RAL Tier1 Operations Report for 15th October 2014
Review of Issues during the week 8th to 15th October 2014.
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- Problems with Castor - particularly affecting Atlas, were reported last week. These were caused by the failure of the battery needed for a cahe in a disk array that hsost the Castor databases. The Castor databases were reconfigured to alleviate the problem. On Wednesday (8th) the battery pack was replaced and the disk array's performance recovered. The following day the re-synchronsation of the standby and primary databases was started. Then yesterday (Tuesday 14th October) there was a scheduled outage of the Atlas and GEN Castor instances while the database configuration was put back in its normal operating state.
- During yesterday (Tuesday) evening a problem arose on all four of the ARC-CEs caused by very large logfile outputs from batch jobs filled up the relevant disk area. This stopped batch work. The problem was resolved this morning. A separate problem on our Nagios monitoring box during the latter part of yesterday evening meant that we did not receive the callout that would have been expected for this.
Resolved Disk Server Issues
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Current operational status and issues
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- The problems reported last week with the Atlas Frontier systems was caused by the performance of the disk array that is being used temporarily by the Cronos back end database. An alternative, faster, disk array is being tested.
- The Castor databases are currently running in a temporary configuration while we await an engineer to come and fix the problem with the battery powering the cache on a disk array.
Ongoing Disk Server Issues
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- GDSS648 (LHCbUser - D1T0) failed on Monday afternoon (13th Oct). The problem is with its networking and investigations are ongoing.
- GDSS720 (AtalsDataDisk - D1T0) is in production in readonly mode. Following a number of problems this server is being drained ahead of further investigations.
Notable Changes made this last week.
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- ARC CEs have been upgraded to version 4.2.0.
- Yesterday (14th Oct) the production FTS3 service was upgraded to version 3.2.28.
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:
- Apply latest Oracle patches (PSU) to the production database systems (Castor, LFC). (Underway).
- A new database (Oracle RAC) has been set-up to host the Atlas3D database. This is updated from CERN via Oracle GoldenGate.
- 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 8th and 15th October 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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lcgfts3.gridpp.rl.ac.uk,
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SCHEDULED
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WARNING
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14/10/2014 12:00
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14/10/2014 13:00
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1 hour
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Upgrade FTS3 servers to version 3.2.28
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Atlas and GEN Castor instances (srm-alice, srm-atlas, srm-biomed, srm-dteam, srm-hone, srm-ilc, srm-mice, srm-minos, srm-na62, srm-snoplus, srm-superb, srm-t2k
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SCHEDULED
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OUTAGE
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14/10/2014 10:00
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14/10/2014 12:00
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2 hours
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Outage of Castor instances ATLAS and GEN (Alice plus non-LHC VOs) during database re-organisation.
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arc-ce02, arc-ce03, arc-ce04
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SCHEDULED
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WARNING
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13/10/2014 11:00
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13/10/2014 12:00
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1 hour
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Upgrade of ARC CEs to version 4.2.0 (Delayed from 9th October).
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lcgwms05.gridpp.rl.ac.uk,
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SCHEDULED
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OUTAGE
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12/10/2014 09:00
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14/10/2014 17:00
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2 days, 8 hours
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update to EMI 3.20
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lcgwms04.gridpp.rl.ac.uk,
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SCHEDULED
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OUTAGE
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09/10/2014 14:00
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10/10/2014 16:35
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1 day, 2 hours and 35 minutes
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draining before EMI 3 update 20 update
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arc-ce02, arc-ce03, arc-ce04
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SCHEDULED
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WARNING
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09/10/2014 10:00
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09/10/2014 11:00
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1 hour
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Upgrade of ARC CEs to version 4.2.0
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All Castor
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UNSCHEDULED
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WARNING
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07/10/2014 15:00
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08/10/2014 16:27
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1 day, 1 hour and 27 minutes
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Extending warning while databases running with degraded RAID battery
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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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109329
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Green
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Less Urgent
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In Progress
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2014-10-14
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2014-10-14
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CMS
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access to lcgvo04.gridpp.rl.ac.uk
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109276
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Green
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Less Urgent
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In Progress
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2014-10-11
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2014-10-13
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CMS
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Submissions to RAL FTS3 REST interface are failing for some users
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109267
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Green
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Urgent
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In Progress
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2014-10-10
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2014-10-14
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CMS
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possible trouble accessing pileup dataset
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109253
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Green
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Top Priority
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In Progress
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2014-10-09
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2014-10-14
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Atlas
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RAL FTS3 issue
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108944
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Green
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Urgent
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In Progress
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2014-10-01
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2014-10-14
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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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In Progress
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2014-08-27
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2014-10-07
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Atlas
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BDII vs SRM inconsistent storage capacity numbers
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107880
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Red
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Less Urgent
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In Progress
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2014-08-26
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2014-10-08
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SNO+
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srmcp failure
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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
|
08/10/14 |
100 |
100 |
100 |
100 |
100 |
91 |
100 |
|
09/10/14 |
100 |
100 |
100 |
100 |
100 |
95 |
100 |
|
10/10/14 |
100 |
100 |
100 |
100 |
100 |
94 |
94 |
|
11/10/14 |
100 |
100 |
100 |
100 |
100 |
95 |
93 |
|
12/10/14 |
100 |
100 |
100 |
100 |
100 |
98 |
98 |
|
13/10/14 |
100 |
100 |
100 |
100 |
100 |
99 |
98 |
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14/10/14 |
100 |
100 |
88.6 |
96.5 |
100 |
91 |
99 |
For Atlas: An outage of two hours during scheduled Castor DB re-configuration. Atlas & CMS: Evening problems with ARC CEs.
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