RAL Tier1 Operations Report for 20th April 2016
| Review of Issues during the week 13th to 20th April 2016.
|
| Resolved Disk Server Issues
|
- GDSS771 (LHCbDst - D1T0) crashed on Saturday (9th April). It has since crashed a number of times. It was put back in service read-only the following day and is being drained ahead of more extensive investigations.
| 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.
- The draining of Castor disk servers for Atlas is very slow. We need to drain a few old servers to provide spares - this being part of the deployment plan and server lifecycle. This does not yet impact services but is being followed up.
| Ongoing Disk Server Issues
|
- GDSS635 (AtlasTape - D0T1) crashed on the 6th April. It is still being worked on. There are no files awaiting migration to tape on the server so this has no impact on file availability.
| Notable Changes made since the last meeting.
|
None
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- The Castor 2.1.15 update is pending. Testing has shown a database related performance issue which is being followed up. We await successful resolution of that problem and completion of testing before scheduling. Following advice from the developers we will not upgrade the SRMs before the Castor 2.1.15 upgrade.
- Decommissioning of "GEN Scratch" storage in Castor. (Formally announced by EGI broadcast).
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
- 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.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 120810
|
Green
|
Urgent
|
In Progress
|
2016-04-13
|
2016-04-13
|
Biomed
|
Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users
|
| 120797
|
Green
|
Top priority
|
In Progress
|
2016-04-12
|
2016-04-14
|
Atlas
|
Downloads failing from gdss612 in RAL-LCG2_SCRATCHDISK "The requested service is not available at the moment"
|
| 120624
|
Green
|
Urgent
|
Waiting Reply
|
2016-04-05
|
2016-04-05
|
CMS
|
Consistency Check for T1_UK_RAL
|
| 120604
|
Red
|
Urgent
|
Reopened
|
2016-04-12
|
2016-04-12
|
Atlas
|
Source file size mismatch at RAL-LCG2 SCRATCHDISK
|
| 120350
|
Green
|
Less Urgent
|
In Progress
|
2016-03-22
|
2016-04-05
|
LSST
|
Enable LSST at RAL
|
| 119841
|
Green
|
Less Urgent
|
In Progress
|
2016-03-01
|
2016-03-22
|
LHCb
|
HTTP support for lcgcadm04.gridpp.rl.ac.uk
|
| 117683
|
Green
|
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 508); CMS HC = CMS HammerCloud
| Day |
OPS |
Alice |
Atlas |
CMS |
LHCb |
Atlas HC |
CMS HC |
Comment
|
| 06/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 07/04/16 |
100 |
100 |
100 |
97 |
100 |
N/A |
100 |
Problem with test submission. Other sites also affected.
|
| 08/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 09/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 10/04/16 |
100 |
100 |
98 |
53 |
96 |
N/A |
100 |
Atlas & LHCb: Single SRM Test failures; CMS: Problem with test submission. Other sites also affected.
|
| 13/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 14/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 15/04/16 |
97.2 |
98 |
100 |
96 |
99 |
N/A |
100 |
Site networking problem.
|
| 16/04/16 |
79.2 |
84 |
92 |
75 |
70 |
N/A |
100 |
Site networking problem - continued.
|
| 17/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 18/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
| 19/04/16 |
100 |
100 |
100 |
100 |
100 |
N/A |
100 |
|
