RAL Tier1 Operations Report for 13th August 2018
Review of Issues during the week 6th August to the 13th August 2018.
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- Tier-1 at RAL have had an unscheduled outage for Echo since Friday evening (10/8/18). The initial cause of this issue is thought to be a combination of client I/O and cluster I/O (moving data onto new hardware), which is causing an excessive amount of memory usage. This in turn is causing machines to start swapping heavily, which is placing even more load on the cluster. This has necessitated pausing all I/O operations on the cluster to try and reduce memory usage while we are restoring the cluster to a healthy state, and putting measures in place to reduce the memory usage on the storage nodes.
- While this investigation and work is carried out the ongoing downtime has been extended until 12:00 16/08/2018
- CMS jobs experiencing periodic failures when accessing files. Problem appears to be network related. This was tracked down to Docker containers losing all connectivity. Also causing some ATLAS jobs to fail with “lost heartbeat” errors. Problem identified requiring some machines to be re-installed. Batch farm at half capacity while this is being done.
- CMS AAA - service is heavily loaded (lots of popular data on Echo), causing machines to go down, or slow to the point SAM tests start failing. Restarting machines helps (on a cron). Working continues on adding throttling.
Current operational status and issues
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- Requirement to purchase new SIM (an associated contract), to replace the failed EE SIM in the SMS system.
Resolved Castor Disk Server Issues
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Ongoing Castor Disk Server Issues
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- gdss747 - Atlas - d1t0 - atlasStripInput : Currently in intervention.
Limits on concurrent batch system jobs.
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Notable Changes made since the last meeting.
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Entries in GOC DB starting since the last report.
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Advanced warning for other interventions
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The following items are being discussed and are still to be formally scheduled and announced.
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Listing by category:
- Castor:
- Update systems to use SL7 and configured by Quattor/Aquilon. (Tape servers done)
- Move to generic Castor headnodes.
- Internal
- DNS servers will be rolled out within the Tier1 network.
Open
GGUS Tickets (Snapshot taken during morning of the meeting).
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Request id
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Affected vo
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Status
|
Priority
|
Date of creation
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Last update
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Type of problem
|
Subject
|
Scope
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136563
|
cms
|
in progress
|
urgent
|
06/08/2018
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06/08/2018
|
CMS_Data Transfers
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Possibly corrupted files at RAL
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WLCG
|
136366
|
mice
|
in progress
|
less urgent
|
25/07/2018
|
26/07/2018
|
Local Batch System
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Remove MICE Queue from RAL T1 Batch
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EGI
|
136358
|
cms
|
on hold
|
urgent
|
25/07/2018
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03/08/2018
|
CMS_Facilities
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T1_UK_RAL WN-xrootd-access failure
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WLCG
|
136199
|
lhcb
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in progress
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very urgent
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18/07/2018
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07/08/2018
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File Transfer
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Lots of submitted transfers on RAL FTS
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WLCG
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136028
|
cms
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in progress
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top priority
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10/07/2018
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07/08/2018
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CMS_AAA WAN Access
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Issues reading files at T1_UK_RAL_Disk
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WLCG
|
124876
|
ops
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in progress
|
less urgent
|
07/11/2016
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23/07/2018
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Operations
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[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
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EGI
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GGUS Tickets Closed Last week
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Request id
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Affected vo
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Status
|
Priority
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Date of creation
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Last update
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Type of problem
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Subject
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Scope
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136537
|
ops
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verified
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less urgent
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03/08/2018
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06/08/2018
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Operations
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[Rod Dashboard] Issue detected : org.bdii.GLUE2-Validate@site-bdii.gridpp.rl.ac.uk
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EGI
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136460
|
cms
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solved
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urgent
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30/07/2018
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01/08/2018
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CMS_Data Transfers
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Transfers failing to RAL_Buffer
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WLCG
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136408
|
cms
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solved
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urgent
|
27/07/2018
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01/08/2018
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CMS_Data Transfers
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missing files at RAL
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WLCG
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136270
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cms
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closed
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urgent
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22/07/2018
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07/08/2018
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CMS_Facilities
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T1_UK_RAL xrootd access failures
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WLCG
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136229
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cms
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closed
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very urgent
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19/07/2018
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02/08/2018
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Data Management - generic
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RAL FTS Service not reachable via IPv6
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EGI
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136138
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t2k.org
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verified
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urgent
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16/07/2018
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02/08/2018
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File Access
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Extremely long download times for T2K files on tape at RALL - Part 2
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EGI
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136097
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other
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closed
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urgent
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13/07/2018
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03/08/2018
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Operations
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Please restart frontier-squid on RAL cvmfs stratum 1
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EGI
|
134685
|
dteam
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solved
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less urgent
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23/04/2018
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08/08/2018
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Middleware
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please upgrade perfsonar host(s) at RAL-LCG2 to CentOS7
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EGI
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Target Availability for each site is 97.0%
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Red <90%
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Orange <97%
|
Day
|
Atlas
|
Atlas-Echo
|
CMS
|
LHCB
|
Alice
|
OPS
|
Comments
|
2018-07-30
|
100
|
100
|
100
|
100
|
100
|
100
|
|
2018-07-31
|
100
|
100
|
99
|
100
|
100
|
100
|
|
2018-08-01
|
100
|
100
|
100
|
100
|
100
|
100
|
|
2018-08-02
|
100
|
100
|
100
|
100
|
100
|
100
|
|
2018-08-03
|
100
|
100
|
100
|
100
|
100
|
100
|
|
2018-08-04
|
100
|
100
|
98
|
100
|
100
|
100
|
|
2018-08-05
|
100
|
100
|
99
|
100
|
100
|
100
|
|
2018-08-06
|
100
|
100
|
99
|
100
|
100
|
100
|
|
Target Availability for each site is 97.0%
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Red <90%
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Orange <97%
|
Day |
Atlas HC |
CMS HC |
Comment
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2018-07-31 |
91 |
96 |
|
2018-07-01 |
100 |
98 |
|
2018-07-02 |
100 |
99 |
|
2018-07-03 |
100 |
99 |
|
2018-07-04 |
98 |
99 |
|
2018-07-05 |
100 |
98 |
|
2018-07-06 |
100 |
98 |
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Key: Atlas HC = Atlas HammerCloud (Queue RAL-LCG2_UCORE, Template 841); CMS HC = CMS HammerCloud