Tier1 Operations Report 2014-11-26

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RAL Tier1 Operations Report for 26th November 2014

Review of Issues during the week 19th to 26th November 2014.
  • On the evening of Tuesday 18th, the CMS transfer manager machine (lcgclsf02) failed. The services failed over to the backup. A replacement machine was prepared and put into service that afternoon. The following day the original system was fixed and returned to service.
  • In the early hours of Friday 21st Nov. there was a problem of locking sessions in the Castor database that affected CMS & LHCb. Whilst this was transitory the cause has been understood and a fix will be provided in a future version of Castor.
Resolved Disk Server Issues
  • GDSS673 (LhcbRawDst - D0T1) had failed during the evening of Friday 14th November. The server was returned to production around midday on Thursday 20th Nov.
Current operational status and issues
  • Some problems on Atlas Castor instance. At various times in recent weeks the Atlas workload has led to differing groups of disk servers spending a lot of time in a "wait i/o" state. This is triggered by the numbers of reads using xroot and has led to some SAM test failures.
Ongoing Disk Server Issues
  • None.
Notable Changes made this last week.
  • Latest WMS updates (EMI 3 update 22) applied to WMSs.
  • FTS3 upgraded to 3.2.30
  • OS Errata updates applied to all Castor systems (apart from GEN instance for which this had already been done).
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.
  • The rollout of the RIP protocol to the Tier1 routers still has to be completed.
  • First quarter 2015: Circuit testing of the remaining (i.e. non-UPS) circuits in the machine room.(Provisional dates: week 12-16 January).
  • Castor headnode upgrades to SL6: (Assume 4 hour outage of Castor instance in each case for stager updates).
    • Tuesday 2nd Dec - LHCb; Tues 9th Dec - CMS; Wed 10th Dec - Atlas; Wednesday 7th Jan - GEN; Thursday 8th Jan - Nameserver (transparent - at risk)

Listing by category:

  • Databases:
    • A new database (Oracle RAC) has been set-up to host the Atlas 3D database. This is updated from CERN via Oracle GoldenGate. This system is yet to be brought into use. (Currently Atlas 3D/Frontier still uses the OGMA datase system, although this was also changed to update from CERN using Oracle Golden Gate.)
    • Switch LFC/3D to new Database Infrastructure.
  • Castor:
    • Update Castor headnodes to SL6.
    • Fix discrepancies were found in some of the Castor database tables and columns. (The issue has no operational impact.)
  • Networking:
    • Move switches connecting the 2011 disk servers batches onto the Tier1 mesh network.
    • Make routing changes to allow the removal of the UKLight Router.
    • Enable the RIP protocol for updating routing tables on the Tier1 routers.
  • Fabric
    • Migration of data to new T10KD tapes. (Migration of CMS from 'B' to 'D' tapes underway; migration of GEN from 'A' to 'D' tapes to follow.)
    • Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
    • There will be circuit testing of the remaining (i.e. non-UPS) circuits in the machine room (Expected first quarter 2015).
Entries in GOC DB starting between the 19th and 26th November 2014.
Service Scheduled? Outage/At Risk Start End Duration Reason
Castor (srm endpoints). SCHEDULED WARNING 25/11/2014 11:00 25/11/2014 12:00 1 hour At risk on some castor instances while we deploy errata updates
Whole site UNSCHEDULED WARNING 25/11/2014 07:00 25/11/2014 08:00 1 hour Site warning during firewall configuration change.
lcgfts3.gridpp.rl.ac.uk, SCHEDULED WARNING 24/11/2014 10:00 24/11/2014 12:00 2 hours At risk for FTS3 upgrade to 3.2.30
srm-cms-disk.gridpp, srm-cms.gridpp.rl.ac.uk UNSCHEDULED WARNING 20/11/2014 14:00 20/11/2014 15:00 1 hour At risk while we return a CMS Castor headnode to production


Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
110360 Green Less Urgent Waiting for Reply 2014-11-25 2014-11-25 SNO+ Jobs failing to load cvmfs data
110244 Green Less Urgent In progress 2014-11-19 2014-11-24 None LFC Webdav support
109712 Green Urgent On Hold 2014-10-29 2014-11-10 CMS Glexec exited with status 203; ...
109694 Green Urgent On hold 2014-11-03 2014-11-24 SNO+ gfal-copy failing for files at RAL
109276 Green Urgent In Progress 2014-11-22 2014-11-24 CMS Submissions to RAL FTS3 REST interface are failing for some users (re-opened)
108944 Amber Urgent In Progress 2014-10-01 2014-11-24 CMS AAA access test failing at T1_UK_RAL
107935 Red Less Urgent On Hold 2014-08-27 2014-11-03 Atlas BDII vs SRM inconsistent storage capacity numbers
106324 Red Urgent On Hold 2014-06-18 2014-10-13 CMS pilots losing network connections at T1_UK_RAL
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 508); CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC CMS HC Comment
19/11/14 100 100 98.3 92.8 100 100 n/a SRM test failures. For CMS there was a general problem affecting multiple sites.
20/11/14 100 100 99.2 99.3 100 99 n/a Single SRM test failures.
21/11/14 100 100 95.8 92.4 91.7 99 n/a SRM test failures caused by problem of locking sessions in database.
22/11/14 100 100 100 100 100 100 n/a
23/11/14 100 100 100 100 100 87 95
24/11/14 100 100 100 100 95.8 96 n/a Single SRM test failure.
25/11/14 100 100 99.1 100 100 100 n/a Expired proxy affected Atlas tests for many sites.