GridPP Technical Meeting - DOME

Europe/London
Virtual Only

Virtual Only

Alastair Dewhurst (Science and Technology Facilities Council STFC (GB)), Andrew McNab (University of Manchester), David Colling (Imperial College Sci., Tech. & Med. (GB))
Description

Weekly meeting slot for technical topics. We will try and focus on one topic per meeting.  We will announce at the Tuesday Ops meeting if this meeting is going ahead and if so the topic to be discussed.

An introduction was given by Sam Skispey:
DOME is the brain child of Fabrizio Furano during his turn in charge of DPM.  DPM Code base is frequently considered hard to maintain because it is written by a single developer who then hands it over to someone else.  DOME is a fairly radical change under the hood:
- It changes a lot of the process running with an XRootD system with plugins.
- It does not change the database.  
- DOME doesn’t understand the SRM.  
- It is possible to run DOME + legacy services to enable the SRM to still run, however we want to move to pure DOME sites.
 
Clarifications from Matt's talk:
After September, there will be no support (including security) for legacy DPM.  You will need to be running pure DOME.  The timing of site upgrades is being coordinated in the storage meeting and won't be repeated here.
 
Enabling gridftp_redirect => true is critically important.  Otherwise all gridftp transfers go through your headnode! 
 
Tim gave very clear instructions on how to get ATLAS to stop using the SRM.
 
Actions:
Sam Skipsey to create tools that work in DOME that will assist a site admin in the event that a disk server is lost.
 
Alastair Dewhurst to send out an email and ask sites which VOs they support. We can then compile a list of instructions on how we get each VO to stop using the SRM.  (Wiki page created at: https://www.gridpp.ac.uk/wiki/Retiring_SRM)
There are minutes attached to this event. Show them.
    • 11:00 11:15
      Overview of DOME 15m
      Speaker: Samuel Cadellin Skipsey
    • 11:15 11:30
      Upgrading to DOME - Site experience 15m
      Speaker: Matthew Doidge (Lancaster University)
    • 11:30 11:45
      Retiring SRM - ATLAS perspective 15m
      Speaker: Dr Tim Adye (Science and Technology Facilities Council STFC (GB))
    • 11:45 12:00
      AoB 15m