Tier1 Operations Report 2019-05-06

From GridPP Wiki
Jump to: navigation, search

RAL Tier1 Operations Report for 5th May 2019

Review of Issues during the week 29th April 2019 to the 5th May 2019.
  • We are seeing high outbound packet loss over IPv6. Investigation has restarted now that the appropriate resources are back in office.
  • High CMS job failure rates. Due to the workloads submitted by CMS, there is currently no issue. We are however still looking at making changes to the XrootD caches on the WN to improve performance.
  • On Wednesday 24th April gdss738 (LHCb) crashed and was removed from production. It was returned to production on Friday 26th April at lunch.
Current operational status and issues
Resolved Castor Disk Server Issues
Machine VO DiskPool dxtx Comments
- - - - -
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.
Open

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
140870 t2k.org in progress less urgent 25/04/2019 08/05/2019 Data Management - generic Files vanished from RAL tape? EGI
140773 lhcb in progress top priority 18/04/2019 08/05/2019 Storage Systems Removal of Echo unbearably slow WLCG
140447 dteam on hold less urgent 27/03/2019 08/05/2019 Network problem packet loss outbound from RAL-LCG2 over IPv6 EGI
140220 mice in progress less urgent 15/03/2019 08/04/2019 Other mice LFC to DFC transition EGI
139672 other in progress urgent 13/02/2019 30/04/2019 Middleware No LIGO pilots running 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
140965 cms solved urgent 02/05/2019 03/05/2019 CMS_Data Transfers Datatransfers T2_AT_VIenna -> T1_UK_RAL_Buffer failing WLCG Possible corruption on the file coming from Vienna may have made the file un-deleteable at RAL. The file was replaced with a new copy at Vienna and transfer in debug stream is now green.
140725 cms closed urgent 15/04/2019 30/04/2019 CMS_Facilities T1_UK_RAL intermittent xrootd relative failures WLCG reason is clear, more additional hardware is on the way.
140683 lhcb closed top priority 10/04/2019 29/04/2019 Local Batch System Pilots failing at RAL across all CEs WLCG Problem was resolved and checks put in place to prevent recurrence.
140660 cms solved urgent 09/04/2019 02/05/2019 CMS_Central Workflows FIle read issues for Workflows where data is located at T1_UK_RAL WLCG The gridmap has been replaced and we appear to be working again. As such I'm going to close this ticket as implementation of the the full solution is beyond the scope of this ticket.
138033 atlas closed urgent 01/11/2018 02/05/2019 Other singularity jobs failing at RAL EGI Hi James,

looks good. The test I sent succeeded. Closing ticket.

cheers alessandra

Availability Report

Day Atlas Atlas-Echo CMS LHCB Alice OPS Comments
2019-04-22 100 100 100 100 100 100
2019-04-23 100 100 98 97 83 100
2019-04-24 100 100 100 100 100 100
2019-04-25 100 100 100 100 100 100
2019-04-26 100 100 100 100 100 100
2019-04-27 100 100 100 100 100 100
2019-04-28 100 100 100 100 100 100
2019-04-29 100 100 100 100 100 100
Hammercloud Test Report
Target Availability for each site is 97.0% Red <90% Orange <97%
Day Atlas HC CMS HC Comment
2019-04-22 - 97
2019-04-23 100 100
2019-04-24 100 n/a
2019-04-25 100 n/a
2019-04-26 100 n/a
2019-04-27 100 99
2019-04-28 100 96
2019-04-29 100 96

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

Notes from Meeting.