RAL Tier1 Operations Report for 7th September2016
| Review of Issues during the fortnight 24th August to 9th September 2016.
|
- As reported last week there in an ongoing intermittent problem with packet loss seen across a part of the Tier1 network. The cause is not yet understood.
| Resolved Disk Server Issues
|
- GDSS776 (LHCbDst - D1T0) failed with a read-only file system on Thursday 1st September, It was put back in service the following day - initially read-only as a RAID rebuild was still taking place. 16 files being written when the server crashed were lost.
| 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.
- The intermittent, low-level, load-related packet loss seen over external connections is still being tracked.
| Ongoing Disk Server Issues
|
- GDSS665 (AtlasTape - D0T1) failed with a read-only filesystem yesterday on Sunday 4th Sep. All files that were awaiting migration have now been copied to tape. Server still under investigation.
| Notable Changes made since the last meeting.
|
- Configuration change made yesterday such that CMS jobs on all worker nodes can access remote data without requiring to go through a proxy.
- This morning the latest cvmfs client v2.2.3-1 has been installed on all WNs
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| All Castor that uses tape
|
SCHEDULED
|
WARNING
|
13/09/2016 08:00
|
13/09/2016 17:00
|
9 hours
|
Maintenance on Tape Library. Tape access for read will stop. Writes will be buffered on disk and flushed to tape after the maintenance has completed.
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
Listing by category:
- Preventative Maintenance on the Tape Libraries. Tuesday 13th September.
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 LHCb data from T10KC to T10KD tapes.
- 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.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| arc-ce01.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
25/08/2016 10:00
|
02/09/2016 09:59
|
7 days, 23 hours and 59 minutes
|
ARC-CE01 being drained ahead of a reconfiguration and move to run on different infrastructure.
|
| srm-biomed.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
04/08/2016 14:00
|
05/09/2016 14:00
|
32 days,
|
Storage for BIOMED is no longer supported since the removal of the GENScratch storage area.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 123504
|
Green
|
Less Urgent
|
In Progress
|
2016-08-19
|
2016-08-23
|
T2K
|
proxy expiration
|
| 123403
|
Green
|
Less Urgent
|
Waiting Reply
|
2016-08-15
|
2016-08-17
|
|
FTS gets a SIGSEGV during a transfer
|
| 122827
|
Green
|
Less Urgent
|
In Progress
|
2016-07-12
|
2016-08-22
|
SNO+
|
Disk area at RAL
|
| 122364
|
Green
|
Less Urgent
|
On Hold
|
2016-06-27
|
2016-08-23
|
|
cvmfs support at RAL-LCG2 for solidexperiment.org
|
| 121687
|
Red
|
Less Urgent
|
On Hold
|
2016-05-20
|
2016-05-23
|
|
packet loss problems seen on RAL-LCG perfsonar
|
| 120350
|
Yellow
|
Less Urgent
|
Waiting Reply
|
2016-03-22
|
2016-08-09
|
LSST
|
Enable LSST at RAL
|
| 117683
|
Amber
|
Less Urgent
|
On Hold
|
2015-11-18
|
2016-04-05
|
|
CASTOR at RAL not publishing GLUE 2
|
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
|
| 24/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 25/08/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 26/08/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 27/08/16 |
100 |
100 |
100 |
100 |
96 |
N/A |
100 |
Single SRM error on listing: [SRM_INVALID_PATH] No such file or directory
|
| 28/08/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 29/08/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 30/08/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 31/08/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 01/09/16 |
100 |
100 |
100 |
98 |
100 |
N/A |
100 |
Single SRM test failure because of a user timeout error
|
| 02/09/16 |
100 |
100 |
100 |
96 |
100 |
N/A |
100 |
Two SRM test failure because of a user timeout errors
|
| 03/09/16 |
100 |
100 |
100 |
94 |
100 |
N/A |
100 |
Single SRM test failure because of a user timeout error - but next test did not run for a while.
|
| 04/09/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 05/09/16 |
100 |
100 |
100 |
98 |
100 |
N/A |
100 |
Single SRM test failure because of a user timeout error
|
| 06/09/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
