Difference between revisions of "Tier1 Operations Report 2015-12-23"
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<!-- ******* still to be formally scheduled and/or announced ******* -----> | <!-- ******* still to be formally scheduled and/or announced ******* -----> | ||
* Upgrade of remaining Castor disk servers (those in tape-backed service classes) to SL6. This will be transparent to users. | * Upgrade of remaining Castor disk servers (those in tape-backed service classes) to SL6. This will be transparent to users. | ||
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'''Listing by category:''' | '''Listing by category:''' | ||
* Databases: | * Databases: | ||
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* Castor: | * Castor: | ||
** Update SRMs to new version (includes updating to SL6). | ** Update SRMs to new version (includes updating to SL6). | ||
− | ** Update disk servers to SL6 (ongoing) | + | ** Update disk servers in tape-backed service classes to SL6 (ongoing) |
** Update to Castor version 2.1.15. | ** Update to Castor version 2.1.15. | ||
* Networking: | * Networking: | ||
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** Make routing changes to allow the removal of the UKLight Router. | ** Make routing changes to allow the removal of the UKLight Router. | ||
* Fabric | * Fabric |
Revision as of 17:24, 22 December 2015
RAL Tier1 Operations Report for 23rd December 2015
Review of Issues during the fortnight 9th to 23rd December 2015. |
- On Thursday 10th December there was a significant problem on the Tier1 network. A packet storm was followed by the Tier1 network being disconnected from the site network. The trigger appears to have been the restarting of a particular switch. The details of this are not yet understood.
- There was a problem with the recall from tape of a large number of files for LHCb over the weekend of 11/12/13 Dec. This was caused by some poor performance of at least one of the disk servers in the disk cache and a parameter introduced in the Castor 2.1.15 tape servers that delayed the reporting of when files were read from tape.
Resolved Disk Server Issues |
- GDSS675 (CMSTape - D0T1) failed in the early hours of 8th Dec. On investigation found there were two disks that had failed. Returned to production on 11th December.
- GDSS620 (GenTape - D0T1) also failed during the early morning of 8th Dec. Also returned to production on the 11th Dec. No cause found.
- GDSS689 (AtlasDataDisk - D1T0) was taken out of production on the 10th Dec. when a second disk failed during the rebuilding of a first. Returned to production after the first disk rebuild had completed on Tuesday 15th Dec.
- GDSS654 (LHCbRawRDst - D0T1) was taken out of service on the 11th Dec. Again a precaution as a double disk failure. Returned to production on the 13th Dec.
- GDSS617 (AliceDisk -D1T0) Crashed on the 15th Dec. After tests no underlying cause found. Returned to production on the 17th Dec.
- GDSS710 (CMSDisk - D1T0) Taken out of production for a short while for a reboot as the RAID card was not seeing a replacement disk.
- GDSS686 (AtlasDataDisk - D1T0) Taken out of production on the 21st Dec. as there was double disk failure. Returne dto production on the 22nd after teh first disk had rebuilt.
Current operational status and issues |
- There is a problem seen by LHCb of 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. A recent modification has improved, but not completed fixed this.
- 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.
- There is a problem reported by LHCb of a high rate of batch job failures since around the9th December. The cause is not yet known.
Ongoing Disk Server Issues |
- GDSS665 (AtlasTape) failed on the 21st Dec. It was rebooted and all canbemigr files migrated to tape. It is undergoing tests.
- GDSS620 (GenTape - D0T1) failed again (see above) on the 22nd Dec. It was rebooted and all canbemigr files migrated to tape. It is undergoing tests.
Notable Changes made since the last meeting. |
- The final steps have been taken for the removal of the old core network switch which has now been taken off the network.
- A board has replaced in the UKLight router and another added. Following this the link between the UKLight router and the RAL border router was doubled from a single to a pair of 10Gbit connections. Thus doubling our data bandwidth over this route.
- In order to ease problems with tape recalls servers in the LHCbRawRDst service class were converted to use the Linux NOOP IO scheduler.
Declared in the GOC DB |
None
Advanced warning for other interventions |
The following items are being discussed and are still to be formally scheduled and announced. |
- Upgrade of remaining Castor disk servers (those in tape-backed service classes) to SL6. This will be transparent to users.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update disk servers in tape-backed service classes to SL6 (ongoing)
- Update to Castor version 2.1.15.
- Networking:
- 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. |
Service | Scheduled? | Outage/At Risk | Start | End | Duration | Reason |
---|---|---|---|---|---|---|
All Castor (All SRMs) | UNSCHEDULED | WARNING | 15/12/2015 08:00 | 15/12/2015 09:00 | 1 hour | Warning on data transfers to/from site during board swap in network router. |
Whole Site | UNSCHEDULED | OUTAGE | 10/12/2015 11:45 | 10/12/2015 15:15 | 3 hours and 30 minutes | Internal network issues at RAL Tier1 (retrospective) |
All Castor (All SRMs) | SCHEDULED | WARNING | 09/12/2015 09:30 | 09/12/2015 10:30 | 1 hour | Warning on Castor services for short network reconfiguration. |
Open GGUS Tickets (Snapshot during morning of meeting) |
GGUS ID | Level | Urgency | State | Creation | Last Update | VO | Subject |
---|---|---|---|---|---|---|---|
118345 | Green | Very Urgent | Waiting for Reply | 2015-12-14 | 2015-12-15 | Usage of your WMS | |
118209 | Green | Less Urgent | In Progress | 2015-12-15 | 2015-12-18 | Enabling CVMFS for the vo.neugrid.eu VO | |
118044 | Green | Less Urgent | In Progress | 2015-11-30 | 2015-12-16 | Atlas | gLExec hammercloud jobs failing at RAL-LCG2 since October |
117846 | Green | Urgent | Waiting for Reply | 2015-11-23 | 2015-12-15 | Atlas | ATLAS request- storage consistency checks |
117683 | Green | Less Urgent | In Progress | 2015-11-18 | 2015-11-19 | CASTOR at RAL not publishing GLUE 2 | |
116866 | Amber | Less Urgent | On Hold | 2015-10-12 | 2015-12-18 | SNO+ | snoplus support at RAL-LCG2 (pilot role) |
116864 | Red | Urgent | In Progress | 2015-10-12 | 2015-12-16 | CMS | T1_UK_RAL AAA opening and reading test failing again... |
Availability Report |
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 |
---|---|---|---|---|---|---|---|---|
09/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
10/12/15 | 98.5 | 100 | 97 | 92 | 85 | 93 | 100 | Problems on Tier1 network led to test failures. |
11/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
12/12/15 | 100 | 100 | 100 | 100 | 96 | 100 | 100 | Single SRM test failure as the test was not able to copy a file in |
13/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
14/12/15 | 100 | 100 | 98 | 98 | 100 | 100 | 96 | Atlas: Single SRM test failure (timeout) on GET. CMS: The org.sam.CONDOR-JobSubmit test on all ARC-CEs “Unspecified gridmanager error”“ |
15/12/15 | 100 | 100 | 100 | 99 | 100 | 100 | 100 | Continuation of above. |
16/12/15 | 100 | 100 | 98 | 96 | 100 | 98 | 100 | Atlas: Single SRM Test failure on PUT. (Timeout); CMS: Single SRM Test failure ‘File was NOT copied to SRM’ |
17/12/15 | 100 | 100 | 100 | 96 | 100 | 98 | 100 | Single SRM test failure on PUT: Input/output error |
18/12/15 | 100 | 100 | 100 | 100 | 100 | 96 | 95 | |
19/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
20/12/15 | 100 | 100 | 100 | 100 | 96 | 100 | 100 | Single SRM test failure on list: [SRM_INVALID_PATH] No such file or directory |
21/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
22/12/15 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |