RAL Tier1 Operations Report for 14th December 2016
| Review of Issues during the week 7th to 14th December 2016.
|
- There was a problem with the Atlas Frontier service on Wednesday (7th). The excess load caused by particular Atlas user. The services on the squid systems needed several restarts through the day and evening.
- Since yesterday (Tuesday 13th Dec) we are seeing high load on CMSTape in Castor - and are failing SAM tests as a result.
| Resolved Disk Server Issues
|
- GDSS657 (lhcbRawRdst - D0T1) failed on Saturday morning, 10th Dec. It was put back read-only later that day and the eight files awaiting migration to tape were flushed off. The server was then taken down on Monday (12th) for further investigation - which was transparent to the VO. No faults were found and the server was returned to service yesterday (13th Dec.)
| Current operational status and issues
|
- 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.
- We had been reporting a problem with intermittent, low-level, load-related packet loss over external connections. We have been tracking this - particularly since the replacement of the UKLight router. The rate of packet loss has reduced and we now conclude there is no longer a significant problem. Loss rates seen are comparable with other sites.
| Ongoing Disk Server Issues
|
| Notable Changes made since the last meeting.
|
- On Monday (5th Dec) the bulk of the HPE Worker Nodes (the second tranche of last year's procurement) were reinstalled with SL6 and put into production. This follows a period of testing with another configuration in readiness for CEPH deployment. (This item overdue from last week's report).
- On Thursday (8th Dec) The small LhcbUser disk pool was merged into the larger LhcbDst pool.
- FTS Database adjustments requested by ATLAS
- (Ongoing at time of meeting: Firmware updates of RAID cards on Clustervision '13 batch of disk servers.)
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Castor CMS instance
|
SCHEDULED
|
OUTAGE
|
31/01/2017 10:00
|
31/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting CMS instance. (CMS stager component being upgraded).
|
| Castor GEN instance
|
SCHEDULED
|
OUTAGE
|
26/01/2017 10:00
|
26/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting GEN instance. (GEN stager component being upgraded).
|
| Castor Atlas instance
|
SCHEDULED
|
OUTAGE
|
24/01/2017 10:00
|
24/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Only affecting Atlas instance. (Atlas stager component being upgraded).
|
| Castor LHCb instance
|
SCHEDULED
|
OUTAGE
|
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).
|
| All Castor (all SRM endpoints)
|
SCHEDULED
|
OUTAGE
|
10/01/2017 10:00
|
10/01/2017 16:00
|
6 hours
|
Castor 2.1.15 Upgrade. Upgrade of Nameserver component. All instances affected.
|
| gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
|
SCHEDULED
|
OUTAGE
|
15/12/2016 09:00
|
15/12/2016 17:00
|
8 hours
|
Re-install of Echo Cluster
|
| srm-atlas.gridpp.rl.ac.uk, srm-cms-disk.gridpp.rl.ac.uk, srm-lhcb.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
14/12/2016 10:00
|
14/12/2016 17:00
|
7 hours
|
Warning while some disk servers have rolling firmware updates and are rebooted. Temporary loss of access to files.
|
| 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:
- 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.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-atlas.gridpp.rl.ac.uk, srm-cms-disk.gridpp.rl.ac.uk, srm-lhcb.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
14/12/2016 10:00
|
14/12/2016 17:00
|
7 hours
|
Warning while some disk servers have rolling firmware updates and are rebooted. Temporary loss of access to files.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 125553
|
Green
|
Urgent
|
In Progress
|
2016-12-13
|
2016-12-13
|
CMS
|
Transfers failing from T1_UK_RAL_Buffer
|
| 125551
|
Green
|
Urgent
|
In Progress
|
2016-12-13
|
2016-12-13
|
CMS
|
T1_UK_RAL SAM3_SRM Critical > 2h
|
| 125480
|
Green
|
Less Urgent
|
In Progress
|
2016-12-09
|
2016-12-12
|
|
total Physical and Logical CPUs values
|
| 125157
|
Green
|
Less Urgent
|
In Progress
|
2016-11-24
|
2016-12-07
|
|
Creation of a repository within the EGI CVMFS infrastructure
|
| 124876
|
Green
|
Less Urgent
|
On Hold
|
2016-11-07
|
2016-11-21
|
OPS
|
[Rod Dashboard] Issue detected : hr.srce.GridFTP-Transfer-ops@gridftp.echo.stfc.ac.uk
|
| 124606
|
Red
|
Top Priority
|
Waiting for Reply
|
2016-10-24
|
2016-12-09
|
CMS
|
Consistency Check for T1_UK_RAL
|
| 124478
|
Green
|
Less Urgent
|
In Progress
|
2016-11-18
|
2016-12-13
|
NA62
|
Jobs submitted via RAL WMS stuck in state READY forever and ever and ever
|
| 117683
|
Red
|
Less Urgent
|
On Hold
|
2015-11-18
|
2016-12-07
|
|
CASTOR at RAL not publishing GLUE 2. Plan to revisit week starting 19th.
|
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
|
| 07/12/16 |
100 |
100 |
100 |
98 |
100 |
N/A |
100 |
Single SRM test failure: User timeout over
|
| 08/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 09/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 10/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 11/12/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 12/12/16 |
100 |
100 |
100 |
97 |
100 |
N/A |
100 |
Some user timeout failures on SRM tests.
|
| 13/12/16 |
100 |
100 |
100 |
47 |
100 |
N/A |
100 |
Load problem on CMS_Tape causing multiple test failures.
|
- The meeting did not take place as there were no VO representatives present.
