Difference between revisions of "Tier1 Operations Report 2017-04-05"

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* Atlas Pilot (Analysis) 1500
 
* Atlas Pilot (Analysis) 1500
 
* CMS Multicore 460
 
* CMS Multicore 460
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* LHCb 1000
 
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Revision as of 09:23, 5 April 2017

RAL Tier1 Operations Report for 5th April2017

Review of Issues during the week 29th March to 5th April 2017.
  • LHCb Castor instance has been running with problems all this last week. Initially it appeared the new SRM version was causing a bottleneck. This was fixed but it then appears the stager was also struggling. Work has been ongoing to resolve this.
  • Some batch job submission errors have been seen by CMS and LHCb. These are not yet understood. ?? Ongoing
  • Over the weekend there were problems with the Atlas Frontier systems. Lyon were also affected.
  • On Monday problems were reported on one of the ARC CEs (AC-CE4) and its services were restarted.
Resolved Disk Server Issues
  • GDSS780 (LHCbDst - D1T0) had failed on Sunday (26th) and was put back in service the following day. However, it crashed again on the 29th March. Following that its disks were swapped into new chassis and that was brought into service (as GDSS780) on Monday 3rd April.
  • GDSS733 (LHCbDst - D1T0) was taken out of service on Thursday 30th March. The server seemed to be behaving badly in Castor and was taken out of production and checked over by Fabric Team although nothing was found. It was returned to service the following afternoon.
Current operational status and issues
  • We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities but the level of failures is reduced as compared to a few weeks ago.
Ongoing Disk Server Issues
  • gdss673 (LHCb-Tape) was removed from production this morning (05/04/2017) due to it having a double disk failure.
Limits on concurrent batch system jobs.
  • Atlas Pilot (Analysis) 1500
  • CMS Multicore 460
  • LHCb 1000
Notable Changes made since the last meeting.
  • Six 2014 batch of disk servers have been installed in CMSDisk.
  • Perfsonar nodes are now working over IPv6 on the production Tier1 network.
  • The second chiller to be replaced was craned out on last Thursday and the replacement put in its place.
  • Out of Hours cover for the CEPH ECHO service is being piloted.
Declared in the GOC DB
  • None
Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.

Pending - but not yet formally announced:

  • Update Castor SRMs - CMS & GEN still to do. This is awaiting a full understanding of the problem seen with LHCb.
  • Chiller replacement - work ongoing.
  • Merge AtlasScratchDisk into larger Atlas disk pool.

Listing by category:

  • Castor:
    • Update SRMs to new version, including updating to SL6.
    • Bring some newer disk servers ('14 generation) into service, replacing some older ('12 generation) servers.
  • Networking
    • Enable first services on production network with IPv6 once addressing scheme agreed.
  • Infrastructure:
    • Two of the chillers supplying the air-conditioning for the R89 machine room are being replaced.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
srm-lhcb.gridpp.rl.ac.uk, UNSCHEDULED OUTAGE 31/03/2017 16:00 01/04/2017 10:43 18 hours and 43 minutes There are problems with the LHCb Castor instance.
srm-atlas.gridpp.rl.ac.uk UNSCHEDULED WARNING 29/03/2017 09:00 29/03/2017 14:12 5 hours and 12 minutes upgrading Atlas srm software to 2.1.16
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
127388 Green Less urgent In Progress 2017-03-29 2017-04-03 LHCb [FATAL] Connection error for some file
127240 Green Urgent In Progress 2017-03-21 2017-03-27 CMS Staging Test at UK_RAL for Run2
126905 Green Less Urgent Waiting Reply 2017-03-02 2017-04-03 solid finish commissioning cvmfs server for solidexperiment.org
126184 Amber Less Urgent In Progress 2017-01-26 2017-02-07 Atlas Request of inputs for new sites monitoring
124876 Red Less Urgent On Hold 2016-11-07 2017-01-01 OPS [Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
117683 Red Less Urgent On Hold 2015-11-18 2017-03-02 CASTOR at RAL not publishing GLUE 2.
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 845); Atlas HC ECHO = Atlas ECHO (Template 841);CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC Atlas HC ECHO CMS HC Comment
29/03/17 100 100 100 97 83 100 99 100 SRM test failures
30/03/17 100 100 100 100 88 100 100 100 SRM test failures
31/03/17 100 100 100 98 50 96 100 100 SRM test failures
01/04/17 100 100 67 100 79 100 100 100 Atlas: Missing data; LHCb: SRM test failures
02/034/17 100 100 100 98 100 100 89 100 SRM test failures
03/04/17 100 100 100 97 82 98 94 99 SRM test failures
04/04/17 100 100 100 100 100 100 100 100
Notes from Meeting.
  • None yet