Note:**
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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.
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**Omnibus Installation**
```shell
sudo gitlab-rake "gitlab:praefect:replicas[project_id]"
```
**Source Installation**
```shell
sudo -u git -H bundle exec rake "gitlab:praefect:replicas[project_id]" RAILS_ENV=production
```
