Tier1 Operations Report 2019-04-01

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RAL Tier1 Operations Report for 1st April 2019

Review of Issues during the week 26th March 2019 to the 1st April 2019.
  • This years CPU capacity entered production on 27th March. V11 CPU has been retired.
  • gdss733 had a double disk failure in Castor. Was out of production from 27th - 29th March.
  • CMS CPU efficiency has been poor all last week (25%-40%). Efficiency started dropping around the 20th March.
  • We fixed a problem that prevent LSST jobs from running (HTCondor had not been updated with the new VOMS server).
Current operational status and issues
Resolved Castor Disk Server Issues
Machine VO DiskPool dxtx Comments
gdss733 LHCb lcbhDsy d1t0 -
Ongoing Castor Disk Server Issues
Machine VO DiskPool dxtx Comments
Limits on concurrent batch system jobs.
  • ALICE - 1000
Notable Changes made since the last meeting.
  • NTR
Entries in GOC DB starting since the last report.
Service ID Scheduled? Outage/At Risk Start End Duration Reason
- - - - - - - -
Declared in the GOC DB
Service ID Scheduled? Outage/At Risk Start End Duration Reason
- - - - - - - -
  • No ongoing downtime
Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.

Listing by category:

  • DNS servers will be rolled out within the Tier1 network.

GGUS Tickets (Snapshot taken during morning of the meeting).

Request id Affected vo Status Priority Date of creation Last update Type of problem Subject Scope Solution
140521 ops in progress less urgent 01/04/2019 01/04/2019 Operations [Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer@gridftp.echo.stfc.ac.uk EGI
140511 cms in progress urgent 01/04/2019 01/04/2019 CMS_Facilities T1_UK_RAL SAM job run out of date WLCG
140447 dteam in progress less urgent 27/03/2019 02/04/2019 Network problem packet loss outbound from RAL-LCG2 over IPv6 EGI
140220 mice in progress less urgent 15/03/2019 25/03/2019 Other mice LFC to DFC transition EGI
139672 other in progress urgent 13/02/2019 18/03/2019 Middleware No LIGO pilots running at RAL EGI
138665 mice on hold urgent 04/12/2018 30/01/2019 Middleware Problem accessing LFC at RAL EGI
GGUS Tickets Closed Last week
Request id Affected vo Status Priority Date of creation Last update Type of problem Subject Scope Solution
140283 atlas solved less urgent 19/03/2019 20/03/2019 File Transfer UK RAL-LCG2: DESTINATION SRM_PUT_TURL error WLCG Corrected ownership of the CASTOR dir to atlas001:atlas
140278 cms solved urgent 19/03/2019 22/03/2019 CMS_Data Transfers Transfers failing from FNAL_Buffer to RAL_Disk WLCG we had a problem with ECHO mistakenly returning the correct size and checksum for files which failed transfers and were corrupt which resulted in them being marked as good by PhEDEx and then lying latent until they were accessed or transferred out.

Transfers recovered.

140210 atlas solved top priority 14/03/2019 19/03/2019 File Transfer Cannot access some files WLCG These files were lost from RAL-LCG2-ECHO_DATADISK, probably due to an FTS bug which should now be fixed. They were identified here because they were needed by the production team. The ticket submitter has now marked them lost in Rucio.

Independently, we have been analysing the results of the Rucio consistency checker. It identified 163 files lost from this disk. The 5 files listed in this ticket are among the 163. We will mark the remaining files lost in Rucio.

140177 cms solved urgent 13/03/2019 18/03/2019 CMS_Data Transfers RAL FTS - Transfers failing from T1_US_FNAL_Disk to some sites WLCG IPv6 was registered, although not fully enabled at FNAL. RAL had IPv6 fully enabled, so expected to transfer via that connection, however it was timing out and not falling back to IPv4. FNAL removed the IPv6 address, and since then the link has been green.
140082 atlas closed less urgent 06/03/2019 21/03/2019 Other RAL-LCG2 squid service degraded WLCG squid01 node is back serving requests.

There was an overnight problem with the underlying storage for this VM node.

139990 cms solved urgent 01/03/2019 20/03/2019 CMS_AAA WAN Access T1_UK_RAL xrootd segfaulted WLCG The issue is intermittent and occasional. This segfault is most likely a known problem, which will be addressed in xrootd version 4.9, along with other fixes. RAL will install this when available.
139983 t2k.org closed less urgent 28/02/2019 21/03/2019 File Access Failed to bring files online at RAL-tape EGI See above.
139858 cms closed urgent 23/02/2019 18/03/2019 CMS_Data Transfers Failing transfers of 7 files from T1_UK_RAL_Disk to T2_FR_GRIF_LLR WLCG Missing chunks, so deleted the files and they are now retransferred.
139639 cms closed very urgent 12/02/2019 22/03/2019 CMS_AAA WAN Access file open error at RAL WLCG files retransfered
139476 mice closed less urgent 01/02/2019 22/03/2019 Other LFC dump for MICE VO EGI DB dump provided.
139306 dteam closed less urgent 24/01/2019 20/03/2019 Monitoring perfsonar hosts need updating EGI Hosts updated and additional information added. Thanks!
138500 cms closed urgent 26/11/2018 22/03/2019 CMS_Data Transfers Transfers failing from T2_PL_Swierk to RAL WLCG block size changed to default
138033 atlas solved urgent 01/11/2018 26/03/2019 Other singularity jobs failing at RAL EGI As the new batch containers have been fully rolled out and appear to have been working since the 18/03/19 I'm going to call this one as solved.

Availability Report

Day Atlas Atlas-Echo CMS LHCB Alice OPS Comments
2019-03-19 100 100 100 100 100 93
2019-03-20 100 100 100 100 100 100
2019-03-21 100 100 100 100 100 100
2019-03-22 100 100 100 100 100 100
2019-03-23 81 81 100 100 100 100
2019-03-24 100 100 100 100 100 100
2019-03-25 100 100 100 100 100 100
2019-03-26 100 100 100 100 100 100
Hammercloud Test Report
Target Availability for each site is 97.0% Red <90% Orange <97%
Day Atlas HC CMS HC Comment
2019-03-19 96 99
2019-03-20 100 99
2019-03-21 100 N/A
2019-03-22 100 N/A
2019-03-23 100 100
2019-03-24 100 100
2019-03-25 100 99
2019-03-26 100 99

Key: Atlas HC = Atlas HammerCloud (Queue RAL-LCG2_UCORE, Template 841); CMS HC = CMS HammerCloud

Notes from Meeting.