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ATLAS UK Cloud Support meeting minutes, 14 March 2019
Present: Brian Davies, Dan Traynor, Elena KorolkovA, Matt Doidge,Sam Skipsey, Vip Davda
Outstanding tickets:
139741
* ggus 139741 UKI-SCOTGRID-GLASGOW: No such file or directory
opened by a per on in RRC-KI-T1 and concern only about transfers to RRC-KI-T1. Files are available in Glasgow. Glasgow is currently in a down time. The ticket can be closed
* ggus 139741 UK UKI-NORTHGRID-LANCS-HEP: transfer and staging error with”DESTINATION OVERWRITE srm-ifce err”
Matt is working on it
* ggus 139741 UKI-NORTHGRID-LANCS-HEP deletion errors due to credential issue
the problem is still there. Matt doesn't understand it
* ggus 139723 RAL-LCG2 permissions on scratchdisk
Development to get rucio mover working with RAL Echo
hasn't been updated for 2 weeks
* ggus 138033 RAL-LCG2 singularity jobs failing at RAL
hasn't been updated since 31/01
* ggus 140134 UKI-SOUTHGRID-OX-HEP:Unspecified gridmanager error: Code 0 Subcode 0
Oxford is killing jobs exceeding max memory.
Atlas asked sites not to kill jobs over memory usage. Pilots should deal with it.
Will wait for reply from Ivan, who is in charge of production.
Ongoing issues (last comments marked in green):
1. LocalGroupDisk consolidation (Tim)
* most >2year old datasets removed 4 July. Should free 488 TB. Tim will check the rest.
* Tim: R2D2 has default lifetime of 180 days (can be changed when making request).
At S&C Week, Cedric suggested a "subscribe to dataset" option to get email notifications. I think it would be more useful to do this when creating rule, and notification when LOCALGROUPDISK is last replica.
* Brian: do we really need to keep 10% free space? This prevents disk filling up, and leaves room for unexpected increases. Not necessary for sites to also provide a safety margin.
* Tim has asked Roger if we should rebalance more T2 disk from LOCALGROUPDISK to DATADISK. Will prod again.
10/01: Cleanup run is due sooner rather than later. RHUL increased space recently.
17/01: Is 180 day still the limit? We had mixed results when trying in the meeting.
Kashif: How to tell users of files on site's LOCALGROUPDISK? Currently using dmlite-shell.
24/01: Tim sent instructions last week to the atlas-support-cloud-uk list for checking Rucio (don't need to be an ATLAS user).
Kashif: many users have left Oxford, so difficult to contact. Will contact ATLAS Oxford group leader.
Dan asked about user quotas on LOCALGROUPDISK. Some users seem to have individual quotas. They shouldn't.
2. Harvester issues (Peter/Alessandra/Elena)
06/12: Nicolo, Ivan, and Fernando declared the migration of UK T2 UCORE queues complete, but problems still at Manchester (at least). So we keep an ongoing issue.
Manchester UCORE half empty for almost a week. ce01 empty, ce02 OK.
Peter is looking at improving monitoring. Harvester obfuscates differences between CEs, whereas APF treated them differently.
http://apfmon.lancs.ac.uk/CERN_central_B:UKI-NORTHGRID-MAN-HEP_SL7_UCORE-ce01
http://apfmon.lancs.ac.uk/CERN_central_B:UKI-NORTHGRID-MAN-HEP_SL7_UCORE-ce02
Alessandra can't find Harvester "factory" for GPU queue.
Peter asked Fernando to improve messages from Harvester. Peter will continue looking into it with monitoring.
13/12: Elena has setup panda site UKI-LT2-QMUL_SL7_UCORE and queue UKI-LT2-QMUL_SL7_UCORE and sent email to harvester experts asking to include it to Harvester.
10/01: Gareth asked about approach to debugging issues at Durham. Elena will follow-up Harvester status at Durham and get an update on procedures. Peter to check apfmon in relation to Harvester. QMUL_UCORE is running OK under Harvester.
17/01: Elena: Ivan set Durham UCORE PQ offline in September (currently just score). Elena mailed him twice. Will set back online.
Brian confirmed that he has declared missing files lost. Procedure with new DDM emails seems to work fine.
24/01: Elena confirmed that Durham not in Harvester yet. Will be migrated separately because it uses aCT.
Elena: Removed secondary Squids from UK T2s in AGIS. Three sites don't have local squids: IC uses QMUL, Durham uses Glasgow, Sussex uses RALPP. These should be left as-is.
Elena: Raoul from Brunel asked about moving away from SRM. Should be possible to use gsiftp instead. Elena will check in AGIS.
31/01: Elena: problem with Durham solved. When they move to CentOS7 they will be moved to Harvester and UCORE.
Brunel asked about doing transfers without SRM. Configured same as Lancaster, which is using xrootd-only. Peter will check Brunel's settings (Elena will forward him the email).
Alessandra set QMUL CentOS7 queue to test mode, because it doesn't yet have enough slots.
28/02: Migration almost complete. Kept SL6 queues on APF because they'd go away.
Remaining APF factories listed here: http://apfmon.lancs.ac.uk/aipanda157 .
In the end should only have analysis queues on APF.
Also think about moving test queues. Should have a separate Harvester instance to allow testing.
14/3
Lancs
Peter configured Lancs in AGIS to use GridFTP
Brunel
Elena made changes in AGIS and now Brunel is set online. Will look how Lancaster is doing with setup for GridFTP and try to add GridFTP to Brunel and disable srm.
QMUL
Elena removed a queue for ES. QMUL is OK now. Elena will contact harvester expert how to use a high memory quueues
3. Bham XCache
14/3 Following discussion at Jamboree Mark agreed to install XCache ib Bham. Mark asked for support and Ilija and Rod will help him to install XCache. Mark can deploy it by himself ( install on bare metal or using singularity / docker container) or deploy kubernetes cluster with SLATE and I do the rest, keep it up and running, updated, monitored, set up in AGIS.
Sam suggested to discuss Bham XCache setup at the Storage meeting next week. Elena will send email to Mark
4. CentOS7 migration (Alessandra)
UK quite advanced. Sites with PBS will have to switch to something else.
Alessandra will follow progress for UK (also coordinating for the rest of ATLAS).
31/01: RALPP is moving to CentOS7-only. Elena will check queues.
14/02: Elena switched RALPP UCORE PanDA queue from SL6 to CentOS7. Analysis C7 queue still has problems.
Kashif: Oxford has 2/3 of worker nodes moved to C7 queue. Can delete SL6 queues in a few weeks' time.
Vip: Jeremy has a web page with progress, https://www.gridpp.ac.uk/wiki/Batch_system_status . We should keep that up to date, but also need to monitor progress for ATLAS migration.
28/02: At Vip's request, during the meeting Elena disabled UKI-SOUTHGRID-OX-HEP_CLOUD, UKI-SOUTHGRID-OX-HEP_UCORE, ANALY_OX_TEST, and UKI-SOUTHGRID-OX-HEP_TEST. Just have CentOS7 queues, UKI-SOUTHGRID-OX-HEP_SL7_UCORE and ANALY_OX_SL7.
5. Diskless sites
21/02: Sheffield will have to reduce to 150TB, but has 800 job slots. This is a good candidate for going diskless (no buffer to start with), accessing data from Lancaster and/or Manchester.
Birmingham should have 600 TB (700-800TB next year). We can use this! It is large enough for a DATADISK.
Agreed to discuss with ATLAS at the Sites Jamboree (5-8 March). We can then bring it back to GridPP.
28/02: Brian: We need more experience from Birmingham and Manchester monitoring.
14/03 From Jamboree:
Bham
Mark has agreed to setup XCache in Bham
Shef
When Mark switches to XCache Sheffield can use Manchester storage
Cam and Sussex
Dan is happy for Cam and Sussex to use QM storage
Brunel
Dan is not sure about Brunel. Elena will ask Raul
LOCALGROUPDISK at diskless sites
Elena will send email to ATLAS
6. Dumps of atlas namespace
Brian noticed that some sites stopped provide dumps of atlas namespace. Scripts stopped working after DPM upgrade and contacted sites. Brian will open JIRA ticket.
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