RAL Tier1 Operations Report for 12th November 2014
Review of Issues during the week 5th to 12th November 2014.
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- Over the weekend there was a hardware problem on one of the database nodes behind the Atlas 3D/Frontier service. The Oracle RAC continued to function correctly using the other available nodes and there was no impact on the service.
Resolved Disk Server Issues
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Current operational status and issues
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- Some problems on Atlas Castor instance. At various times in the last couple of weeks the Atlas workload has led to differing groups of disk servers spending a lot of time in a "wait i/o" state. This is triggered by reads using xroot and has led to some SAM test failures.
Ongoing Disk Server Issues
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Notable Changes made this last week.
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- Doubling the uplink (10 -> 20Gbit) on the network stack used by the Tape servers as the existing link was at full capacity.
- Grid Service updates: BDIIs updated to EMI 3 update 21; LB nodes updated to EMI 3 update 21; LFC updated to EMI 3 update 16.
- OS Errata rolled out to Castor GEN instance (headnodes & disk servers) this morning (12th Nov).
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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Atlas, CMS & LHCb Castor instances (srm-atlas, srm-cms, srm-lhcb)
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SCHEDULED
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WARNING
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19/11/2014 11:00
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19/11/2014 12:00
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1 hour
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Warning on Castor Atlas, CMS and LHCb instance during application of OS errata updates.
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Castor GEN instance
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SCHEDULED
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WARNING
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12/11/2014 11:00
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12/11/2014 12:00
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1 hour
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Warning on Castor GEN instance during application of OS errata updates.
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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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- The rollout of the RIP protocol to the Tier1 routers still has to be completed.
- First quarter 2015: Circuit testing of the remaining (i.e. non-UPS) circuits in the machine room.
Listing by category:
- Databases:
- A new database (Oracle RAC) has been set-up to host the Atlas3D database. This is updated from CERN via Oracle GoldenGate. This systsme is still to be brought into use. (Currently Atals 3D/Frontier still uses teh OGMA datase system, although this was also changed to update from CERN using Oracle Golden Gate.
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update Castor headnodes to SL6.
- Fix discrepancies were found in some of the Castor database tables and columns. (The issue has no operational impact.)
- Networking:
- Move switches connecting the 2011 disk servers batches onto the Tier1 mesh network.
- Make routing changes to allow the removal of the UKLight Router.
- Enable the RIP protocol for updating routing tables on the Tier1 routers.
- Fabric
- Migration of data to new T10KD tapes. (Migration of CMS from 'B' to 'D' tapes underway; migration of GEN from 'A' to 'D' tapes to follow.)
- Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
- There will be circuit testing of the remaining (i.e. non-UPS) circuits in the machine room (Expected first quarter 2015).
Entries in GOC DB starting between the 5th and 12th November 2014.
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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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Castor GEN instance
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SCHEDULED
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WARNING
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12/11/2014 11:00
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12/11/2014 12:00
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1 hour
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Warning on Castor GEN instance during application of OS errata updates.
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Whole site.
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UNSCHEDULED
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WARNING
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05/11/2014 09:00
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05/11/2014 10:00
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1 hour
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Putting site At Risk for a reboot of network router. Anticipate only two very short (few seconds) break in connectivity.
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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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110028
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Green
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Less Urgent
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Waiting for Reply
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2014-11-10
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2014-11-11
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CMS
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Phedex transfer problems from T1_UK_RAL_Buffer
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109712
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Green
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Urgent
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On Hold
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2014-10-29
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2014-11-10
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CMS
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Glexec exited with status 203; ...
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109694
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Green
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Urgent
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On hold
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2014-11-03
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2014-11-06
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SNO+
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gfal-copy failing for files at RAL
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108944
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Yellow
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Urgent
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On Hold
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2014-10-01
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2014-11-03
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CMS
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AAA access test failing at T1_UK_RAL
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107935
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Red
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Less Urgent
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On Hold
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2014-08-27
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2014-11-03
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Atlas
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BDII vs SRM inconsistent storage capacity numbers
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106324
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Red
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Urgent
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On Hold
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2014-06-18
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2014-10-13
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CMS
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pilots losing network connections 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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05/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
06/11/14 |
100 |
100 |
89.3 |
100 |
100 |
100 |
100 |
Two blocks of test failures (06:00-07:00 & 09:00-10:00) Error 'Handling Timeout'.
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07/11/14 |
100 |
100 |
96.5 |
100 |
100 |
100 |
100 |
Several SRM PUT test failures (timeouts).
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08/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
09/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
10/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
11/11/14 |
100 |
100 |
98.3 |
100 |
100 |
100 |
98 |
Two SRM test failures one after the other.
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