Tier1 Operations Report 2016-07-06

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RAL Tier1 Operations Report for 6th July 2016

Review of Issues during the week 29th June to 6th July 2016.
  • During this last week we have been able to run the tape library control software in a stable configuration with not all the Tier1 tape drives in use. We have also been able to provoke a crash by adding in the remaining tape drives. In the last day we have reduced the rate of some of the monitoring checking tasks. This includes a validation that Castor is in step with the tape drives. Initial results suggest this enables us to stably run the full system, with all tape drives in use,
  • There has been saturation of the inbound 10Gbit OPN link over the last 36 hours, and outbound data rates have been very high too.
Resolved Disk Server Issues
  • None.
Current operational status and issues
  • There is a problem seen by LHCb of a low but persistent rate of failure when copying the results of batch jobs to Castor. There is also a further problem that sometimes occurs when these (failed) writes are attempted to storage at other sites. A recent modification has improved, but not completed fixed this.
  • The intermittent, low-level, load-related packet loss seen over external connections is still being tracked. Likewise we have been working to understand some remaining low level of packet loss seen within a part of our Tier1 network.
Ongoing Disk Server Issues
  • GDSS654 (LHCbRawRdst - D0T1) crashed on Sunday morning, 3rd July. There were eleven files awaiting writing to tape on the server. Three of these were found to be corrupt and were declared lost to LHCb.
  • GDSS730 (CMSDisk - D1T0) reported a read-only filesystem this morning. It has been taken out of services while this is investigated.
Notable Changes made since the last meeting.
  • Updated dteam VOMS servers info on various services.
  • The migration of Atlas data from "C" to "D" tapes continues. We have migrated around 650 of the 1300 tapes so far. (I.e. we are around half way).
  • Successful UPS/Generator load test this morning.
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.

Listing by category:

  • Databases:
    • Switch LFC/3D to new Database Infrastructure.
  • Castor:
    • Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
    • Update to Castor version 2.1.15. This awaits successful resolution and testing of the new version.
    • Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
  • Networking:
    • Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
  • Fabric
    • Firmware updates on remaining EMC disk arrays (Castor, LFC)
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
lcgwms06.gridpp.rl.ac.uk, SCHEDULED OUTAGE 01/06/2016 11:00 30/06/2016 11:00 29 days, Server lcgwms06.gridpp.rl.ac.uk Decommissioning
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
122364 Green Less Urgent On Hold 2016-06-27 2016-06-29 cvmfs support at RAL-LCG2 for solidexperiment.org
121687 Yellow Less Urgent On Hold 2016-05-20 2016-05-23 packet loss problems seen on RAL-LCG perfsonar
120810 Green Urgent In Progress 2016-04-13 2016-06-24 Biomed Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users
120350 Green Less Urgent In Progress 2016-03-22 2016-05-06 LSST Enable LSST at RAL
119841 Red Less Urgent On Hold 2016-03-01 2016-04-26 LHCb HTTP support for lcgcadm04.gridpp.rl.ac.uk
117683 Yellow Less Urgent On Hold 2015-11-18 2016-04-05 CASTOR at RAL not publishing GLUE 2
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 729); CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC CMS HC Comment
29/06/16 100 100 100 100 100 100 100
30/06/16 100 100 100 100 100 100 100
01/07/16 100 100 100 100 100 100 100
02/07/16 100 100 100 100 100 100 100
03/07/16 100 100 100 100 100 100 100
04/07/16 100 100 100 100 100 100 100
05/07/16 100 100 100 100 100 100 100