RAL Tier1 Operations Report for 17th February 2016
Review of Issues during the week 10th to 17th February 2016.
|
- The OPN link to CERN continues to be busy - although a it less than during this last fortnight.
Resolved Disk Server Issues
|
- GDSS671 (AliceDisk - D1T0) failed on Saturday (13th Feb). Following tests and a disk being replaced it was returned to service on Monday (15th Feb).
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.
|
- Update the repack Castor repack instance from version 2.1.14.13 to 2.1.14.15.
- Ongoing Condor updates (to version 8.4.4) on batches of worker nodes.
Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
Whole Site
|
SCHEDULED
|
WARNING
|
23/02/2016 09:00
|
23/02/2016 12:00
|
3 hours
|
Warning on Site during an infrastucture upgrade.
|
Advanced warning for other interventions
|
The following items are being discussed and are still to be formally scheduled and announced.
|
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Update to Castor version 2.1.15.
- 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*10Gbit.
- Fabric
- Firmware updates on remaining EMC disk arrays (Castor, LFC)
- Grid Services
- A Load Balancer (HAProxy) will be used in front of the FTS service.
Entries in GOC DB starting since the last report.
|
Open GGUS Tickets (Snapshot during morning of meeting)
|
GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
119389
|
Green
|
Urgent
|
Waiting Reply
|
2016-02-05
|
2016-02-15
|
LHCb
|
Data transfer problem to RAL BUFFER
|
118809
|
Yellow
|
Urgent
|
On Hold
|
2016-01-05
|
2016-01-13
|
|
Towards a recommendation on how to configure memory limits for batch jobs
|
117683
|
Green
|
Less Urgent
|
In Progress
|
2015-11-18
|
2016-01-05
|
|
CASTOR at RAL not publishing GLUE 2
|
116864
|
Red
|
Urgent
|
In Progress
|
2015-10-12
|
2016-01-29
|
CMS
|
T1_UK_RAL AAA opening and reading test failing again...
|
109358
|
Green
|
Less Urgent
|
Waiting Reply
|
2015-02-05
|
2016-02-09
|
SNO+
|
RAL WMS unavailable
|
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
|
10/02/16 |
100 |
100 |
100 |
100 |
100 |
97 |
100 |
|
11/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
N/A |
|
12/02/16 |
100 |
100 |
100 |
100 |
100 |
94 |
100 |
|
13/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
N/A |
|
14/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
15/02/16 |
100 |
100 |
97 |
100 |
100 |
93 |
100 |
Single SRM Test failure on Put (could not open connection to srm-atlas.gridpp.rl.ac.uk)
|
16/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|