# Identify snapshots created with Data Lifecycle Manager pre and post scripts
<a name="dlm-script-tags"></a>

Amazon Data Lifecycle Manager automatically assigns the following system tags to snapshots created with pre and post scripts.
+ Key: `aws:dlm:pre-script`; Value: `SUCCESS`\$1`FAILED`

  A tag value of `SUCCESS` indicates that the pre script executed successfully. A tag value of `FAILED` indicates that the pre script did not execute successfully. 
+ Key: `aws:dlm:post-script`; Value: `SUCCESS`\$1`FAILED`

  A tag value of `SUCCESS` indicates that the post script executed successfully. A tag value of `FAILED` indicates that the post script did not execute successfully. 

For custom SSM documents and SAP HANA backups, you can infer successful application-consistent snapshot creation if the snapshot is tagged with both `aws:dlm:pre-script:SUCCESS` and `aws:dlm:post-script:SUCCESS`.

Additionally, application-consistent snapshots created using VSS backup are automatically tagged with:
+ Key: `AppConsistent tag`; Value: `true`\$1`false`

  A tag value of `true` indicates that the VSS backup succeeded and that the snapshots are application-consistent. A tag value of `false` indicates that the VSS backup did not succeed and that the snapshots are not application-consistent.