RAL Tier1 Operations Report for 29th March 2017
| Review of Issues during the week 22nd to 29th March 2017.
|
- There was a problem with the Atlas Castor instance on the evening of Wednesday 15th Mar. The oncall was contacted and Castor services restarted to resolve the problem. The cause was a known bug that causes exhaustion of a particular database resource.
- A crash of one of the five hypervisors in the Microsoft Hyper-V high availability cluster caused a number of VMs to reboot overnight Thursday-Friday (16-17 Mar). A knock-on effect was that one of the argus servers did not start cleanly and this affected CMS glexec tests.
- We have an ongoing problem with the SRM SAM tests for Atlas which are failing a lot of the time. We have confirmed this is not affecting Atlas operationally it is just the tests that fails. We still have a GGUS ticket open with Atlas as the test appears to be problematic.
- There has been a large backlog of Atlas transfers for RAL queued in the FTS. The high number is because Atlas are doing reprocessing and pulling data back from tape. This high request rate is seen at other Tier1s but we are coping worse than other sites.
| Resolved Disk Server Issues
|
| 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
|
| Limits on concurrent batch system jobs.
|
- Atlas Pilot (Analysis) 1500
- CMS Multicore 460
| Notable Changes made since the last meeting.
|
- Last week nine of the ’14 generation disk servers – each 100TB - were deployed into AtlasDataDisk. (These are from the batch that was used as CEPH test servers).
- Work ongoing on replacing two of the chillers.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Castor CMS and GEN instances (SRMs)
|
SCHEDULED
|
WARNING
|
30/03/2017 10:00
|
30/03/2017 16:30
|
6 hours and 30 minutes
|
Upgrading SRM software to 2.1.16
|
| srm-atlas.gridpp.rl.ac.uk,
|
UNSCHEDULED
|
WARNING
|
29/03/2017 09:00
|
29/03/2017 16:30
|
7 hours and 30 minutes
|
upgrading Atlas srm software 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 SRMs starting with LHCb. (Announced for 23rd March.)
- 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.
- Databases
- Removal of "asmlib" layer on Oracle database nodes. (Ongoing)
- 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 will be replaced.
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-atlas.gridpp.rl.ac.uk,
|
UNSCHEDULED
|
WARNING
|
29/03/2017 09:00
|
29/03/2017 16:30
|
7 hours and 30 minutes
|
upgrading Atlas srm software to 2.1.16
|
| srm-atlas.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
28/03/2017 11:00
|
28/03/2017 18:00
|
7 hours
|
Risk to Atlas SRM service while we upgrade SRM to 2,1,16
|
| srm-lhcb.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
23/03/2017 11:00
|
23/03/2017 16:02
|
5 hours and 2 minutes
|
Upgrade of Cator SRMs for LHCb to version 2.1.16-10
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 127240
|
Green
|
Urgent
|
In Progress
|
2017-03-21
|
2017-03-21
|
CMS
|
Staging Test at UK_RAL for Run2
|
| 127185
|
Green
|
Urgent
|
In Progress
|
2017-03-17
|
2017-03-17
|
|
WLGC-IPv6 readiness
|
| 126905
|
Green
|
Less Urgent
|
Waiting Reply
|
2017-03-02
|
2017-03-21
|
solid
|
finish commissioning cvmfs server for solidexperiment.org
|
| 126184
|
Yellow
|
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 842);CMS HC = CMS HammerCloud
| Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas HC |
Atlas HC ECHO |
CMS HC |
Comment
|
| 22/03/17 |
100 |
100 |
100 |
99 |
100 |
100 |
99 |
97 |
SRM test failure on GET (User timeout).
|
| 23/03/17 |
100 |
100 |
100 |
98 |
79 |
100 |
100 |
100 |
CMS: SRM test failure on GET (User timeout); LHCb:SRM upgrade.
|
| 24/03/17 |
100 |
100 |
100 |
98 |
100 |
100 |
100 |
100 |
SRM test failure on GET (User timeout).
|
| 25/03/17 |
100 |
100 |
100 |
98 |
96 |
100 |
100 |
100 |
CMS: SRM test failures on GET (User timeout); LHCb: Single SRM test failure - couldn't contact SRM.
|
| 26/03/17 |
100 |
100 |
100 |
97 |
100 |
100 |
100 |
100 |
SRM test failure on GET (User timeout).
|
| 27/03/17 |
100 |
100 |
98 |
92 |
96 |
98 |
94 |
100 |
Atlas: Single SRM test failure: "error 500 Command failed."; LHCb- Single SRM test failure on List (SRM_FILE_BUSY); CMS: Mainly SRM timeouts - but some CE job submission issues.
|
| 28/03/17 |
100 |
100 |
100 |
97 |
100 |
95 |
100 |
100 |
Some SRM test timeouts.
|
