Tier1 Operations Report 2017-08-16

From GridPP Wiki
Jump to: navigation, search

RAL Tier1 Operations Report for 16th August 2017

Review of Issues during the week 9th to 16th August 2017.
  • There was a problem with Atlas Castor during the afternoon / early evening of Thursday 10th August. Atlas Castor was restarted and the problem went away during the evening. However, the cause is not understood. We have previously had some problems with the Atlas Castor SRMs but the symptoms of this failure appeared different to those.
Resolved Disk Server Issues
  • GDSS753 (AtlasDataDisk - D1T0) failed in the early hours of Thursday 10th August. It was returned to production early Friday afternoon (11th). Following a disk drive failure the RAID card tried a rebuild which also failed (either the spare drive was bad or the failed drive came back and initially appeared good).
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. CMS are also looking at file access performance and have turned off "lazy-download". The CMS SRM SAM test success rate has improved since the Castor 2.1.16 upgrade on the 25th May, although is still not 100%. Our investigations are ongoing.
  • There is a problem on the site firewall which is causing problems for some specific data flows. Discussions have been taking place with the vendor. This is having an effect on our data that flows through the firewall (such as to/from worker nodes).
Ongoing Disk Server Issues
  • None
Limits on concurrent batch system jobs.
  • CMS Multicore 550
Notable Changes made since the last meeting.
  • On Tuesday (15th August) a new version of XRootD was installed on the Echo gateways (v20170724-06470a6).
  • The CVMFS Stratum-1 service (a 2-node High-Availability cluster) is now dual stack with IPv6.
  • This morning (16th Aug) one of the three links that make up the OPN connection was moved to a new circuit that uses a different route - improving resilience of the overall OPN link..
Declared in the GOC DB
Service Scheduled? Outage/At Risk Start End Duration Reason
srm-superb.gridpp.rl.ac.uk, SCHEDULED OUTAGE 20/07/2017 16:00 30/08/2017 13:00 40 days, 21 hours SuperB no longer supported on Castor storage. Retiring endpoint.
srm-hone.gridpp.rl.ac.uk, SCHEDULED OUTAGE 20/07/2017 16:00 30/08/2017 13:00 40 days, 21 hours H1 no longer supported on Castor storage. Retiring endpoint.
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:

  • Upgrade the FTS3 service to a version that will no longer support the SOAP interface. The SOAP interface was disabled on Monday (17th July).
  • Re-distribute the date in Echo onto the 2015 capacity hardware. (Ongoing)

Listing by category:

  • Castor:
    • Move to generic Castor headnodes.
  • Echo:
    • Re-distribute the data in Echo onto the remaining 2015 capacity hardware.
  • Networking
    • Extend the number of services on the production network with IPv6 dual stack. (Done for Perfsonar, all squids and the CVMFS Stratum-1 servers).
  • Services
    • The production FTS will be updated now the requirement to support the deprecated SOAP interface has been removed.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
srm-hone.gridpp.rl.ac.uk, SCHEDULED OUTAGE 20/07/2017 16:00 30/08/2017 13:00 40 days, 21 hours H1 no longer supported on Castor storage. Retiring endpoint.
srm-superb.gridpp.rl.ac.uk, SCHEDULED OUTAGE 20/07/2017 16:00 30/08/2017 13:00 40 days, 21 hours SuperB no longer supported on Castor storage. Retiring endpoint.
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
130093 Green Less Urgent In Progress 2017-08-16 2017-08-16 CMS IPv6 address for CMS UK xrootd redirector at RAL?
129998 Green Less Urgent In Progress 2017-08-09 2017-08-15 Atlas High job failure rate at RAL-LCG2-ECHO_MCORE caused by lost heartbeats
128991 Green Less Urgent On Hold 2017-06-16 2017-07-20 Solid solidexperiment.org CASTOR tape support
127597 Red Urgent On Hold 2017-04-07 2017-06-14 CMS Check networking and xrootd RAL-CERN performance
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 2017-07-06 CASTOR at RAL not publishing GLUE 2.
Availability Report
Day OPS Alice Atlas CMS LHCb Atlas Echo Comment
09/08/17 100 100 100 92 100 100 Sporadic SRM test failures with "user timeout".
10/08/17 100 100 77 76 100 100 Atlas Castor problems during the evening; CMS Sporadic SRM test failures with "user timeout".
11/08/17 100 100 100 83 100 100 Sporadic SRM test failures with "user timeout".
12/08/17 100 100 100 81 100 100 Sporadic SRM test failures with "user timeout".
13/08/17 100 100 100 86 100 100 Sporadic SRM test failures with "user timeout".
14/08/17 100 100 100 84 100 100 A lot of SRM test failures with "user timeout"
15/08/17 96.2 100 100 97 100 100 CMS: A small number of SRM test failures with "user timeout".
Hammercloud Test Report

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

Day Atlas HC Atlas HC Echo CMS HC Comment
09/08/17 95 96 100
10/08/17 71 88 100
11/08/17 96 100 100
12/08/17 96 100 100
13/08/17 100 100 100
14/08/17 100 100 100
15/08/17 100 100 100
Notes from Meeting.
  • None yet