Tier1 Operations Report 2020-01-15

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RAL Tier1 Operations Report for 15th January 2020

Review of Issues during the week 8th January 2020 to the 14th January 2020.

Current operational status and issues
Notable Changes made since the last meeting.
  • NTR
Entries in GOC DB starting since the last report.
Service ID Scheduled? Outage/At Risk Start End Duration Reason
Declared in the GOC DB

Castor nameserver upgrade 22-01-20 https://goc.egi.eu/portal/index.php?Page_Type=Downtime&id=28258

  • No ongoing downtime
Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.

Listing by category:

Open GGUS Tickets
Ticket-ID Type VO Site Priority Responsible Unit Status Last Update Subject Scope
144549 USER mice RAL-LCG2 less urgent NGI_UK in progress 2020-01-13 14:51:00 Additional MICE Miscellaneous data for Castor EGI
144457 TEAM lhcb RAL-LCG2 very urgent NGI_UK on hold 2020-01-10 08:58:00 Failing transfer to RAL-BUFFER WLCG
144431 USER cms RAL-LCG2 urgent NGI_UK in progress 2020-01-13 09:34:00 Transfers failing to RAL_Disk WLCG
143669 USER snoplus.snolab.ca RAL-LCG2 urgent NGI_UK on hold 2019-11-18 09:13:00 SNO+ LFC to DFC migration EGI
143323 TEAM lhcb RAL-LCG2 top priority NGI_UK on hold 2019-12-20 12:40:00 File deletion at RAL ECHO WLCG
142350 TEAM lhcb RAL-LCG2 top priority NGI_UK on hold 2019-12-12 14:50:00 Proble accessing some LHCb files at RAL WLCG

GGUS Tickets Closed Last week

Ticket-ID Type VO Site Priority Responsible Unit Status Last Update Subject Scope
144705 USER ops RAL-LCG2 less urgent NGI_UK verified 2020-01-14 11:09:00 [Dashboard] Issues detected at RAL-LCG2 EGI
144683 USER cms RAL-LCG2 urgent NGI_UK solved 2020-01-08 15:40:00 Mistake in Siteconf Fallback SE name WLCG

Availability Report

Day Atlas CMS LHCB Alice Comments
2020-01-08 100 100 100 100
2020-01-09 100 100 100 100
2020-01-10 100 100 100 100
2020-01-11 100 100 100 100
2020-01-12 100 100 100 100
2020-01-13 100 100 100 100
2020-01-14 100 100 100 100
Hammercloud Test Report
Target Availability for each site is 97.0%
Day Atlas HC CMS HC Comment
2020-01-01 100 98
2020-01-02 100 99
2020-01-03 100 98
2020-01-04 100 98
2020-01-05 100 97
2020-01-06 100 98
2020-01-07 100 98

Key: Atlas HC = Atlas HammerCloud (Queue RAL-LCG2_UCORE, Template 841); CMS HC = CMS HammerCloud

Notes from Meeting.

Teir-1 Liaison 20/11/2019

Attendee's RobA Marcello, Jose, Darren, Brian, Raja, Alistair

QUESTION Raja, when was the xrootd reboots done - during the last liaison meeting. There was an elog entry.

ACTION DM : GGUS#144015, orig issue resolved. Create new RT ticket regards optimising processing. Close the orig ticket.

ACTION DM : GGUS#143762. Possible to tailor the queues per VO, however the risk outweighs the gain. We might break something we haven't anticipated i.e. accounting. This ticket to be closed as we aren't going to "resolve". SL6 to be supported up until end of Nov 2020.

ACTION AD : GGUS#143669 not progress

ACTION Raja : GGUS#143323 : Add some statistics to tickets showing improvement (or not!)

GGUS#142350 : Double read issue, no apparent improvement. GGUS#143645 (solved), however ticket listed 3 possible solutions, the working solution(s), has not been identified.

QUESTION Raja, why are some WN's more susceptible that other, no one seems to have an answer. Possibly more jobs running on the node, the more likely something will fail. Failure rate can be as much as 20%.

DIRAC used because of late binding functionality, this seems the be kicking LHCb.

ACTION Raja Further investigation required to differentiate between user and production jobs.

ACTION Marcello to ensure the caches are working on the gateways.

DUNE ran test jobs at RAL, loaded 1500 jobs, we got 10. However, there are not enough DUNE jobs to go around! RAL is processing them correctly.

ACTION Raja : How does DUNE allocate jobs to sites

Attendee's Brian, Alastair, Darren, Katy, GeorgeP, Jose, TomB, Raja, TimA Tier-1 Liaison 11/12/2019

Raja, Tom. Raja waiting for Echo upgrade - Mimic - LHCb think this is a silver bullet. Issues this week, planned test (as per liaison report, AoD.

LFC should be Frontier Err in report

Ref last SN failer, next year

ACTION Tom to look at disabling swap on ALL SN's in new year (2020).

GeorgeP starting to delete Alice file decommissioning.

20 disc servers in racks need to be moved – pre-production, 1off Alice in this rack.

Delete files on that server first hen decommission

Clearing of namespace to complete next week.

Fabric running late on decommissioning so will leave server to clear. will not impact rack decommissioning.

AD to update snoplus ticket

VO issues, decommissioning Frontier.

Disabled Atlas side Monday, few jobs caught out because of old config or running for long length of time.

Will wait ~another day, let jobs finish then stop service

Extra squid added to list, request should be submitted soon or won’t get done this year/decade

Tier-1 Liaison 08/01/2020

Attendee's: Alistair, Brian, Katy, Darren and Raja

- CMS has experienced major job failures since ~2300 yesterday (07/01/2020). Impacting a number of T1's.

- 144683 - CMS need to confirm this ticket can be closed. - 144549 - George changed the permissions to allow them to write. Amount to write is trivial, really need to define what "trivial" means in this case! - 144457 - Ton to further investigate the performance, ACTION: Raja to conform LHCb are not still seeing this issue. - 144431 - Has been fixed, only still open as a placeholder because Katy wanted to confirm forced-overwrite issue i.e. why and what RAL does. - 143663 - Still with Alistair - 143323 /142350 - ACTION Raja - Confirm status with TomB. Possibly waiting Mimic upgrade.

Tier-1 Liaison 15/01/2020

Attendee's: Brian, Katy, Darren, Henry, Rob, and Raja

- Possibility that CMS might not be using multi-core jobs efficiently/correctly. - Henry (MICE) has written the last data to MICE Archive. He will confirm this is all present and correct in the following week. - Henry questioned using XRD. However was informed that CASTOR users should use SRM as tape end-point. - 144549: Henry to confirm write complete next week. - 144457: Christophe to check and then close. - 144431: Placeholder ticket for Katy. - 143669: Action with Alistair. - 143323/142350: Still on-hold awaiting Echo Mimic - Tim RT’s tickets – no new ones, no progress on current ones