RAL Tier1 Operations Report for 24th February 2016
| Review of Issues during the week 17th to 24th February 2016.
|
- Some problems with the Atlas SRMs on Wednesday (17th Feb) - with some SAM tests failing during the evening. Fixed by
restarting the front end processes.
- The traffic on the OPN link this last week was significant but not so as to cause concern.
| Resolved Disk Server Issues
|
- GDSS658 (AtlasScratchDisk - D1T0) reported problems overnight on Thursday/Friday 18/19 Feb. It was taken out of service for a short while on the Friday while it underwent checks.
| 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.
|
- Completed Condor updates (to version 8.4.4) on batches of worker nodes.
- Many Linux errata updates.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Whole Site
|
SCHEDULED
|
WARNING
|
01/03/2016 09:00
|
01/03/2016 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.
|
- The Castor 2.1.15 update will soon be scheduled. We are hopeful of carrying out the Nameserver part of the update (requiring a Castor down) next week.
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 (all SRM endpoints)
|
SCHEDULED
|
WARNING
|
23/02/2016 13:30
|
23/02/2016 16:30
|
3 hours
|
Warning period after glic upgrades.
|
| lcgfts3.gridpp.rl.ac.uk
|
SCHEDULED
|
WARNING
|
23/02/2016 10:30
|
23/02/2016 11:30
|
1 hour
|
Updating the fts3 servers due to glibc updates
|
| All Castor (all SRM endpoints)
|
SCHEDULED
|
OUTAGE
|
23/02/2016 09:30
|
23/02/2016 13:30
|
4 hours
|
Downtime on RAL Storage for glibC updates
|
| 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
|
2016-02-12
|
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
|
2016-02-17
|
|
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...
|
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
|
| 17/02/16 |
100 |
100 |
90 |
100 |
100 |
94 |
100 |
Failed some SRM tests (could not open connection to srm-atlas.gridpp.rl.ac.uk:8443). Fixed by restarting SRM Front end daemons.
|
| 18/02/16 |
100 |
100 |
98 |
100 |
100 |
95 |
100 |
Single SRM Test failure. (could not open connection to srm-atlas.gridpp.rl.ac.uk:8443)
|
| 19/02/16 |
100 |
100 |
100 |
100 |
100 |
92 |
100 |
|
| 20/02/16 |
100 |
100 |
100 |
100 |
100 |
97 |
88 |
|
| 21/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
94 |
|
| 22/02/16 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 23/02/16 |
82.3 |
100 |
84 |
87 |
87 |
100 |
100 |
Outage of Castor for application of security update with all systems rebooted.
|
