RAL Tier1 Operations Report for 11th March 2015
| Review of Issues during the week 4th to 11th March 2015.
|
- On Thursday (26th Feb) there was a problem with our Argus server that stopped batch job submission starting for an hour or so.
- A problem was uncovered by LHCb when a particular file could not be read from Castor. A manual fixup enabled access to the file again. However, investigations showed a problem when the file was created a few weeks ago - which was the second occurrence of a rare bug in Castor.
- Five files have been declared lost to CMS. These were all picked up by the checksum checker at various times in the last weeks.
| Resolved Disk Server Issues
|
- GDSS757 (CMSDisk - D1T0) failed again early on Friday morning (27th Feb). As this server has failed multiple times it has been put back readonly and is being drained.
| Current operational status and issues
|
- We are running with a single router connecting the Tier1 network to the site network, rather than a resilient pair.
| Ongoing Disk Server Issues
|
| Notable Changes made this last week.
|
- Removed DNs from FTS3 monitoring messages
- Cap on maximum number of ALICE batch jobs raised from 3500 to 6000.
- A new Stratum-1 system for the cern.ch domain set-up.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Whole site
|
SCHEDULED
|
WARNING
|
11/03/2015 10:30
|
11/03/2015 11:00
|
30 minutes
|
Warning on site access during firmware updates on pair of network switches.
|
| lcgfts3.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
05/03/2015 10:00
|
05/03/2015 12:00
|
2 hours
|
Warning on FTS3 service during upgrade to version v3.2.32
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
05/03/2015 07:45
|
05/03/2015 08:30
|
45 minutes
|
Warning following installation of a replacement network router.
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- Investigate problems on the primary Tier1 router. Discussions with the vendor are ongoing. (Swap with replacement unit planned for tomorrow morning, 5th March).
- Update firmware on resilient pair of switches in the Tier1 network - planned for Wednesday 11th March.
- FTS3 update planned for Thursday 5th March.
Listing by category:
- Databases:
- Switch LFC/3D to new Database Infrastructure.
- Update to Oracle 11.2.0.4
- Castor:
- Update SRMs to new version (includes updating to SL6).
- Fix discrepancies were found in some of the Castor database tables and columns. (The issue has no operational impact.)
- Update Castor to 2.1-14-latest.
- Networking:
- Resolve problems with primary Tier1 Router
- Make routing changes to allow the removal of the UKLight Router.
- Enable the RIP protocol for updating routing tables on the Tier1 routers. (Install patch to Router software).
- Fabric
- Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
| 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
|
| 111856
|
Green
|
Less Urgent
|
Waiting Reply
|
2015-02-19
|
2015-03-03
|
LHCb
|
Stalled LHCb jobs over night
|
| 111699
|
Green
|
Less Urgent
|
In Progress
|
2015-02-10
|
2015-02-27
|
Atlas
|
gLExec hammercloud jobs keep failing at RAL-LCG2 & RALPP
|
| 109694
|
Red
|
Urgent
|
In Progress
|
2014-11-03
|
2015-03-04
|
SNO+
|
gfal-copy failing for files at RAL
|
| 108944
|
Red
|
Urgent
|
Waiting Reply
|
2014-10-01
|
2015-03-03
|
CMS
|
AAA access test failing at T1_UK_RAL
|
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
|
| 04/03/15 |
100 |
100 |
100 |
100 |
100 |
98 |
100 |
|
| 05/03/15 |
100 |
100 |
100 |
100 |
100 |
100 |
99 |
|
| 06/03/15 |
100 |
100 |
96 |
100 |
96 |
98 |
92 |
Tier1 network problem affected tests.
|
| 07/03/15 |
100 |
100 |
100 |
100 |
100 |
98 |
97 |
|
| 08/03/15 |
100 |
100 |
100 |
100 |
100 |
98 |
94 |
|
| 09/03/15 |
100 |
100 |
100 |
100 |
100 |
100 |
93 |
|
| 10/03/15 |
100 |
100 |
100 |
100 |
100 |
98 |
98 |
|
