RAL Tier1 Operations Report for 11th January 2017
Review of Issues during the week 4th to 11th January 2017.
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Overall it was a fairly quiet holiday time operationally:
- There was a failure of a Power Distribution Unit in a rack in the UPS room in the early hours of Friday 23rd December. Staff attended on site to get the power back. This mainly affected internal services (monitoring etc) - but also the Top BDIIs. This was the second time this PDU had given problems and it was swapped out during Friday morning.
- We have had load issues on the CMS Castor instance throughout the holiday period which has led to repeated SAM test failures.
Resolved Disk Server Issues
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- GDSS671 (AliceDisk - D1T0) failed on Saturday (17th Dec) with a read-only filesystem. Three drives were replaced and the server was returned to service on the 22nd 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.
Ongoing Disk Server Issues
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- GDSS665 (lhcbRawRdst - D0T1) failed on Saturday 31st Dec). Investigations are ongoing.
Notable Changes made since the last meeting.
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Service
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Scheduled?
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Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
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Castor CMS instance
|
SCHEDULED
|
OUTAGE
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31/01/2017 10:00
|
31/01/2017 16:00
|
6 hours
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Castor 2.1.15 Upgrade. Only affecting CMS instance. (CMS stager component being upgraded).
|
Castor GEN instance
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SCHEDULED
|
OUTAGE
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26/01/2017 10:00
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26/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting GEN instance. (GEN stager component being upgraded).
|
Castor Atlas instance
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SCHEDULED
|
OUTAGE
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24/01/2017 10:00
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24/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting Atlas instance. (Atlas stager component being upgraded).
|
Castor LHCb instance
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SCHEDULED
|
OUTAGE
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17/01/2017 10:00
|
17/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting LHCb instance. (LHCb stager component being upgraded).
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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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Pending - but not yet formally announced:
- Merge AtlasScratchDisk into larger Atlas disk pool.
Listing by category:
- Castor:
- Update to Castor version 2.1.15. Dates announced via GOC DB for early 2017.
- 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?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
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All Castor storage (All SRMs)
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SCHEDULED
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OUTAGE
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10/01/2017 10:00
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10/01/2017 14:03
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4 hours and 3 minutes
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Castor 2.1.15 Upgrade. Upgrade of Nameserver component. All instances affected.
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gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
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SCHEDULED
|
OUTAGE
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05/01/2017 10:00
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06/01/2017 15:00
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1 day, 5 hours
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ECHO Re-install
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All Castor storage (All SRMs)
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SCHEDULED
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OUTAGE
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05/01/2017 09:30
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05/01/2017 11:54
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2 hours and 24 minutes
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Outage of Castor Storage System for patching
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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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125856
|
Green
|
Top Piority
|
In Progress
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2017-01-06
|
2016-01-10
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lhcB
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Permission denied for some files
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125480
|
Green
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Less Urgent
|
On Hold
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2016-12-09
|
2016-12-21
|
|
total Physical and Logical CPUs values
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125157
|
Green
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Less Urgent
|
In Progress
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2016-11-24
|
2017-01-03
|
|
Creation of a repository within the EGI CVMFS infrastructure
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124876
|
Amber
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Less Urgent
|
On Hold
|
2016-11-07
|
2017-01-01
|
OPS
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[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
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117683
|
Red
|
Less Urgent
|
On Hold
|
2015-11-18
|
2016-12-07
|
|
CASTOR at RAL not publishing GLUE 2. We looked at this as planned in December (report).
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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
|
04/01/17 |
100 |
72 |
100 |
93 |
100 |
N/A |
100 |
Alice: Internal Alice problem; CMS: SRM test failures - User timeout
|
05/01/17 |
89.6 |
35 |
90 |
82 |
90 |
N/A |
100 |
Castor outage for patching. ; Alice: Internal Alice problem.; CMS: SRM test failures - User timeout
|
06/01/17 |
100 |
100 |
100 |
54 |
100 |
N/A |
100 |
SRM test failures - User timeout
|
07/01/17 |
100 |
100 |
100 |
95 |
100 |
N/A |
100 |
SRM test failures - User timeout
|
08/01/17 |
100 |
100 |
100 |
84 |
100 |
N/A |
100 |
SRM test failures - User timeout
|
09/01/17 |
100 |
100 |
100 |
95 |
100 |
N/A |
100 |
SRM test failures - User timeout
|
10/01/17 |
82.3 |
100 |
83 |
74 |
83 |
N/A |
N/A |
Castor upgrade (nameserver to 2.1.15). CMS: SRM test failures - User timeout
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- It was reported that CMS are seeing poor CMS efficiencies across all Tier1s.
- We had to connect to Vidyo using the phone link. Will try and get Vidyo client fixed in our meeting room.