RAL Tier1 Operations Report for 5th August 2015
| Review of Issues during the week 29th July and 5th August 2015.
|
- There have been further problems with network connectivity caused by a failure of our secondary router - which at the time was our only router. The first outage was on Tuesday (28th July) as reported last week. At the time of last week's meeting another was ongoing - which ended up lasting around five hours and was caused by problems both in getting the router back up and then a failure to propagate routing information via the RIP protocol. There was then a third outage, lasting around an hour, on Sunday morning (2nd August). These preceded a long-planned scheduled intervention on 4th August when an engineer from the router vendor company was present. As a result of this intervention and associated discussions we believe these router problems are now largely understood and we are again running with a resilient pair of network routers.
| Resolved Disk Server Issues
|
| Current operational status and issues
|
- The post mortem review of the network incident on the 8th April is being finalised.
- The intermittent, low-level, load-related packet loss over the OPN to CERN is still being tracked.
- There are some on-going issues for CMS. These are a problem with the Xroot (AAA) redirection accessing Castor; Slow file open times using Xroot; and poor batch job efficiencies.
| Ongoing Disk Server Issues
|
| Notable Changes made since the last meeting.
|
- During yesterday's intervention on the Tier1 routers a number of problems were understood. We again have a resilient pair of routers which are running the latest production firmware and the RIP protocol is enabled.
- The test of the updated worker node configuration (with grid middleware delivered via CVMFS) continues on a one whole batch of Worker Nodes. We now propose continuing with the rollout to more worker nodes. (There is a complication in that some OS patches are being applied to these nodes now - and that will also we tested before extending the rollout).
- Investigative work into the ongoing issues for CMS Castor. This included putting the CMS xroot reads through the Castor scheduler again.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
04/08/2015 15:00
|
05/08/2015 15:00
|
24 hours
|
Warning on Site following investigations of problem with network router.
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- Upgrade of Castor disk servers to SL6. We plan to do this during the second part of August (17-28). Rollout plan to be discussed.
- Upgrade of the Oracle databases behind Castor to version 11.2.0.4. This is a multi-step intervention. Whilst we need to confirm exact dates we are looking at the following days in September:
- Tuesday 8th: day's Outage for Atlas & GEN.
- Tuesday 15th: at risk on Atlas & GEN.
- Thursday 17th: day's Outage for ALL instances.
- Tuesday 22nd: day's at risk for ALL instances
- Thursday 24th: Half day outage for ALL instances.
- Extending the rollout of the new worker node configuration.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Update to Oracle 11.2.0.4. This will affect all services that use Oracle databases: Castor, Atlas Frontier (LFC done)
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update the Oracle databases behind Castor to version 11.2.0.4. Will require some downtimes (See above)
- Update disk servers to SL6.
- Update to Castor version 2.1.15.
- Networking:
- Increase bandwidth of the link from the Tier1 into the RAL internal site network to 40Gbit.
- Make routing changes to allow the removal of the UKLight Router.
- Cabling/switch changes to the network in the UPS room to improve resilience.
- Fabric
- Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
04/08/2015 15:00
|
05/08/2015 15:00
|
24 hours
|
Warning on Site following investigations of problem with network router.
|
| Whole site
|
SCHEDULED
|
OUTAGE
|
04/08/2015 08:30
|
04/08/2015 15:00
|
6 hours and 30 minutes
|
Site Outage during investigation of problem with network router.
|
| Whole site
|
UNSCHEDULED
|
OUTAGE
|
02/08/2015 10:00
|
02/08/2015 11:00
|
1 hour
|
Site was inaccessible due to a problem with the network router
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
29/07/2015 16:30
|
30/07/2015 16:30
|
24 hours
|
Problems on the network have been fixed. Putting whole site AT-RISK for next 24 hours.
|
| Whole site
|
UNSCHEDULED
|
OUTAGE
|
29/07/2015 13:10
|
29/07/2015 16:51
|
3 hours and 41 minutes
|
Outage while we work on network problems
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
29/07/2015 11:10
|
29/07/2015 13:10
|
2 hours
|
Outage while we investigate network problems
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 115434
|
Green
|
Less Urgent
|
In Progress
|
2015-08-03
|
2015-08-03
|
SNO+
|
glite-wms-job-status warning
|
| 115417
|
Green
|
Very Urgent
|
Waiting Reply
|
2015-08-02
|
2015-08-03
|
LHCb
|
CVMS problem at RAL-LCG2
|
| 115387
|
Green
|
Less Urgent
|
In Progress
|
2015-08-03
|
2015-08-03
|
SNO+
|
XRootD for SNO+ from RAL
|
| 115290
|
Green
|
Less Urgent
|
On Hold
|
2015-07-28
|
2015-07-29
|
|
FTS3@RAL: missing proper host names in subjectAltName of FTS agent nodes
|
| 113836
|
Amber
|
Less Urgent
|
In Progress
|
2015-05-20
|
2015-06-24
|
|
GLUE 1 vs GLUE 2 mismatch in published queues
|
| 108944
|
Red
|
Less Urgent
|
In Progress
|
2014-10-01
|
2015-07-17
|
CMS
|
AAA access test failing at T1_UK_RAL
|
Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 508); CMS HC = CMS HammerCloud
| Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas HC |
CMS HC |
Comment
|
| 29/07/15 |
77.9 |
78.0 |
78.0 |
79.0 |
73.0 |
97 |
100 |
Problem with Tier1 network router.
|
| 30/07/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 31/07/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 01/08/15 |
97.4 |
100 |
100 |
100 |
100 |
100 |
99 |
SRM tests failed on Castor GEN instance.
|
| 02/07/15 |
97.3 |
100 |
95.0 |
95.0 |
97.0 |
67 |
96 |
Problem with Tier1 network router.
|
| 03/08/15 |
100 |
100 |
100 |
94.0 |
96.0 |
93 |
97 |
CMS: ARC CE test failures; LHCb: SRM test failure.
|
| 04/07/15 |
72.9 |
73.0 |
73.0 |
73.0 |
73.0 |
100 |
56 |
Planned intervention on the Tier1 Network Routers.
|
