RAL Tier1 Operations Report for 30th August 2017
| Review of Issues during the week 23rd to 30th August 2017.
|
- There have been problems with Echo since last weekend. Although now resolved there was a loss of around 22,000 Atlas files (of which 3285 files were unique). One CEPH "placement group" was lost. This is most likely due to some low level disk errors not being handled cleanly. While the problem was ongoing it also revealed a problem with the Echo gateways (including those on the worker nodes) which created many threads - blocking activity.
- Four files were reported lost to CMS from a tape. During a CMS mass recall the monitoring noted that one tape was generating errors and causing tape drives to go down. The tape was put into repack. After various attempts at repacking and reading files direct from tape, there were four files left unreadable.
| Resolved Disk Server Issues
|
- GDSS753 (AtlasDataDisk - D1T0) failed in the early evening of Wednesday 23rd Aug. It was returned to serice on Friday morning (25th). Two disk drives were replaced.
| 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. CMS are also looking at file access performance and have turned off "lazy-download". The CMS SRM SAM test success rate has improved since the Castor 2.1.16 upgrade on the 25th May, although is still not 100%. Our investigations are ongoing.
- There is a problem on the site firewall which is causing problems for some specific data flows. Discussions have been taking place with the vendor. This is having an effect on our data that flows through the firewall (such as to/from worker nodes).
| Ongoing Disk Server Issues
|
| Limits on concurrent batch system jobs.
|
| Notable Changes made since the last meeting.
|
- Further services migrated from our old Windows HyperV2008 infrastructure to hypervisors running HyperV2012 as we prepare to fully decommission the HyperV2008 systems.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-superb.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
20/07/2017 16:00
|
30/08/2017 13:00
|
40 days, 21 hours
|
SuperB no longer supported on Castor storage. Retiring endpoint.
|
| srm-hone.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
20/07/2017 16:00
|
30/08/2017 13:00
|
40 days, 21 hours
|
H1 no longer supported on Castor storage. Retiring endpoint.
|
| 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:
- Upgrade the FTS3 service to a version that will no longer support the SOAP interface. The SOAP interface was disabled on Monday (17th July).
- Re-distribute the data in Echo onto the 2015 capacity hardware. (Ongoing)
Listing by category:
- Castor:
- Move to generic Castor headnodes.
- Echo:
- Re-distribute the data in Echo onto the remaining 2015 capacity hardware.
- Networking
- Extend the number of services on the production network with IPv6 dual stack. (Done for Perfsonar, all squids and the CVMFS Stratum-1 servers).
- Services
- The production FTS will be updated now the requirement to support the deprecated SOAP interface has been removed.
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
|
UNSCHEDULED
|
OUTAGE
|
25/08/2017 12:00
|
25/08/2017 15:00
|
3 hours
|
continued problems with Echo instance at RAL
|
| gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
|
UNSCHEDULED
|
OUTAGE
|
24/08/2017 11:23
|
25/08/2017 12:00
|
1 day, 37 minutes
|
Ceph team need to take the Echo service offline while dealing with ongoing issues
|
| gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
|
UNSCHEDULED
|
WARNING
|
23/08/2017 11:00
|
25/08/2017 16:00
|
2 days, 5 hours
|
Ongoing problems with Ceph, service is still degraded
|
| gridftp.echo.stfc.ac.uk, s3.echo.stfc.ac.uk, xrootd.echo.stfc.ac.uk,
|
UNSCHEDULED
|
WARNING
|
22/08/2017 10:03
|
23/08/2017 10:00
|
23 hours and 57 minutes
|
Ongoing problems with Ceph, service is degraded
|
| srm-hone.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
20/07/2017 16:00
|
30/08/2017 13:00
|
40 days, 21 hours
|
H1 no longer supported on Castor storage. Retiring endpoint.
|
| srm-superb.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
20/07/2017 16:00
|
30/08/2017 13:00
|
40 days, 21 hours
|
SuperB no longer supported on Castor storage. Retiring endpoint.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 130207
|
Green
|
Urgent
|
In Progress
|
2017-08-24
|
2017-08-25
|
MICE
|
Timeouts when copying MICE reco data to CASTOR
|
| 130197
|
Green
|
Urgent
|
Waiting for Reply
|
2017-08-23
|
2017-08-24
|
SNO+
|
LFC registration failing
|
| 130193
|
Green
|
Urgent
|
In Progress
|
2017-08-23
|
2017-08-24
|
CMS
|
Staging from RAL tape systems
|
| 128991
|
Green
|
Less Urgent
|
On Hold
|
2017-06-16
|
2017-08-24
|
Solid
|
solidexperiment.org CASTOR tape support
|
| 127597
|
Red
|
Urgent
|
On Hold
|
2017-04-07
|
2017-06-14
|
CMS
|
Check networking and xrootd RAL-CERN performance
|
| 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
|
2017-07-06
|
|
CASTOR at RAL not publishing GLUE 2.
|
| Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas Echo |
Comment
|
| 23/08/17 |
100 |
100 |
98 |
100 |
100 |
100 |
One SRM test failure (Unable to issue PrepareToPut request to Castor).
|
| 24/08/17 |
96.9 |
100 |
100 |
100 |
100 |
100 |
|
| 25/08/17 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 26/08/17 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 27/08/17 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 28/08/17 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 29/08/17 |
100 |
100 |
100 |
100 |
100 |
100 |
|
Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 845); Atlas HC Echo = Atlas Echo (Template 841);CMS HC = CMS HammerCloud
| Day |
Atlas HC |
Atlas HC Echo |
CMS HC |
Comment
|
| 23/08/17 |
100 |
29 |
99 |
|
| 24/08/17 |
100 |
0 |
99 |
|
| 25/08/17 |
100 |
57 |
100 |
|
| 26/08/17 |
100 |
100 |
100 |
|
| 27/08/17 |
100 |
100 |
100 |
|
| 28/08/17 |
100 |
100 |
100 |
|
| 29/08/17 |
100 |
99 |
100 |
|
