DRAFT - DO NOT USE - RAL Tier1 Operations Report for 28st October 2015
Review of Issues during the week 14th to 21st October 2015.
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- Arc-ce02had problems over the weekend. It was probably due to problems with the underlying hyper-visor. Some other less critical machines on the same hyper-visor were also affected.
Resolved Disk Server Issues
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Current operational status and issues
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- The LHCb problem with a low but persistent rate of failure when copying the results of batch jobs to Castor. There is also a further problem that sometimes occurs when these (failed) writes are attempted to storage at other sites.
- The intermittent, low-level, load-related packet loss seen over external connections is still being tracked. Likewise we have been working to understand some remaining low level of packet loss seen within a part of our Tier1 network.
- Long-standing CMS issues. The two items that remain are CMS Xroot (AAA) redirection and file open times. Work is ongoing into the Xroot redirection with a new server having been added in recent weeks. File open times using Xroot remain slow but this is a less significant problem.
Ongoing Disk Server Issues
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Notable Changes made since the last meeting.
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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 remaining Castor disk servers (those in tape-backed service classes) to SL6. This will be transparent to users.
- Some detailed internal network re-configurations to enable the removal of the old 'core' switch from our network. This includes changing the way the UKLIGHT router connects into the Tier1 network.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update disk servers to SL6 (ongoing)
- Update to Castor version 2.1.15.
- Networking:
- Complete changes needed to remove the old core switch from the Tier1 network.
- Make routing changes to allow the removal of the UKLight Router.
- Fabric
- Firmware updates on remaining EMC disk arrays (Castor, LFC)
Entries in GOC DB starting since the last report.
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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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117171
|
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very urgent
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waiting for reply
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2015-10-24
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2015-10-27
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LHCb
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Aborted pilots on arc-ce02.gridpp.rl.ac.uk
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116866
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Green
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Less Urgent
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On Hold
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2015-10-12
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2015-10-19
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SNO+
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snoplus support at RAL-LCG2 (pilot role)
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116864
|
Green
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Urgent
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In Progress
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2015-10-12
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2015-10-26
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CMS
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T1_UK_RAL AAA opening and reading test failing again...
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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
|
21/10/15 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
|
22/10/15 |
100 |
100 |
98 |
100 |
100 |
100 |
100 |
SRM test failure on PUT. (__main__.TimeoutException)
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23/10/15 |
100 |
100 |
92 |
100 |
100 |
100 |
100 |
(Four SRM test failures. Three on ‘GET’, one on ‘PUT’. All: “__main__.TimeoutException”
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24/10/15 |
100 |
100 |
100 |
100 |
100 |
boo |
100 |
|
25/10/15 |
100 |
100 |
100 |
100 |
100 |
97 |
98 |
|
26/10/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
27/10/15 |
100 |
100 |
100 |
100 |
100 |
boo |
b00 |
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