RAL Tier1 Operations Report for 4th November 2015
Review of Issues during the week 28th October to 4th November 2015.
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- Early on Saturday (24/10/2015) morning, arc-ce02 developed problems. It was probably due to problems with the underlying hyper-visor. Some other less critical machines on the same hyper-visor were also affected.
- On Monday (26/10/2015) evening, there were problems with the WMS servers. A user was submitting jobs with very big output files. This was filling up the working partition on the machines.
Resolved Disk Server Issues
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- gdss665 (AtlasTape - D0T1) failed on Sat (24th Oct). Following a disk replacement and updating the firmware in the disk controller the system was re-run through the acceptance testing for 5 days before being returned to service yesterday (3rd November).
- gdss663 (AtlasTape - D0T1) failed on Sun (25th Oct). Following a disk and battery replacement and updating the firmware in the disk controller the system was re-run through the acceptance testing for 5 days before being returned to service yesterday (3rd November).
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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- gdss707 (AtlasDataDisk - D1T0) has been out of production since Friday (16th Oct). The server is currently undergoing testing with fabric.
- gdss664 (AtlasTape - D0T1) has had a few issues starting over the weekend. This morning (28th Oct) we decided to remove it from production so it can be investigated.
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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117277
|
Green
|
Urgent
|
Waiting for Reply
|
2015-10-30
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2015-11-03
|
Atlas
|
UK RAL-LCG2 staging error "bring-online timeout has been exceeded" (over 500 errors)
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117248
|
Green
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Less Urgent
|
In Progress
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2015-10-28
|
2015-11-03
|
|
Incorrect Certificate for SRM
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116866
|
Green
|
Less Urgent
|
On Hold
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2015-10-12
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2015-10-19
|
SNO+
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snoplus support at RAL-LCG2 (pilot role)
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116864
|
Green
|
Urgent
|
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
|
28/10/15 |
100 |
100 |
100 |
100 |
100 |
97 |
100 |
|
29/10/15 |
100 |
100 |
100 |
100 |
100 |
93 |
100 |
|
30/10/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
31/10/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
01/11/15 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
02/11/15 |
100 |
100 |
100 |
100 |
96 |
100 |
100 |
Single SRM test failure. "could not open connection to srm-lhcb.gridpp.rl.ac.uk"
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03/11/15 |
100 |
100 |
100 |
100 |
100 |
91 |
100 |
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