RAL Tier1 Operations Report for 23rd November 2016
Review of Issues during the week 16th to 23rd November 2016.
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- There was a problem with one of the Atlas Frontier launchpads on Monday 14th. All three such systems were updated to the newer release (3.5.22)
Resolved Disk Server Issues
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- GDSS713 (CMS Disk - D1T0) crashed on Sunday morning. It was returned to service the following day - initially read-only. Our checks did not find any fault on the server.
Current operational status and issues
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- There is a problem seen by LHCb of a low but persistent rate of failure when copying the results of batch jobs to Castor. There is also a further problem that sometimes occurs when these (failed) writes are attempted to storage at other sites.
- The intermittent, low-level, load-related packet loss that has been seen over external connections is still being tracked. The replacement of the UKLight router appears to have reduced this - but we are allowing more time to pass before drawing any conclusions.
Ongoing Disk Server Issues
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Notable Changes made since the last meeting.
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- There was a short (one to two hour) interruption to tape mounts while the system that runs the tape library control software was swapped on Tuesday morning (15th Nov).
- LHCb writing to the 'D' tapes. The migration of their data from 'C' to 'D' tapes is underway - with around 100 (some 10%) of the tapes done.
None
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:
- Merge AtlasScratchDisk and LhcbUser into larger disk pools
- Update to Castor version 2.1.15. Planning to roll out January 2017. (Proposed dates: 10th Jan: Nameserver; 17th Jan: First stager (LHCb); 24th Jan: Stager (Atlas); 26th Jan: Stager (GEN); 31st Jan: Final stager (CMS)).
- Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
- Fabric
- Firmware updates on older disk servers.
Entries in GOC DB starting since the last report.
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Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk
|
UNSCHEDULED
|
OUTAGE
|
18/11/2016 14:30
|
21/11/2016 11:00
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2 days, 20 hours and 30 minutes
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Echo cluster is coming back online, following on from shutdown for backend network upgrade behind Echo Storage service
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gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk
|
UNSCHEDULED
|
OUTAGE
|
16/11/2016 14:30
|
18/11/2016 14:30
|
2 day,
|
Follow on work dealing with bringing cluster back online after backend network upgrade behind Echo Storage service
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gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk
|
SCHEDULED
|
OUTAGE
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16/11/2016 10:30
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16/11/2016 14:30
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4 hours
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Upgrading backend network behind Echo Storage service
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Open GGUS Tickets (Snapshot during morning of meeting)
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GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
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124876
|
Green
|
Less Urgent
|
On Hold
|
2016-11-07
|
2016-11-15
|
OPS
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[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
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124785
|
Red
|
Urgent
|
Reopened
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2016-11-02
|
2016-11-09
|
CMS
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Configuration updated AAA - CMS Site Name missing
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124606
|
Yellow
|
Very Urgent
|
In Progress
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2016-10-24
|
2016-11-01
|
CMS
|
Consistency Check for T1_UK_RAL
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122827
|
Green
|
Less Urgent
|
Waiting for Reply
|
2016-07-12
|
2016-10-11
|
SNO+
|
Disk area at RAL
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120350
|
Yellow
|
Less Urgent
|
In Progress
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2016-03-22
|
2016-08-09
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LSST
|
Enable LSST at RAL
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117683
|
Red
|
Less Urgent
|
On Hold
|
2015-11-18
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2016-10-05
|
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CASTOR at RAL not publishing GLUE 2 (Updated. There are ongoing discussions with GLUE & WLCG)
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Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 808); CMS HC = CMS HammerCloud
Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas HC |
CMS HC |
Comment
|
16/11/16 |
100 |
100 |
100 |
100 |
100 |
99 |
N/A |
|
17/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
18/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
19/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
20/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
21/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
22/11/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|