RAL Tier1 Operations Report for 24th August 2016
Review of Issues during the week 17th to 24th August 2016.
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- As reported last week there in an ongoing intermittent problem with packet loss seen across a part of the Tier1 network. The cause is not yet understood.
Resolved Disk Server Issues
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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 seen over external connections is still being tracked.
Ongoing Disk Server Issues
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Notable Changes made since the last meeting.
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- Configuration change made yesterday such that CMS jobs on all worker nodes can access remote data without requiring to go through a proxy.
Service
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Scheduled?
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Outage/At Risk
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Start
|
End
|
Duration
|
Reason
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arc-ce01.gridpp.rl.ac.uk
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SCHEDULED
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OUTAGE
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25/08/2016 10:00
|
05/09/2016 15:00
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11 days, 5 hours
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ARC-CE01 being drained ahead of a reconfiguration and move to run on different infrastructure.
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srm-biomed.gridpp.rl.ac.uk,
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SCHEDULED
|
OUTAGE
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04/08/2016 14:00
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05/09/2016 14:00
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32 days,
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Storage for BIOMED is no longer supported since the removal of the GENScratch storage area.
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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 SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
- Update to Castor version 2.1.15. This awaits successful resolution and testing of the new version.
- Migration of LHCb data from T10KC to T10KD tapes.
- Networking:
- Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
- 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
|
srm-biomed.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
04/08/2016 14:00
|
05/09/2016 14:00
|
32 days,
|
Storage for BIOMED is no longer supported since the removal of the GENScratch storage area.
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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
|
123521
|
Green
|
Less Urgent
|
Waiting Reply
|
2016-08-22
|
2016-08-23
|
LHCb
|
Cannot upload data to RAL-BUFFER
|
123504
|
Green
|
Less Urgent
|
In Progress
|
2016-08-19
|
2016-08-23
|
T2K
|
proxy expiration
|
123403
|
Green
|
Less Urgent
|
Waiting Reply
|
2016-08-15
|
2016-08-17
|
CMS
|
FTS gets a SIGSEGV during a transfer
|
122827
|
Green
|
Less Urgent
|
In Progress
|
2016-07-12
|
2016-08-22
|
SNO+
|
Disk area at RAL
|
122364
|
Green
|
Less Urgent
|
On Hold
|
2016-06-27
|
2016-08-23
|
|
cvmfs support at RAL-LCG2 for solidexperiment.org
|
121687
|
Red
|
Less Urgent
|
On Hold
|
2016-05-20
|
2016-05-23
|
|
packet loss problems seen on RAL-LCG perfsonar
|
120350
|
Green
|
Less Urgent
|
Waiting Reply
|
2016-03-22
|
2016-08-09
|
LSST
|
Enable LSST at RAL
|
117683
|
Amber
|
Less Urgent
|
On Hold
|
2015-11-18
|
2016-04-05
|
|
CASTOR at RAL not publishing GLUE 2
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Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 729); CMS HC = CMS HammerCloud
Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas HC |
CMS HC |
Comment
|
17/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
18/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
19/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
20/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
21/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
22/08/16 |
100 |
98 |
100 |
100 |
100 |
100 |
N/A |
Single failure of AliEn-SE test.
|
23/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|