RAL Tier1 Operations Report for 10th May 2017
| Review of Issues during the week 3rd to 10th May 2017.
|
- There was a problem with one of the argus servers that was ongoing at the time of last week's meeting. This was resolved later that day although there problem led to a significant availability loss for CMS (it affected their CE tests).
- Following the upgrade of the Castor central services to version 2.1.16 yesterday (Tuesday 9th May) there was a problem bringing the CMS instance back which was resolved by the evening. However, there was also an entirely separate problem with xroot redirection for CMS. This caused the CMS CE SAM tests to fail. This problem was not picked up until this morning (Wednesday) when a restart of the appropraite services fixed it.
| Resolved Disk Server Issues
|
- GDSS793 (AtlasDataDisk - D1T0) was taken out of service on Friday 5th May with a double disk failure. It was retured to service on Monday (8th) after the first disk replacement had comleted rebuilding.
- GDSS818 (LHCbDst - D1T0) failed twice in this last week. The first time was in the early hours of 5th May. During that day its RAID card was swapped and it was returned to service that afternoon (read-only). It failed again during the following night. Following an intervention over the weekend the server was put back read-only on Monday (8th May) and will be drained out pending further investigation.
| Current operational status and issues
|
- On Friday 28th April there was a problem with the UPS for building R89. The UPS switched itself into "bypass" mode - which effectively means we have no UPS. We have run in this way since then. The cause was overheating of internal capacitors which failed. At the moment costs are being gathered for a way forward. In the current situation the diesel generator cannot be used either.
- We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities. CMS are also looking at file access perfromance and have turned off "lazy-download". This will be re-addresses once we have upgraded to Castor 2.1.16.
- LHCb Castor performance. This was a significant problem during LHCb strippong/merging campain in April. As for CMS Castor the next step is to upgrade to Castor 2.1.16.
| Ongoing Disk Server Issues
|
| Limits on concurrent batch system jobs.
|
| Notable Changes made since the last meeting.
|
- FTS3 "test" instance upgraded to 3.6.8
- Castor central services updated to Castor version 2.1.16-13.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-lhcb.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
11/05/2017 10:00
|
11/05/2017 16:00
|
6 hours
|
Downtime while upgrading LHCb Castor instance to 2.1.16
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
Pending - but not yet formally announced:
- Update Castor (including SRMs) to version 2.1.16. Central nameserver done. Current plan: LHCb stager on Thursday 11th May. Others to follow.
- Update Castor SRMs - CMS & GEN still to do. Problems seen with the SRM update mean these will wait until Castor 2.1.16 is rolled out.
Listing by category:
- Castor:
- Update SRMs to new version, including updating to SL6.
- Update Cator to version 2.1.16 (ongoing)
- Merge AtlasScratchDisk into larger Atlas disk pool.
- Networking
- Enable first services on production network with IPv6 now that the addressing scheme has been agreed. (Perfsonar already working over IPv6).
- Services
- Put argus systems behind a load balancer to improve resilience.
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-lhcb.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
09/05/2017 10:00
|
09/05/2017 12:22
|
2 hours and 22 minutes
|
Update central Castor services (including the nameserver component) and LHCb stager to version 2.1.16
|
| All Castor (except LHCb)
|
SCHEDULED
|
OUTAGE
|
09/05/2017 10:00
|
09/05/2017 12:21
|
2 hours and 21 minutes
|
Update central Castor services (including the nameserver component) to version 2.1.16
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 128180
|
Green
|
Urgent
|
In Progress
|
2017-05-05
|
2017-05-08
|
|
WLGC-IPv6 Tier-1 readiness
|
| 128068
|
Green
|
Urgent
|
On Hold
|
2017-05-04
|
2017-05-04
|
CMS
|
T1_UK_RAL, SAM tests failing
|
| 127968
|
Green
|
Less Urgent
|
In Progress
|
2017-04-27
|
2017-04-27
|
MICE
|
RAL castor: not able to list directories and copy to
|
| 127967
|
Green
|
Less Urgent
|
On Hold
|
2017-04-27
|
2017-04-28
|
MICE
|
Enabling pilot role for mice VO at RAL-LCG2
|
| 127916
|
Yellow
|
Alarm
|
In Progress
|
2017-04-25
|
2017-04-25
|
LHCb
|
RAL srm-s are down again for LHCb
|
| 127612
|
Red
|
Alarm
|
In Progress
|
2017-04-08
|
2017-05-09
|
LHCb
|
CEs at RAL not responding
|
| 127598
|
Green
|
Urgent
|
In Progress
|
2017-04-07
|
2017-04-07
|
CMS
|
UK XRootD Redirector
|
| 127597
|
Yellow
|
Urgent
|
Waiting for Reply
|
2017-04-07
|
2017-05-04
|
CMS
|
Check networking and xrootd RAL-CERN performance
|
| 127240
|
Amber
|
Urgent
|
In Progress
|
2017-03-21
|
2017-05-08
|
CMS
|
Staging Test at UK_RAL for Run2
|
| 124876
|
Red
|
Less Urgent
|
On Hold
|
2016-11-07
|
2017-01-01
|
OPS
|
[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
|
| 117683
|
Red
|
Less Urgent
|
On Hold
|
2015-11-18
|
2017-03-02
|
|
CASTOR at RAL not publishing GLUE 2.
|
Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 845); Atlas HC ECHO = Atlas ECHO (Template 841);CMS HC = CMS HammerCloud
| Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas ECHO |
Atlas HC |
Atlas HC ECHO |
CMS HC |
Comment
|
| 03/05/17 |
100 |
100 |
87 |
36 |
96 |
100 |
98 |
100 |
85 |
CMS: glexec test failures; Others SRM test failures.
|
| 04/05/17 |
100 |
100 |
94 |
100 |
96 |
100 |
98 |
99 |
93 |
SRM test failures.
|
| 05/05/17 |
100 |
100 |
96 |
100 |
100 |
100 |
100 |
100 |
100 |
SRM test failures on GET ("unknown error")
|
| 06/05/17 |
100 |
100 |
81 |
100 |
100 |
100 |
100 |
100 |
N/A |
SRM test failures on GET ("unknown error")
|
| 07/05/17 |
100 |
100 |
85 |
96 |
100 |
100 |
100 |
100 |
100 |
SRM test failures: Atlas - on GET ("unknown error"); CMS - Unable to issue PrepareToPut/Get request
|
| 08/05/17 |
100 |
100 |
98 |
100 |
100 |
100 |
100 |
100 |
N/A |
Single SRM test failure on GET ("unknown error")
|
| 09/05/17 |
100 |
100 |
77 |
55 |
87 |
100 |
90 |
98 |
100 |
All: Castor planned outage for a couple of hours. Atlas: Plus sporadic SRM test failures (unknown error); CMS CE tests failed owing to xroot redirection failing.
|
