RAL Tier1 Operations Report for 15th June 2016
| Review of Issues during the week 8th to 15th June 2016.
|
- Problems with the tape library were reported last week - and in meetings before then. During this week we have not had any hardware problems with the library. However, the control software became very unstable at the end of last week and continued to be unstable through the weekend. We have been in contact with Oracle about this problem. Yesterday (14th) the control system was configured to only use tape drives in the non-Tier1 library - this includes four Tier1 drives physically located in that library. The system ran stably during last night - with this very limited Tier1 tape capacity. This morning some more of the tape drives in the Tier1 library have been progressively brought into use and we are closely monitoring the software during this process.
- We continue to high usage of the OPN link to CERN with the inbound traffic saturating the 10Gbit link for several periods (of some hours each) within the week.
| Resolved Disk Server Issues
|
- GDSS670 (AliceDisk - D1T0) crashed in the early hours of Sunday morning (12th). Following a disk replacement it was put back in service in read-only mode at the end of Monday afternoon (13th) as another disk was showing media errors. Returned to full production this morning (15th).
| 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
|
| Notable Changes made since the last meeting.
|
- The latest version of the "machine job features" software has been rolled out to all worker nodes.
- The "test" FTS3 instance was upgraded to version 3.4.6 last Thursday.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| lcgwms06.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
01/06/2016 11:00
|
30/06/2016 11:00
|
29 days,
|
Server lcgwms06.gridpp.rl.ac.uk Decommissioning
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- Decommissioning of "GEN Scratch" storage in Castor. (Formally announced by EGI broadcast). Write access to this area has now been stopped in preparation for completely stopping access on the 20th June.
- Decommissioning of lcgwms06. This has stopped receiving new work ahead of full withdrawal.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- 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 remaining EMC disk arrays (Castor, LFC)
- Grid Services
- Once the use of the Load Balancer (HAProxy) has been proven for the test FTS service it will be extended to other services.
| Entries in GOC DB starting since the last report.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| All Castor tape
|
UNSCHEDULED
|
WARNING
|
14/06/2016 12:00
|
15/06/2016 14:00
|
1 day, 2 hours
|
Tape access limited while we investigate problem with tape library control software crashing.
|
| lcgfts3.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
08/06/2016 10:00
|
08/06/2016 11:00
|
1 hour
|
Upgrade of FTS3 service to version 3.4.6
|
| lcgwms06.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
01/06/2016 11:00
|
30/06/2016 11:00
|
29 days,
|
Server lcgwms06.gridpp.rl.ac.uk Decommissioning
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 121894
|
Green
|
Top Priority
|
in Progress
|
2016-06-01
|
2016-06-01
|
|
Tier-1 LHCOPN IPv6 Peering, incl. dualstack Perfsonar
|
| 121687
|
Green
|
Less Urgent
|
On Hold
|
2016-05-20
|
2016-05-23
|
|
packet loss problems seen on RAL-LCG perfsonar
|
| 120810
|
Red
|
Urgent
|
In Progress
|
2016-04-13
|
2016-05-24
|
Biomed
|
Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users
|
| 120350
|
Green
|
Less Urgent
|
In Progress
|
2016-03-22
|
2016-05-06
|
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
|
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
|
| 08/06/16 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
|
| 09/06/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 10/06/16 |
100 |
100 |
96 |
100 |
100 |
94 |
100 |
Multiple SRM Test failures: Could not open connection to srm-atlas.gridpp.rl.ac.uk:8443
|
| 11/06/16 |
100 |
100 |
100 |
100 |
100 |
100 |
N/A |
|
| 12/06/16 |
100 |
100 |
100 |
100 |
96 |
100 |
N/A |
Single SRM Test failure: [SRM_INVALID_PATH] No such file or directory
|
| 13/06/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 14/06/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
