Tier1 Operations Report 2016-12-07

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RAL Tier1 Operations Report for 7th December 2016

Review of Issues during the week 30th November and 7th December 2016.
  • There a problem on one of the Power Distribution Units to a rack in the UPS room during the early hours of Monday morning (5th Dec). This affected two network switches - which in turn affected some core services (including the TopBDII). This was resolved by a member of staff attending during the night.
Resolved Disk Server Issues
  • GDSS726 (CMSDisk - D1T0) reported FSProbe errors on Thursday 1st Dec. and was taken out of service. It was returned to service the following day although the tests did not find any problems.
  • GDSS747 (AtlasDataDisk - D1T0) also failed on Thursday 1st Dec. Two failed disks were found. The server was returned to service on Monday (5th Dec).
  • GDSS650 (LHCbUser - D1T0) failed on Saturday morning, 3rd Dec. It was returned to service yesterday (6th Dec). A disk had failed - and the replacement to that disk also failed. During teh RAID rebuild a further disk drive started reporting problems and was also swapped.
  • GDSS701 (LHCbDst - D1T0) was taken out of service on Saturday (3rd Dec) when it reported FSProbe errors when a disk was replaced. It was returned to service on the 5th Dec.
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.
  • The intermittent, low-level, load-related packet loss that has been seen over external connections is still being monitored. The replacement of the UKLight router appears to have reduced this. However, we are closely monitoring the links to confirm that any remaining error rates are low and typical for this type of wide area link.
Ongoing Disk Server Issues
  • None
Notable Changes made since the last meeting.
  • Nothing p[articular to report.
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:

  • Firmware update on Clustervision '13 disk servers. These are distributed as follows: AtlasDataDisk: 12; CMSDisk: 5; LHCbDst: 12.
  • Merge AtlasScratchDisk and LhcbUser into larger disk pools. For LHCbUser this will be done on Thursday 8th Dec.

Listing by category:

  • Castor:
    • Merge AtlasScratchDisk and LhcbUser into larger disk pools
    • Update to Castor version 2.1.15. Planning to roll out January 2017. (Proposed dates: 10th Jan: Nameserver; 17th Jan: First stager (LHCb); 24th Jan: Stager (Atlas); 26th Jan: Stager (GEN); 31st Jan: Final stager (CMS)).
    • Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
  • Fabric
    • Firmware updates on older disk servers.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
lcgbdii.gridpp.rl.ac.uk, UNSCHEDULED OUTAGE 05/12/2016 01:15 05/12/2016 03:09 1 hour and 54 minutes networking problems affecting part of the Tier-1 services
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
125348 Green Top Priority In Progress 2016-12-05 2016-12-05 CMS Request to update phedex
125157 Green Less Urgent In Progress 2016-11-24 2016-12-07 Creation of a repository within the EGI CVMFS infrastructure
124876 Green Less Urgent On Hold 2016-11-07 2016-11-21 OPS [Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
124606 Red Top Priority In Progress 2016-10-24 2016-12-02 CMS Consistency Check for T1_UK_RAL
124478 Green Less Urgent In Progress 2016-11-18 2016-11-18 NA62 Jobs submitted via RAL WMS stuck in state READY forever and ever and ever
122827 Green Less Urgent In Progress 2016-07-12 2016-12-01 SNO+ Disk area at RAL
117683 Red Less Urgent On Hold 2015-11-18 2016-10-05 CASTOR at RAL not publishing GLUE 2 (Updated. There are ongoing discussions with GLUE & WLCG)
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 808); CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC CMS HC Comment
30/11/16 100 100 100 100 100 N/A 100
01/12/16 100 100 100 99 100 N/A 100 Single SRM test failure: User timeout over
02/12/16 100 100 100 74 100 N/A 100 Block of SRM test failures during the day (User timeout).
03/12/16 100 100 100 99 100 N/A 100 Single SRM test failure: User timeout over
04/12/16 100 100 100 100 100 N/A 100
05/12/16 100 100 100 98 100 N/A 100 Single SRM test failure: User timeout over
06/12/16 100 100 100 100 100 N/A 98
Notes from Meeting.
  • None Yet