# How to search for datasets in DAS and McM
### How to find a request, given a prep-ID
(example here: TOP-RunIIFall18-00005)
[https://cms-pdmv.cern.ch/mcm/requests?prepid=TOP-RunIIFall18GS-00005\&page=0\&shown=127](https://cms-pdmv.cern.ch/mcm/requests?prepid=TOP-RunIIFall18GS-00005\&page=0\&shown=2147483775)
or go to [https://cms-pdmv.cern.ch/mcm](https://cms-pdmv.cern.ch/mcm) , and click "Request" in the top, and click the "Navigation", and in the prepid field, paste the given prepID, and click "Search"
### How to find a request, given the dataset name
(example here: /ST\_t-channel\_tauDecays\_13TeV-comphep-pythia8\_TuneCP5/RunIIFall18GS-102X\_upgrade2018\_realistic\_v11-v1/GEN-SIM)
or go to [https://cms-pdmv.cern.ch/mcm](https://cms-pdmv.cern.ch/mcm) , and click "Request" in the top, and click the "Output dataset", and paste the dataset name, and click "Search"
### Sample overview in DAS
All completed samples will be available in DAS\
• Analysts can find various type of data samples and can transfer files to laptop/Tier-2/3\
• General queries about DAS, command line tool, etc. are available at DAS-FAQs\
• Find datasets in DAS:
• Currently no direct link between DAS and McM. So find McM prep-ID in DAS and use in McM
* Status VALID: production is finished and dataset is available
* Status PRODUCTION: Its statistics is still growing due to running production jobs
and dataset is not yet announced. But analysts can still run over the existing statistics by using crab parameter "allowNonValidInputDataset" parameter inCRAB3 configuration parameters
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://cms-pdmv.gitbook.io/project/analyzers-corner/how-to-search-for-datasets-in-mcm.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.