public:lta_faq

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public:lta_faq [2021-03-08 09:16] – Replaced Groningen with Poznan as LTA site Hanno Holtiespublic:lta_faq [2023-02-17 10:48] (current) – Hanno Holties
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 === What is an appropriate amount of data to retrieve? === === What is an appropriate amount of data to retrieve? ===
  
-This depends. As a rule of thumb, we ask you to keep your requests below 5 TB in volume and smaller than 1'000 files. Also, the total file count in all your //running// requests should not exceed 5'000 files at any point in time.+This depends. As a rule of thumb, we ask you to keep your requests below 5 TB in volume and smaller than 1'000 files. Also, the total file count in all your //running//  requests should not exceed 5'000 files at any point in time.
  
 In more detail, there are essentially two things to consider: The capabilities of your own system and the capabilities of the LTA services. In more detail, there are essentially two things to consider: The capabilities of your own system and the capabilities of the LTA services.
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   * If you are asking about a command that failed, please copy-paste the exact command that you executed together with the full terminal output. (Some tools (like the srm commands) have a '-debug' option, which provides additional information, e.g. about your environment. It helps a lot if you could use that option when you copy-paste your command output.)   * If you are asking about a command that failed, please copy-paste the exact command that you executed together with the full terminal output. (Some tools (like the srm commands) have a '-debug' option, which provides additional information, e.g. about your environment. It helps a lot if you could use that option when you copy-paste your command output.)
   * If you are using some script somebody gave you, please note that we are no clairvoyants and have no idea what the script you're using actually does. We can very likely not understand what went wrong from the output of some random script. Please check the [[:public:lta_howto|]], whether the officially supported ways of data retrieval work for you. If they work, please ask the one who supplied you with the failing script, why his or her script fails. If the official ways don't work, please forget about your script for a moment and provide the output of the official tool that does not work for you.   * If you are using some script somebody gave you, please note that we are no clairvoyants and have no idea what the script you're using actually does. We can very likely not understand what went wrong from the output of some random script. Please check the [[:public:lta_howto|]], whether the officially supported ways of data retrieval work for you. If they work, please ask the one who supplied you with the failing script, why his or her script fails. If the official ways don't work, please forget about your script for a moment and provide the output of the official tool that does not work for you.
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 ==== Troubleshoot ==== ==== Troubleshoot ====
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 === I did not receive a mail notification that my data is ready for retrieval! Has my request gone lost? === === I did not receive a mail notification that my data is ready for retrieval! Has my request gone lost? ===
  
-After you got a notification that your requests was scheduled, it is in our database and there's hardly a possibility that it got lost. Staging requests can take up to a day or two, but will finish a lot sooner in most cases. This depends on your request's size but also on how busy the storage systems are by other user's requests at the moment. Sometimes, the LTA storage systems are down for maintenance and this can delay the whole procedure. You can [[http://web.grid.sara.nl/cgi-bin/lofar.py|check for downtimes here]].+After you got a notification that your requests was scheduled, it is in our database and there's hardly a possibility that it got lost. Staging requests can take up to a day or two, but will finish a lot sooner in most cases. This depends on your request's size but also on how busy the storage systems are by other user's requests at the moment. Sometimes, the LTA storage systems are down for maintenance and this can delay the whole procedure. You can [[https://ganglia.grid.surfsara.nl/cgi-bin/lofar.py|check for downtimes here]].
  
 It is not alarming when your request did not finish in 24 hours, even when your last request finished within 10 minutes. In urgent cases or if you did not receive a notification after 48 hours, please contact the [[https://support.astron.nl/rohelpdesk|ASTRON helpdesk]]. It is not alarming when your request did not finish in 24 hours, even when your last request finished within 10 minutes. In urgent cases or if you did not receive a notification after 48 hours, please contact the [[https://support.astron.nl/rohelpdesk|ASTRON helpdesk]].
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 === My downloads don't start / time out === === My downloads don't start / time out ===
  
-Maybe the SRM system is down for maintenance, please check [[http://web.grid.sara.nl/cgi-bin/lofar.py|http://web.grid.sara.nl/cgi-bin/lofar.py]]. If there is nothing going on, there is probably something wrong with the download service. Please try again a bit later and submit a support request to the [[https://support.astron.nl/rohelpdesk|ASTRON helpdesk]], if the issue persists.+Maybe the SRM system is down for maintenance, please check [[https://ganglia.grid.surfsara.nl/cgi-bin/lofar.py|https://ganglia.grid.surfsara.nl/cgi-bin/lofar.py]]. If there is nothing going on, there is probably something wrong with the download service. Please try again a bit later and submit a support request to the [[https://support.astron.nl/rohelpdesk|ASTRON helpdesk]], if the issue persists.
  
 === Http downloads randomly fail with "503 Service Temporarily Unavailable" === === Http downloads randomly fail with "503 Service Temporarily Unavailable" ===
  • Last modified: 2021-03-08 09:16
  • by Hanno Holties