RAL Tier1 Operations Report for 12th April2017
| Review of Issues during the week 5th to 12th April 2017.
|
- LHCb Castor instance has been running with problems all this last week. Initially it appeared the new SRM version was causing a bottleneck. This was fixed but it then appears the stager was also struggling. Work has been ongoing to resolve this.
- Some batch job submission errors have been seen by CMS and LHCb. These are not yet understood. ?? Ongoing
- Over the weekend there were problems with the Atlas Frontier systems. Lyon were also affected.
- On Monday problems were reported on one of the ARC CEs (AC-CE4) and its services were restarted.
| Resolved Disk Server Issues
|
- GDSS780 (LHCbDst - D1T0) had failed on Sunday (26th) and was put back in service the following day. However, it crashed again on the 29th March. Following that its disks were swapped into new chassis and that was brought into service (as GDSS780) on Monday 3rd April.
- GDSS733 (LHCbDst - D1T0) was taken out of service on Thursday 30th March. The server seemed to be behaving badly in Castor and was taken out of production and checked over by Fabric Team although nothing was found. It was returned to service the following afternoon.
| Current operational status and issues
|
- We are still seeing a rate of failures of the CMS SAM tests against the SRM. These are affecting our (CMS) availabilities but the level of failures is reduced as compared to a few weeks ago.
| Ongoing Disk Server Issues
|
- gdss673 (LHCb-Tape) was removed from production this morning (05/04/2017) due to it having a double disk failure.
| Limits on concurrent batch system jobs.
|
- Atlas Pilot (Analysis) 1500
- CMS Multicore 460
- LHCb 1000
| Notable Changes made since the last meeting.
|
- Increased limit on number of CMS multicore jobs from 460 to 550 due to increased pledge for 2017.
- Out of Hours cover for the CEPH ECHO service is being piloted.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| lcgwms04.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
12/04/2017 09:05
|
18/04/2017 12:00
|
6 days, 2 hours and 55 minutes
|
server migration
|
| 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 SRMs - CMS & GEN still to do. This is awaiting a full understanding of the problem seen with LHCb.
- Chiller replacement - work ongoing.
- Merge AtlasScratchDisk into larger Atlas disk pool.
Listing by category:
- Castor:
- Update SRMs to new version, including updating to SL6.
- Bring some newer disk servers ('14 generation) into service, replacing some older ('12 generation) servers.
- Networking
- Enable first services on production network with IPv6 once addressing scheme agreed.
- Infrastructure:
- Two of the chillers supplying the air-conditioning for the R89 machine room are being replaced.
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| lcgwms04.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
12/04/2017 09:05
|
18/04/2017 12:00
|
6 days, 2 hours and 55 minutes
|
server migration
|
| srm-lhcb.gridpp.rl.ac.uk
|
UNSCHEDULED
|
OUTAGE
|
09/04/2017 12:00
|
10/04/2017 12:00
|
24 hours
|
Problems with LHCb transfers
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 127388
|
Green
|
Less urgent
|
In Progress
|
2017-03-29
|
2017-04-03
|
LHCb
|
[FATAL] Connection error for some file
|
| 127240
|
Green
|
Urgent
|
In Progress
|
2017-03-21
|
2017-03-27
|
CMS
|
Staging Test at UK_RAL for Run2
|
| 126905
|
Green
|
Less Urgent
|
Waiting Reply
|
2017-03-02
|
2017-04-03
|
solid
|
finish commissioning cvmfs server for solidexperiment.org
|
| 126184
|
Amber
|
Less Urgent
|
In Progress
|
2017-01-26
|
2017-02-07
|
Atlas
|
Request of inputs for new sites monitoring
|
| 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 HC |
Atlas HC ECHO |
CMS HC |
Comment
|
| 29/03/17 |
100 |
100 |
100 |
97 |
83 |
100 |
99 |
100 |
SRM test failures
|
| 30/03/17 |
100 |
100 |
100 |
100 |
88 |
100 |
100 |
100 |
SRM test failures
|
| 31/03/17 |
100 |
100 |
100 |
98 |
50 |
96 |
100 |
100 |
SRM test failures
|
| 01/04/17 |
100 |
100 |
67 |
100 |
79 |
100 |
100 |
100 |
Atlas: Missing data; LHCb: SRM test failures
|
| 02/034/17 |
100 |
100 |
100 |
98 |
100 |
100 |
89 |
100 |
SRM test failures
|
| 03/04/17 |
100 |
100 |
100 |
97 |
82 |
98 |
94 |
99 |
SRM test failures
|
| 05/04/17 |
100 |
100 |
100 |
100 |
88 |
100 |
100 |
100 |
SRM Test failures.
|
| 06/04/17 |
100 |
100 |
100 |
99 |
84 |
100 |
100 |
100 |
SRM test failures for both CMS and LHCb.
|
| 07/04/17 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 08/04/17 |
100 |
96 |
88 |
75 |
94 |
100 |
100 |
100 |
A hypervisor failure led to problems for one of the CEs and argus.
|
| 09/04/17 |
100 |
100 |
100 |
45 |
88 |
100 |
100 |
100 |
CMS: Problem with CMS Castor (transfer manager problems); LHCb - SRM test failures.
|
| 10/04/17 |
100 |
100 |
100 |
60 |
100 |
100 |
100 |
100 |
CMS: Ongoing problem with CMS Castor (above) fixed during morning.
|
| 11/04/17 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
