RAL Tier1 Operations Report for 23rd March 2016
| Review of Issues during the week 16th to 23rd March 2016.
|
- Security updates have been rolled out. There an outage of Castor last Thursday during which all the component servers were successfully updated and rebooted within the announced downtime. During this time job starts were blocked on the batch farm. Various batch farm nodes (Condor masters etc) were also rebooted at this time and there was a confusion that led to batch jobs not being re-allowed to start until later that evening.
| Resolved Disk Server Issues
|
| 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 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
|
- GDSS620 (GenTape - D0T1) Reported a read-only file system on the 15th March and was taken out of production. Two T2K files that were not yet copied to tape were corrupt and have been reported as lost. Work still ongoing.
| Notable Changes made since the last meeting.
|
- Firmware updates were carried out on Monday (21st) on the RAID cards in the "Clustervision '11" batch of worker nodes that are in D1T0 service classes.
- Patching and rebooting for security updates.
- A load balancer has been brought partly into service in front of the Test FTS3 instance.
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.
- Decommissioning of "GEN Scratch" storage in Castor.
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.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| All Castor
|
SCHEDULED
|
OUTAGE
|
17/03/2016 09:30
|
17/03/2016 13:38
|
4 hours and 8 minutes
|
Downtime on RAL Storage for security updates
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 120350
|
Green
|
Less Urgent
|
In Progress
|
2016-03-22
|
2016-03-22
|
LSST
|
Enable LSST at RAL
|
| 120307
|
Green
|
Less Urgent
|
Waiting Reply
|
2016-03-21
|
2016-03-21
|
Atlas
|
Can't find FTS log.
|
| 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
|
In Progress
|
2015-11-18
|
2016-02-17
|
|
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
|
| 16/03/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 17/03/16 |
82.3 |
100 |
77 |
83 |
83 |
100 |
92 |
Mainly Castor outage for security update/reboot.
|
| 18/03/16 |
100 |
100 |
100 |
97 |
100 |
100 |
100 |
ARC CE jobs held.
|
| 19/03/16 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
|
| 20/03/16 |
100 |
100 |
100 |
58 |
100 |
98 |
N/A |
Problems running CE tests across CMS sites.
|
| 21/03/16 |
100 |
100 |
99 |
100 |
100 |
93 |
100 |
Single SRM test failure on GET (User timeout).
|
| 22/03/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
