RAL Tier1 Operations Report for 7th June 2017
| Review of Issues during the week 31st May to 7th June 2017.
|
- Following the upgrade of the Castor GEN instance last Wednesday (31st) there was a problem with the 'OPS' tests against the instance that was fixed the following day. No other problems were encountered after the upgrade.
- There was a problem with the CMS Castor instance on Friday (2nd June) caused by blocking sessions in the database.
- A problem of ARP poisoning on the Tier1 network is affecting some monitoring used by Echo. The cause of this is now believed to be understood and the fix (a setting change in the OPN Router) has been applied.
- We are seeing a high rate of reported disk problems on the OCF '14 batch of disk servers. In some of the cases the vendor finds no fault in the drives that have been removed. We plan to update the RAID card firmware in these systems following testing of the latest version.
| Resolved Disk Server Issues
|
- GDSS658 (AtlasScratchDisk - D1T0) crashed last Tuesday (30th May). It was returned to service on Thursday (1st Jue). Two disks were replaced as the testing flushed these out as problematic.
- GDSS793 (AtlasDataDisk - D1T0) was taken out of service on Monday (5th June) yesterday as two disk drives in the server were faulty. Following replacement and rebuilding of the first it was returned to service yesterday (6th June), initially read-only.
| 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%. It is still planned to re-visit this issue now Castor has been upgraded.
- There is a problem on the site firewall which is causing problems for some specific data flows. This was being investigated in connection with videoconferencing problems. It is expected that 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.
|
- All CEs now migrated to use the load balancers in front of the argus service.
| 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:
- Increase OPN link to CERN from 2*10Gbit to 3*10Gbit links (planned for 14th June).
- Firmware updates in OCF 14 disk servers.
Listing by category:
- Castor:
- Move to generic Castor headnodes.
- Merge AtlasScratchDisk into larger Atlas disk pool.
- Networking
- Increase OPN link to CERN from 2*10Gbit to 3*10Gbit links.
- Enable first services on production network with IPv6 now that the addressing scheme has been agreed. (Perfsonar already working over IPv6).
- Services
- The production FTS needs updating. This will no longer support the soap interface. (The "test" FTS , used by Atlas, has already been upgraded.)
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Castor GEN instace (srm-alice, srm-biomed, srm-dteam, srm-ilc, srm-mice, srm-na62, srm-pheno, srm-snoplus, srm-t2k)
|
SCHEDULED
|
OUTAGE
|
31/05/2017 10:00
|
31/05/2017 12:56
|
5 hours
|
Upgrade of Castor GEN instance to version 2.1.16.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 127967
|
Green
|
Less Urgent
|
In Progress
|
2017-04-27
|
2017-06-06
|
MICE
|
Enabling pilot role for mice VO at RAL-LCG2
|
| 127612
|
Red
|
Alarm
|
In Progress
|
2017-04-08
|
2017-05-19
|
LHCb
|
CEs at RAL not responding
|
| 127597
|
Amber
|
Urgent
|
In Progress
|
2017-04-07
|
2017-05-16
|
CMS
|
Check networking and xrootd RAL-CERN performance
|
| 127240
|
Red
|
Urgent
|
In Progress
|
2017-03-21
|
2017-05-15
|
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
|
2017-05-10
|
|
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
|
| 31/05/17 |
100 |
100 |
100 |
89 |
100 |
100 |
100 |
100 |
93 |
CMS: Some ‘User timeout over’ on the SRM tests. There were a few CE test failures too, with ‘Job held’ and ‘unable to open remote xrootd ..’ errors.
|
| 01/06/17 |
100 |
100 |
100 |
97 |
100 |
100 |
100 |
100 |
N/A |
CMS: Some SRM failures with an error of ‘ERROR: DESTINATION SRM_PUT_TURL error on the turl request : [SE][StatusOfPutRequest][SRM_FAILURE] Unable to issue PrepareToPut request to Castor’.
|
| 02/06/17 |
100 |
100 |
100 |
92 |
100 |
100 |
100 |
100 |
100 |
CMS: Some instances of “Unable to issue PrepareToPut request to Castor”
|
| 03/06/17 |
100 |
100 |
100 |
90 |
100 |
100 |
100 |
98 |
N/A |
CMS: Some user timeout errors on SRM tests.
|
| 04/06/17 |
100 |
100 |
100 |
97 |
100 |
100 |
100 |
100 |
N/A |
CMS: Some user timeout errors on SRM tests.
|
| 05/06/17 |
100 |
100 |
100 |
94 |
100 |
100 |
100 |
100 |
N/A |
CMS: SRM test failures. “User timeout” – some on Put, some on Get.
|
| 06/06/17 |
100 |
100 |
100 |
92 |
100 |
100 |
100 |
100 |
99 |
CMS: SRM test failures. “User timeout” – some on Put, some on Get.
|
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