Difference between revisions of "Tier1 Operations Report 2016-07-27"
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| style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Notable Changes made since the last meeting. | | style="background-color: #b7f1ce; border-bottom: 1px solid silver; text-align: center; font-size: 1em; font-weight: bold; margin-top: 0; margin-bottom: 0; padding-top: 0.1em; padding-bottom: 0.1em;" | Notable Changes made since the last meeting. | ||
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+ | * The LSST VO has been enabled on the batch farm. | ||
* Three disk servers each of 57TB capacity have been deployed into each of the following tape caches: AtlasTape, cmsTape, lhcbRawRdst. (I.e. a total of nine servers). These will enable the withdrawal of some of the older disk servers from these service classes. | * Three disk servers each of 57TB capacity have been deployed into each of the following tape caches: AtlasTape, cmsTape, lhcbRawRdst. (I.e. a total of nine servers). These will enable the withdrawal of some of the older disk servers from these service classes. | ||
* A modification to the Condor configuration to make use of shared ports has been made. This has significantly reduced the incidence of batch job restarts. | * A modification to the Condor configuration to make use of shared ports has been made. This has significantly reduced the incidence of batch job restarts. |
Revision as of 08:02, 27 July 2016
RAL Tier1 Operations Report for 27th July 2016
Review of Issues during the week 20th to 27th July 2016. |
- There has been continued saturation of the inbound 10Gbit OPN link at times over the last week. The bypass route to JANET has also shown high traffic volumes. We are investigating using both the primary and backup data links for data transfers.
Resolved Disk Server Issues |
- GDSS650 (LHCbUser, D1T0) which failed on Monday (19th July) was returned to service on Wednesday afternoon (20th). There was a single file lost which was being written when server failed.
- GDSS634 (AtlasTape, doT1) crashed on Thursday 21st July. It was returned to service on Monday, 25th July. This looks like a disk controller failure. Eleven files that were being written as it failed were reported lost to Atlas.
- GDSS678 (CMSTape D0T1) crashed on Saturday (23rd July). It was returned to service, initially read-only, the following day.
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.
Ongoing Disk Server Issues |
- GDSS675 (CMSTape D0T1) was taken out of service on Tuesday morning. 26th July. It had a second disk failure while the first one was being rebuilt. All files awaiting migration to tape were flushed off the server before it was taken out of service.
Notable Changes made since the last meeting. |
- The LSST VO has been enabled on the batch farm.
- Three disk servers each of 57TB capacity have been deployed into each of the following tape caches: AtlasTape, cmsTape, lhcbRawRdst. (I.e. a total of nine servers). These will enable the withdrawal of some of the older disk servers from these service classes.
- A modification to the Condor configuration to make use of shared ports has been made. This has significantly reduced the incidence of batch job restarts.
- Both "production" and "test" FTS3 services have been upgraded to version 3.4.7
- The migration of Atlas data from "C" to "D" tapes continues. We have migrated over 900 of the 1300 tapes so far.
Declared in the GOC DB |
Service | Scheduled? | Outage/At Risk | Start | End | Duration | Reason |
---|---|---|---|---|---|---|
lfc.gridpp.rl.ac.uk, lfc.gridpp.rl.ac.uk, | SCHEDULED | WARNING | 01/08/2016 12:00 | 01/08/2016 17:00 | 5 hours | RAC Oracle backend migration to new hardware |
lfc.gridpp.rl.ac.uk, lfc.gridpp.rl.ac.uk, | SCHEDULED | OUTAGE | 01/08/2016 09:00 | 01/08/2016 12:00 | 3 hours | RAC Oracle backend migration to new hardware |
Advanced warning for other interventions |
The following items are being discussed and are still to be formally scheduled and announced. |
Listing by category:
- Castor:
- Update SRMs to new version, including updating to SL6. This will be done after the Castor 2.1.15 update.
- Update to Castor version 2.1.15. This awaits successful resolution and testing of the new version.
- Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
- Networking:
- Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
- Fabric
- Firmware updates on older disk servers.
Entries in GOC DB starting since the last report. |
- None
Open GGUS Tickets (Snapshot during morning of meeting) |
GGUS ID | Level | Urgency | State | Creation | Last Update | VO | Subject |
---|---|---|---|---|---|---|---|
122827 | Green | Less Urgent | In Progress | 2016-07-12 | 2016-07-13 | SNO+ | Disk area at RAL |
122818 | Green | Less Urgent | In Progress | 2016-07-12 | 2016-07-12 | Atlas | Object Store at RAL |
122804 | Green | Less Urgent | Waiting Reply | 2016-07-12 | 2016-07-15 | SNO+ | glite-transfer failure |
122364 | Green | Less Urgent | In Progress | 2016-06-27 | 2016-07-15 | cvmfs support at RAL-LCG2 for solidexperiment.org | |
121687 | Yellow | Less Urgent | On Hold | 2016-05-20 | 2016-05-23 | packet loss problems seen on RAL-LCG perfsonar | |
120810 | Green | Urgent | In Progress | 2016-04-13 | 2016-06-24 | Biomed | Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users |
120350 | Green | Less Urgent | Waiting Reply | 2016-03-22 | 2016-07-26 | LSST | Enable LSST at RAL |
119841 | Red | Less Urgent | On Hold | 2016-03-01 | 2016-04-26 | LHCb | HTTP support for lcgcadm04.gridpp.rl.ac.uk |
117683 | Yellow | Less Urgent | On Hold | 2015-11-18 | 2016-04-05 | CASTOR at RAL not publishing GLUE 2 |
Availability Report |
Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 729); CMS HC = CMS HammerCloud
Day | OPS | Alice | Atlas | CMS | LHCb | Atlas HC | CMS HC | Comment |
---|---|---|---|---|---|---|---|---|
20/07/16 | 100 | 100 | 100 | 98 | 100 | 100 | 100 | Single SRM test failure: User Timeout. |
21/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
22/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
23/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
24/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
25/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
26/07/16 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |