RAL Tier1 Operations Report for 26th August 2015
Review of Issues during the week 19th to 26th August 2015.
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- Last week we reported a significant backlog of migrations to tape for Atlas as the instance was seeing very high load. Castor caught up with the backlog overnight Thursday/Friday (21/21 Aug) - and there have been no problems since then.
Resolved Disk Server Issues
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Current operational status and issues
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- As reported last week the post mortem review of the network incident on the 8th April has been finalised. It can be seen here:
- The intermittent, low-level, load-related packet loss over the OPN to CERN is still being tracked. An attempted fix (replacing the cables between the Tier1 core network and the UKLight router) had no effect.
- 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. The poor batch job efficiencies have been improved since a change to the Linux I/O scheduler on CMS disk servers.
Ongoing Disk Server Issues
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Notable Changes made since the last meeting.
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- The rollout of the new worker node configuration continues. Around a quarter of the batch farm has now been upgraded.
- The network link between the Tier1 core network and the UKLight router was switched to a new pair of fibres.
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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Castor Atlas & GEN instances.
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SCHEDULED
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OUTAGE
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13/10/2015 08:00
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13/10/2015 16:00
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8 hours
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Outage of All Castor instances during upgrade of Oracle back end database.
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All Castor
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SCHEDULED
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WARNING
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08/10/2015 08:30
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08/10/2015 20:30
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12 hours
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Warning (At Risk) on All Castor instances during upgrade of back end Oracle database.
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All Castor
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SCHEDULED
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OUTAGE
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06/10/2015 08:00
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06/10/2015 20:30
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12 hours and 30 minutes
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Outage of All Castor instances during upgrade of Oracle back end database.
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Castor Atlas & GEN instances.
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SCHEDULED
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WARNING
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22/09/2015 08:30
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22/09/2015 20:30
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12 hours
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Warning (At Risk) on Atlas and GEN Castor instances during upgrade of back end Oracle database.
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Castor Atlas & GEN instances.
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SCHEDULED
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OUTAGE
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15/09/2015 08:00
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15/09/2015 20:30
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12 hours and 30 minutes
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Outage of Atlas and GEN Castor instances during upgrade of Oracle back end database.
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Whole Site
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SCHEDULED
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WARNING
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03/09/2015 08:25
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03/09/2015 09:25
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1 hour
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At risk on site during brief network re-configuration. Actual change expected at 07:30 (UTC).
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All Castor Disk Only Service Classes.
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SCHEDULED
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WARNING
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27/08/2015 09:30
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27/08/2015 19:00
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9 hours and 30 minutes
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Warning on Castor Disk Storage as servers upgraded to SL6. This is a rolling update of the servers - and each is expected to be unavailable for around 30 minutes during the upgrade. (Continuation of rolling upgrade from previous day).
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All Castor Disk Only Service Classes.
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SCHEDULED
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WARNING
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26/08/2015 09:30
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26/08/2015 18:00
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8 hours and 30 minutes
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Warning on Castor Disk Storage as servers upgraded to SL6. This is a rolling update of the servers - and each is expected to be unavailable for around 30 minutes during the upgrade.
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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. For the D1T0 Service Classes this is being done today/tomorrow (26/27 August) with extended 'At Risks'. (Declared in GOC DB)
- Upgrade of the Oracle databases behind Castor to version 11.2.0.4. This is a multi-step intervention. Dates declared in GOC DB (See above).
- Some detailed internal network reconfigurations to be tackled now that the routers are stable. Notably:
- Brief (less than 20 seconds) break in internal connectivity while systems in the UPS room are re-connected. (3rd Sep.)
- Replacement of cables and connectivity to the UKLIGHT router that provides our link to both the OPN Link to CERN and the bypass route for other data transfers.
- 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 (ongoing)
- 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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All Castor disk-only service classes.
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SCHEDULED
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WARNING
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26/08/2015 09:30
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26/08/2015 18:00
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8 hours and 30 minutes
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Warning on Castor Disk Storage as servers upgraded to SL6. This is a rolling update of the servers - and each is expected to be unavailable for around 30 minutes during the upgrade.
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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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115805
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Green
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Less Urgent
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In progress
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2015-08-21
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2015-08-21
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SNO+
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RAL WMS logs
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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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2015-08-26
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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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In progress
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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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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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2015-08-17
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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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19/08/15 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
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20/08/15 |
100 |
100 |
100 |
100 |
100 |
97 |
100 |
|
21/08/15 |
100 |
100 |
100 |
100 |
100 |
86 |
96 |
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22/08/15 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
|
23/08/15 |
100 |
100 |
100 |
100 |
100 |
94 |
n/a |
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24/08/15 |
100 |
100 |
100 |
100 |
100 |
94 |
100 |
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25/08/15 |
100 |
95.0 |
98.0 |
100 |
100 |
97 |
98 |
Alice: Single ARC CE test failure; Atlas: Single SRM test failure.
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