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	Added section relating to clearing data from Blaze (#303)
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							@@ -340,6 +340,24 @@ The storage space on your hard drive will depend on the number of FHIR resources
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For more information on Blaze performance, please refer to [import performance](https://github.com/samply/blaze/blob/master/docs/performance/import.md).
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### Clearing data
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The Bridgehead's FHIR store, Blaze, saves its data in a Docker volume. This means that the data will persist even if you stop the Bridgehead. You can clear existing data from the FHIR store by deleting the relevant Docker volume.
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First, stop the Bridgehead:
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```shell
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sudo systemctl stop bridgehead@<PROJECT>.service
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```
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Now remove the volume:
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```shell
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docker volume rm <PROJECT>_blaze-data
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```
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Finally, restart the Bridgehead:
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```shell
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sudo systemctl start bridgehead@<PROJECT>.service
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```
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You will need to do this for example if you are using a VM as a test environment and you subsequently want to use the same VM for production.
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#### ETL for BBMRI and GBA
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Normally, you will need to build your own ETL to feed the Bridgehead. However, there is one case where a short cut might be available:
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