RAL Tier1 Operations Report for 26th November 2014
Review of Issues during the week 19th to 26th November 2014.
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- On the evening of Tuesday 18th, the CMS transfer manager machine (lcgclsf02) failed. The services failed over to the backup. A replacement machine was prepared and put into service that afternoon. The following day the original system was fixed and returned to service.
- In the early hours of Friday 21st Nov. there was a problem of locking sessions in the Castor database that affected CMS & LHCb.
Resolved Disk Server Issues
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- GDSS673 (LhcbRawDst - D0T1) had failed during the evening of Friday 14th November. The server was returned to production around midday on Thursday 20th NOv.
Current operational status and issues
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- Some problems on Atlas Castor instance. At various times in recent 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 the numbers of 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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- Latest WMS updates (EMI 3 update 22) applied to WMSs.
- FTS3 upgraded to 3.2.30
- OS Errata updates applied to all Castor systems (apart from GEN instance for which this had already been done).
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.(Provisional dates: week 12-16 January).
- Castor headnode upgrades to SL6: (Assume 4 hour outage of Castor instance in each case for stager updates).
- Tuesday 2nd Dec - LHCb; Tues 9th Dec - CMS; Wed 10th Dec - Atlas; Wednesday 7th Jan - GEN; Thursday 8th Jan - Nameserver (transparent - at risk)
Listing by category:
- Databases:
- A new database (Oracle RAC) has been set-up to host the Atlas 3D database. This is updated from CERN via Oracle GoldenGate. This system is yet to be brought into use. (Currently Atlas 3D/Frontier still uses the 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 19th and 26th 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 (srm endpoints).
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SCHEDULED
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WARNING
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25/11/2014 11:00
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25/11/2014 12:00
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1 hour
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At risk on some castor instances while we deploy errata updates
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Whole site
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UNSCHEDULED
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WARNING
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25/11/2014 07:00
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25/11/2014 08:00
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1 hour
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Site warning during firewall configuration change.
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lcgfts3.gridpp.rl.ac.uk,
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SCHEDULED
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WARNING
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24/11/2014 10:00
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24/11/2014 12:00
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2 hours
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At risk for FTS3 upgrade to 3.2.30
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srm-cms-disk.gridpp, srm-cms.gridpp.rl.ac.uk
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UNSCHEDULED
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WARNING
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20/11/2014 14:00
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20/11/2014 15:00
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1 hour
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At risk while we return a CMS Castor headnode to production
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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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110360
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Green
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Less Urgent
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Waiting for Reply
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2014-11-25
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2014-11-25
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SNO+
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Jobs failing to load cvmfs data
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110244
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Green
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Less Urgent
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In progress
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2014-11-19
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2014-11-24
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None
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LFC Webdav support
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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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2014-11-24
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SNO+
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gfal-copy failing for files at RAL
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109276
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Green
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Urgent
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In Progress
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2014-22
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2014-24
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SNO+
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gfal-copy failing for files at RAL (re-opened)
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108944
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Amber
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Urgent
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In Progress
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2014-10-01
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2014-11-24
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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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19/11/14 |
100 |
100 |
98.3 |
92.8 |
100 |
100 |
n/a |
SRM test failures. For CMS there was a general problem affecting multiple sites.
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20/11/14 |
100 |
100 |
99.2 |
99.3 |
100 |
99 |
n/a |
Single SRM test failures.
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21/11/14 |
100 |
100 |
95.8 |
92.4 |
91.7 |
99 |
n/a |
SRM test failures caused by problem of locking sessions in database.
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22/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
23/11/14 |
100 |
100 |
100 |
100 |
100 |
87 |
95 |
|
24/11/14 |
100 |
100 |
100 |
100 |
95.8 |
96 |
n/a |
Single SRM test failure.
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25/11/14 |
100 |
100 |
99.1 |
100 |
100 |
100 |
n/a |
Expired proxy affected Atlas tests for many sites.
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