Usage of CMS PhEDEx

This segment introduces how to create subscriptions for downloading datasets, deleting datasets and monitoring the process of downloading.

create subscriptions for downloading datasets

If you want to download datasets from other sites such FNAL, IN2P3, please check if the dataset is in the PhEDEx and DBS and get the dataset name.

    https://cmsdoc.cern.ch:8443/cms/aprom/phedex/prod/Data::Replicas(PhEDEx)
    http://cmsdbs.cern.ch/DBS2_discovery/(DBS)

The second step, go to the request page in PhEDEx, fill the table with the dataset name and submit:

    https://cmsdoc.cern.ch:8443/cms/aprom/phedex/prod/Request::Create?type=xfer

The third step, go to the view requests page to check if the requests is correct:

    https://cmsdoc.cern.ch:8443/cms/aprom/phedex/prod/Request::View 

monitor the process of downloading

• You can check if your dataset is complete by checking the subscription page: http://cmsdoc.cern.ch/cms/aprom/phedex/prod/Data::Subscriptions?col=ITEM_LEVEL&col=ITEM_NAME&col=NODE_NAME&col=PRIORITY&col=PCT_BYTES&col=IS_MOVE&col=TIME_SUSPEND_UNTIL&col=TIME_CREATE&col=TIME_CLEAR&node=22&filter=.*&priority=any&suspended=any&view=global
• Also you can go into the phedex web page "Data"->"Replicas"(http://cmsdoc.cern.ch/cms/aprom/phedex/prod/Data::Replicas)

1. push the button "show options", and choose "T2_CN_Beijing" in "Node shown", choose " % Complete (files)" in "Node values"
2. fill your dataset name in the blank before the button "filter", then push the "filter" button to search
3. when you got the dataset you need, push the button "<<", you will get the blocks and files inside the dataset and their status in T2_CN_Beijing.

create subscriptions for deleting datasets

You can not delete your dataset downloaded by PhEDEx directly because they are also registered in the PhEDEX and DBS. Therefore, If you delete them from SE directly, PhEDEx and DBS would think the site still has them. The correct deletion methods would be:

   1.go to the delete request page: https://cmsdoc.cern.ch:8443/cms/aprom/phedex/prod/Request::Create?type=delete
   2.fill the dataset name and select T2_CN_Beijing in the table
   3.submit

How to get the directory of the dataset in SE or the LFN name of the dataset by the dataset subscription name(eg. /Zee/CSA08_CSA08_S156_v1/GEN-SIM-RECO)

The LFN name is used to know the directory of the dataset in SE. The directory format of your dataset in SE is: srm://srm.ihep.ac.cn:8443/pnfs/ihep.ac.cn/data/cms/. There are two ways to do that. one is to use phedex, the other is to use DBS.
the following is the way of phedex:

1. go to the phedex web page "Data"->"Replicas";
http://cmsdoc.cern.ch/cms/aprom/phedex/prod/Data::Replicas
2. push the button "show options", and choose "T2_CN_Beijing" in "Node shown"
3. fill your dataset subscription name in the blank before the button "filter", then push the "filter" button to search
4. when you got the dataset you need, push the button "<<", you will get the LFN of files inside the dataset 

the following is the way of DBS:

1. go to DBS web page:https://cmsweb.cern.ch/dbs_discovery/
2. use "the advanced key word search", and put the dataset subscriptiion name in.
3.you will get the result page, then enter "plain" page. You get the LFN name of the dataset.

Please feel free to give some comments.