This is the CERN CDR FAQ. It attempts to answer the most frequently asked questions about the CERN Central Data Recording Service. If your question is not answered in this FAQ, please send your question to cdr.support@cern.ch. This FAQ is available in printable pdf and postscript formats

Table of contents

1. Introduction
   1. What is the Central Data Recording (CDR) ?
   2. Who is responsible for the CDR service ?
   3. What is the policy concerning usage of the CDR ?
   4. Who contributed to the development of the CDR
2. General questions
   1. How much will it cost to use the CDR service
   2. What are the system requirements for using the CDR ?
   3. Who do I contact for help or support ?
   4. Do I need afs for the CDR ?
   5. What account does the CDR run under ?
   6. Does the CDR run over the winter shutdown period ?
   7. What should be done at the end of a run ?
   8. What resources does the CDR consume ?
   9. Can the CDR be used with Objectivity and ROOT ?
3. Getting started
   1. How do I start using the CDR ?
   2. What architectures are supported ?
   3. My DAQ does not run a CDR supported OS.
   4. How do I control the CDR ?
      
4. Data access and storage - CASTOR
   1. Where does the CDR store my data
   2. How do I see my CDR files in CASTOR
   3. How do I access data recorded to obsolete tapes via CDR
   4. How do I access data recorded to CASTOR via CDR
   5. Data files on the DAQ are
   6. How do I know if my data in CASTOR have been migrated to tape ?
   7. Data in CASTOR are not the same as the data on the DAQ disks
5. Troubleshooting
   1. DAQ filesystems are 100% full
   2. I get error mail messages from Cron under the CDR account
   3. There is a problem with the CDR service request form
   4. CDR fails to transfer some files (I/O error)
   5. How do I know if the CDR is running on my DAQ