Tier1 Operations Report 2015-01-21

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RAL Tier1 Operations Report for 21st January 2015

Review of Issues during the week 14th to 21st January 2015.
  • The high load on the LHCb SRMs reported last week continued into this reporting period with intermittent SAM test failures. The problem has been mitigated: The particular LHCb workflow that loaded the SRMs heavily has eased and a third system has been added into the LHCb SRM alias.
  • Electrical circuit testing in the machine room has continued into this week. Some further problems have been encountered and we have tripped off some (a few tens of) worker nodes. However, no critical services have been affected.
Resolved Disk Server Issues
  • None
Current operational status and issues
  • We are running with a single router connecting the Tier1 network to the site network, rather than a resilient pair.
Ongoing Disk Server Issues
  • None
Notable Changes made this last week.
  • The bulk of the safety checking of the electrical power circuits in the machine room has been completed. The whole task will finish tomorrow, Thursday 22nd January.
  • The problem with xroot access to the Castor GEN instance was fixed during the afternoon of Wednesday 14th Jan. (This problem did not affect ALICE).
  • A third SRM system was added to the LHCb alias (sm-lhcb.gridpp.rl.ac.uk) on Thursday 15th Jan.
  • The Castor Nameserver headnodes were updated to SL6 on Monday 19th Jan. This operation was transparent to Castor users.
  • The migration of all data off T10000A & B media is almost complete.
Declared in the GOC DB
Service Scheduled? Outage/At Risk Start End Duration Reason
Whole site SCHEDULED WARNING 20/01/2015 08:30 22/01/2015 18:00 2 days, 9 hours and 30 minutes Warning during safety checks on power circuits in machine room. Testing carried out during working hours on each day.
Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.
  • Investigate problems on the primary Tier1 router. We plan to run the primary (failing) router for a few hours tomorrow (Thursday 22nd Jan) in order to trap the problem. If there is a failure it will take a few minutes for a manual switch back to the secondary to be effected.
  • The circuit testing of the remaining (i.e. non-UPS) circuits in the machine room in ongoing and will be completed tomorrow (Thursday 22nd Jan).
  • A patch to FTS3 (to version 3.2.31) will be rolled out in the next days.
  • OS updates on disk servers (expected in week 26-30 Jan).
  • Move of connection for CERN Backup link.

Listing by category:

  • Databases:
    • Application of Oracle PSU patches to database systems.
    • 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.
    • Update to Oracle 11.2.0.4
  • Castor:
    • Update SRMs to new version (includes updating to SL6).
    • Fix discrepancies were found in some of the Castor database tables and columns. (The issue has no operational impact.)
    • Update Castor to 2.1-14-latest, this depends on SL6 being deployed.
  • Networking:
    • Resolve problems with primary Tier1 Router
    • 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. (Install patch to Router software).
  • Fabric
    • Migration of data to new T10KD tapes. (Migration of CMS from 'B' to 'D' tapes finished; migration of GEN from 'A' to 'D' almost complete.)
    • Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
Entries in GOC DB starting between the 14th and 21st January 2015.
Service Scheduled? Outage/At Risk Start End Duration Reason
Whole site SCHEDULED WARNING 20/01/2015 08:30 22/01/2015 18:00 2 days, 9 hours and 30 minutes Warning during safety checks on power circuits in machine room. Testing carried out during working hours on each day.
All Castor (all SRM endpoints) SCHEDULED WARNING 19/01/2015 09:15 19/01/2015 16:00 6 hours and 45 minutes Warning during OS upgrade (SL6) on Castor Nameservers.
Whole site SCHEDULED WARNING 13/01/2015 18:30 15/01/2015 18:00 1 day, 23 hours and 30 minutes Warning during safety checks on power circuits in machine room. Testing carried out during working hours on each day.
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
111120 Green Less Urgent In Progress 2015-01-12 2015-01-15 Atlas large transfer errors from RAL-LCG2 to BNL-OSG2
110605 Yellow Less Urgent In Progress 2014-12-08 2015-01-20 ops [Rod Dashboard] Issues detected at RAL-LCG2 (srm-cms-disk.gridpp.rl.ac.uk)
109712 Red Urgent In Progress 2014-10-29 2015-01-09 CMS Glexec exited with status 203; ...
109694 Red Urgent On hold 2014-11-03 2015-01-20 SNO+ gfal-copy failing for files at RAL
108944 Red Urgent In Progress 2014-10-01 2015-01-19 CMS AAA access test failing at T1_UK_RAL
107935 Red Less Urgent On Hold 2014-08-27 2015-01-20 Atlas BDII vs SRM inconsistent storage capacity numbers
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
14/01/15 100 100 100 100 55.6 100 100 Load (stripping campaign) affecting LHCb SRMs. User timeouts on tests.
15/01/15 100 100 100 100 97.3 100 78 Load. Single SRM test failure ([SRM_FILE_BUSY]).
16/01/15 100 100 100 100 90.0 90 100 Config problem as additional SRM set-up.
17/01/15 100 100 100 100 100 100 100
18/01/15 100 100 100 100 100 100 100
19/01/15 100 100 100 100 100 100 99
20/01/15 100 100 100 100 100 100 100
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