RAL Tier1 Operations Report for 7th December 2016
Review of Issues during the week 30th November and 7th December 2016.
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- It was found that some worker nodes were being put offline owing to clock drift. (This was around 10% of them on Monday). This was traced to a problem within the NTP daemon and was fixed by a configuration change.
Resolved Disk Server Issues
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- GDSS726 (CMSDisk - D1T0) reported FSProbe errors on Thursday 1st Dec. and was taken out of service. It was returned to service the following day although the tests did not find any problems.
- GDSS747 (AtlasDataDisk - D1T0) also failed on Thursday 1st Dec. Two failed disks were found. The server was returned to service on Monday (5th Dec).
- GDSS650 (LHCbUser - D1T0) failed on Saturday morning, 3rd Dec. It was returned to service yesterday (6th Dec). A disk had failed - and the replacement to that disk also failed. During teh RAID rebuild a further disk drive started reporting problems and was also swapped.
- GDSS701 (LHCbDst - D1T0) was taken out of service on Saturday (3rd Dec) when it reported FSProbe errors when a disk was replaced. It was returned to service on the 5th Dec.
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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- Maintenance was carried out on the UPS and generator in R89 yesterday.
- There was restart test of the ECHO Ceph system yesterday> this was to understand how best to do this and set-up appropriate operating procedures.
- LHCb writing to the 'D' tapes. The migration of their data from 'C' to 'D' tapes is underway - with around 300 (some 30%) of the tapes done.
- An update to the FTS3 service (to version 3.5.7) has taken place this morning.
- Increased number of CMS multicore jobs allowed to run as the previous limit was a bit too low. (This is a further increase as compared to that of around a month ago).
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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Pending - but not yet formally announced:
- Firmware update on Clustervision '13 disk servers. These are distributed as follows: AtlasDataDisk: 12; CMSDisk: 5; LHCbDst: 12.
- Merge AtlasScratchDisk and LhcbUser into larger disk pools - Possible date Thursday 8th Dec.
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
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Scheduled?
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Outage/At Risk
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Start
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End
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Duration
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Reason
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lcgfts3.gridpp.rl.ac.uk,
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SCHEDULED
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WARNING
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30/11/2016 11:00
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30/11/2016 13:00
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2 hours
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Upgrade of FTS3 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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125157
|
Green
|
Less Urgent
|
Waiting for Reply
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2016-11-24
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2016-11-29
|
|
Creation of a repository within the EGI CVMFS infrastructure
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124876
|
Green
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Less Urgent
|
On Hold
|
2016-11-07
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2016-11-21
|
OPS
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[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
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124606
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Red
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Top Priority
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In Progress
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2016-10-24
|
2016-11-24
|
CMS
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Consistency Check for T1_UK_RAL
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124478
|
Green
|
Less Urgent
|
In Progress
|
2016-11-18
|
2016-11-18
|
|
Jobs submitted via RAL WMS stuck in state READY forever and ever and ever
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122827
|
Green
|
Less Urgent
|
In Progress
|
2016-07-12
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2016-10-11
|
SNO+
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Disk area at RAL
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117683
|
Red
|
Less Urgent
|
On Hold
|
2015-11-18
|
2016-10-05
|
|
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
|
30/11/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
01/12/16 |
100 |
100 |
100 |
99 |
100 |
N/A |
100 |
Single SRM test failure: User timeout over
|
02/12/16 |
100 |
100 |
100 |
74 |
100 |
N/A |
100 |
Block of SRM test failures during the day (User timeout).
|
03/12/16 |
100 |
100 |
100 |
99 |
100 |
N/A |
100 |
Single SRM test failure: User timeout over
|
04/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
05/12/16 |
100 |
100 |
100 |
98 |
100 |
N/A |
100 |
Single SRM test failure: User timeout over
|
06/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
98 |
|