RAL Tier1 Operations Report for 12th August 2015
Review of Issues during the week 29th July and 5th August 2015.
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- There was a site network outage on Saturday 8th August. The Tier1 was affected from approx 07:30 until 10:00. The issue was resolved when a member of the network team came on site and re-seated a card in a router.
Resolved Disk Server Issues
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Current operational status and issues
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- 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
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- gdss720 (part of ATLASDATADISK) crashed on Tuesday 11th. The machine is currently being drained so the fabric team can replace some components.
Notable Changes made since the last meeting.
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- Deployed changes to remove glite-CLUSTER node from information system and shutdown cream-ce01 and cream-ce02.
- Atlas have transferred a share of their FTS service back to RAL.
- The test of the updated worker node configuration (with grid middleware delivered via CVMFS) continues on a one whole batch of Worker Nodes. We are now draining a second batch of worker nodes.
- Investigative work into the ongoing issues for CMS Castor. We have now changed the I/O scheduler on the disk servers.
Advanced warning for other interventions
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The following items are being discussed and are still to be formally scheduled and announced.
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- 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.
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Service
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Scheduled?
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Outage/At Risk
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Start
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End
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Duration
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Reason
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Whole site
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UNSCHEDULED
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WARNING
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04/08/2015 15:00
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05/08/2015 15:00
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24 hours
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Warning on Site following investigations of problem with network router.
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Open GGUS Tickets (Snapshot during morning of meeting)
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GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
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115573
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Green
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Urgent
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In progress
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2015-08-07
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2015-08-11
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CMS
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T1_UK_RAL Consistency Check (August 2015)
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115434
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Green
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Less Urgent
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waiting for reply
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2015-08-03
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2015-08-07
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SNO+
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glite-wms-job-status warning
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115387
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Green
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Less Urgent
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In Progress
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2015-08-03
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2015-08-11
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SNO+
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XRootD for SNO+ from RAL
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115290
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Green
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Less Urgent
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On Hold
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2015-07-28
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2015-07-29
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FTS3@RAL: missing proper host names in subjectAltName of FTS agent nodes
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108944
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Red
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Less Urgent
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In Progress
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2014-10-01
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2015-07-17
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CMS
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AAA access test failing at T1_UK_RAL
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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
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29/07/15 |
77.9 |
78.0 |
78.0 |
79.0 |
73.0 |
97 |
100 |
Problem with Tier1 network router.
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30/07/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
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31/07/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
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01/08/15 |
97.4 |
100 |
100 |
100 |
100 |
100 |
99 |
SRM tests failed on Castor GEN instance.
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02/07/15 |
97.3 |
100 |
95.0 |
95.0 |
97.0 |
67 |
96 |
Problem with Tier1 network router.
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03/08/15 |
100 |
100 |
100 |
94.0 |
96.0 |
93 |
97 |
CMS: ARC CE test failures; LHCb: SRM test failure.
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04/07/15 |
72.9 |
73.0 |
73.0 |
73.0 |
73.0 |
100 |
56 |
Planned intervention on the Tier1 Network Routers.
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