RAL Tier1 Operations Report for 2nd April 2014
| Review of Issues during the fortnight 19th March to 2nd April 2014.
|
- There was a short (around 5 minute) break in external connectivity to the Tier1 during the morning of Thursday 20th March and again a similar event the following morning.
- There was a failover of an Atlas Castor Database early evening on Tuesday 25th March. The failover triggered a call-out and the database was put back onto its allocated node. The cause is a bug that has been reported to Oracle.
- On Friday, 28th March, we were not running some of the CE SUM tests in a timely manner. It was found that owing to a separate change in the Condor configuration we were no longer prioritising the test jobs. This was fixed.
| Resolved Disk Server Issues
|
- Newly deployed server GDSS721 (LHCbDst - D1T0) was taken back out of service following problems on 20th March. It was put back in production the following day after the problems were traced to errors in the network routing table and fixed.
| Current operational status and issues
|
- There have been problems with the CMS Castor instance in recent weeks. These are triggered by high load. Work is underway to alleviate these problems, in particular servers with faster network connections will be moved into the disk cache in front of CMS_Tape when they become available.
- The Castor Team are now able to reproduce the intermittent failures of Castor access via the SRM that has been reported in recent weeks. Understanding of the problem is significantly adcanced and further investigations are ongoing using the Castor Preprod instance. Ideas for a workaround are being developed.
- As reported before, working with Atlas the file deletion rate was somewhat improved. However, there is still a problem that needs to be understood.
- Around 50 files in tape backed service classes (mainly in GEN) have been found not to have migrated to tape. This is under investigation. The cause for some of these is understood (a bad tape at time of migration).
- Problems with the infrastructure used to host many of our non-Catsor services have largely been worked around, although not yet fixed. Some additional migrations of VMs has been necessary.
| Ongoing Disk Server Issues
|
- GDSS239 (Atlas HotDisk) crashed this morning. This is being investigated.
| Notable Changes made this last fortnight.
|
- The rollout of of WNs updated to the EMI-3 version of WN continues and is expected to be completed this week.
- The EMI3 Argus server is being rolled out for use across all CEs and WNs.
- The old MyProxy server (lcgrbp01.gridpp.rl.ac.uk) has just been turned off today. Its replacement (myproxy.gridpp.rl.ac.uk) is in production.
- The 2013 purchases of worker nodes are being added to the farm this week.
- Two of the CV2013 disk servers (120TB each) have been added to LHCbDst. A further 9 are being added today. Three further servers are in CMS non-prod awaiting being moved into production imminently.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| srm-lhcb-tape.gridpp.rl.ac.uk
|
UNSCHEDULED
|
WARNING
|
03/04/2014 08:00
|
03/04/2014 09:30
|
1 hour and 30 minutes
|
Warning during further testing of new tape interface (ACSLS),
|
| lcgrbp01.gridpp.rl.ac.uk
|
SCHEDULED
|
OUTAGE
|
02/04/2014 12:00
|
01/05/2014 12:00
|
29 days,
|
System be decommissioned. (Replaced my myproxy.gridpp.rl.ac.uk).
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- The installion of the new Tier1 Routing layer and the change in the way the Tier1 connects to the RAL network is expected to take place in one of the two weeks following Easter.
Listing by category:
- Databases:
- Switch LFC/FTS/3D to new Database Infrastructure.
- Castor:
- Castor 2.1.14 testing is largely complete. (A non-Tier1 production Castor instance was successfully upgraded yesterday, 1st April.) We are starting to look at possible dates for rolling this out (probably around May).
- Networking:
- Update core Tier1 network and change connection to site and OPN including:
- Install new Routing layer for Tier1 & change the way the Tier1 connects to the RAL network.
- These changes will lead to the removal of the UKLight Router.
- Fabric
- We are phasing out the use of the software server used by the small VOs.
- Firmware updates on remaining EMC disk arrays (Castor, FTS/LFC)
- There will be circuit testing of the remaining (i.e. non-UPS) circuits in the machine room during 2014.
| Entries in GOC DB starting between the 19th March and 2nd April 2014.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| lcgrbp01.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
02/04/2014 12:00
|
01/05/2014 12:00
|
29 days,
|
System be decommissioned. (Replaced my myproxy.gridpp.rl.ac.uk).
|
| All Castor endpoints (All SRMs)
|
SCHEDULED
|
WARNING
|
01/04/2014 09:00
|
01/04/2014 11:00
|
2 hours
|
Testing of new interface to the tape library. During this time Castor disk services will remain up but there will be no tape access. Tape recalls will stall. Writes to tape backed service classes will carry on, with files flushed from the disk caches to tape once the testing is completed.
|
| srm-lhcb-tape.gridpp.rl.ac.uk,
|
SCHEDULED
|
OUTAGE
|
01/04/2014 09:00
|
01/04/2014 11:00
|
2 hours
|
Testing of new interface to the tape library. During this time Castor disk services will remain up but there will be no tape access. Tape recalls will stall. Writes to tape backed service classes will carry on, with files flushed from the disk caches to tape once the testing is completed.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 102902
|
Green
|
Urgent
|
In Progress
|
2014-04-01
|
2014-04-02
|
MICE & NA62
|
Stale .cvmfswhitelist file MICE VO
|
| 102611
|
Green
|
Urgent
|
In Progress
|
2014-03-24
|
2014-03-24
|
|
NAGIOS *eu.egi.sec.Argus-EMI-1* failed on argusngi.gridpp.rl.ac.uk@RAL-LCG2
|
| 101968
|
Yellow
|
Less Urgent
|
On Hold
|
2014-03-11
|
2014-0-01
|
Atlas
|
RAL-LCG2_SCRATCHDISK: One dataset to delete is causing 1379 deletion errors
|
| 101079
|
Red
|
Less Urgent
|
In Progress
|
2014-02-09
|
2014-04-01
|
|
ARC CEs have VOViews with a default SE of "0"
|
| 99556
|
Red
|
Very Urgent
|
On Hold
|
2013-12-06
|
2014-03-21
|
|
NGI Argus requests for NGI_UK
|
| 98249
|
Red
|
Urgent
|
In Progress
|
2013-10-21
|
2014-03-13
|
SNO+
|
please configure cvmfs stratum-0 for SNO+ at RAL T1
|
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
|
| 19/03/14 |
100 |
100 |
100 |
88.6 |
100 |
99 |
73 |
Multiple SRM test failures (load problems).
|
| 20/03/14 |
100 |
100 |
99.7 |
99.6 |
100 |
100 |
n/a |
Atlas: One SRM Test failure; CMS - CE Test failures on all 3 Arc-ce’s (no compatible resources).
|
| 21/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 22/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 23/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 24/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 25/03/14 |
100 |
100 |
99.0 |
89.8 |
100 |
98 |
99 |
Atlas: Castor database problem (Atlas_srm DB moved to another RAC node following a DB crash); CMS SRM SUM test failures separated through day.
|
| 26/03/14 |
100 |
100 |
100 |
87.1 |
100 |
100 |
99 |
Four separate SRM test failures.
|
| 27/03/14 |
100 |
100 |
100 |
96.5 |
100 |
97 |
100 |
Two test failures of SRM Put test.
|
| 28/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 29/03/14 |
100 |
100 |
100 |
100 |
100 |
99 |
100 |
|
| 30/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
99 |
|
| 31/03/14 |
100 |
100 |
100 |
100 |
100 |
100 |
99 |
|
| 01/04/14 |
100 |
100 |
100 |
100 |
100 |
100 |
99 |
|
