RAL Tier1 Operations Report for 28th January 2019
Review of Issues during the week 21st January 2019 to the 28th January 2019.
|
- CPU Efficiencies have improved for CMS (>80%), although it is still fluctuating a lot. ATLAS has still 60 - 70% efficiency, Atlas liaison has investigated, the fluctuations look like mostly a result of a different mix of types of jobs, especially failed jobs and group production, which have a lower efficiency. The overall efficiency is similar, maybe a bit better than this time last year.
Current operational status and issues
|
- The system drive in a disk server for LHCb failed on Thursday afternoon. This was a 14 generation machine (dual purpose for Ceph). The operating system was put on the SSD (to leave other disks for capacity), which is attached to the underside of the motherboard… Fabric is going to perform open heart surgery today to install another disk.
- The disk buffer in front of our new Castor tape instance almost filled up. Currently we don’t know the exact cause but on the 25th January (after several months of working perfectly), the Garbage collection daemon stopped working quickly and properly (clearing only a few files an hour). We have manually been wiping files from the tape buffer to keep space clear while we understand the problem.
- While we were investigating the full buffer we found that NA62 has been writing files to the “disk” endpoint on wlcgTape. This endpoint does not get written to tape and was designed for a small number of functional test files (e.g. SAM tests which get copied in and immediately deleted). There are ~197k files using up 11TB of space that as it currently stands will never be migrated to tape (and if they are not used will be deleted eventually). Most of these files have been written in the last few weeks. Tier-1 manager has started an urgent conversation with NA62 to find out how important these files are.
- ARC-CE04 has stopped working again. We are not sure if this is related to the number of LHCb jobs submitted to this CE or not. We have rolled out an updated version of the software to arc-ce05 for testing, which should fix the problem but at the very least it will mean that the ARC developers will need to look at the error. Unfortunately it is likely to break backward compatibility with some VOs. It would be desirable if we could get LHCb to submit their jobs more evenly across our CEs (currently the ratio is 0:25:25:50 for ARC-CE04[1-4] respectively).
Resolved Castor Disk Server Issues
|
Machine
|
VO
|
DiskPool
|
dxtx
|
Comments
|
-
|
-
|
-
|
-
|
-
|
Ongoing Castor Disk Server Issues
|
Machine
|
VO
|
DiskPool
|
dxtx
|
Comments
|
gdss811
|
LHCb
|
lhcbDst
|
d1t0
|
-
|
Limits on concurrent batch system jobs.
|
Notable Changes made since the last meeting.
|
Entries in GOC DB starting since the last report.
|
Service
|
ID
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
Advanced warning for other interventions
|
The following items are being discussed and are still to be formally scheduled and announced.
|
Listing by category:
- DNS servers will be rolled out within the Tier1 network.
Open
GGUS Tickets (Snapshot taken during morning of the meeting).
|
Request id
|
Affected vo
|
Status
|
Priority
|
Date of creation
|
Last update
|
Type of problem
|
Subject
|
Scope
|
139477
|
ops
|
in progress
|
less urgent
|
01/02/2019
|
04/02/2019
|
Operations
|
[Rod Dashboard] Issue detected : org.nordugrid.ARC-CE-submit-ops@arc-ce04.gridpp.rl.ac.uk
|
EGI
|
139476
|
mice
|
in progress
|
less urgent
|
01/02/2019
|
04/02/2019
|
Other
|
LFC dump
|
EGI
|
139414
|
lhcb
|
in progress
|
very urgent
|
30/01/2019
|
05/02/2019
|
Other
|
Jobs Failed with Segmentation fault at RAL-LCG2
|
WLCG
|
139306
|
dteam
|
in progress
|
less urgent
|
24/01/2019
|
29/01/2019
|
Monitoring
|
perfsonar hosts need updating
|
EGI
|
138891
|
ops
|
on hold
|
less urgent
|
17/12/2018
|
16/01/2019
|
Operations
|
[Rod Dashboard] Issue detected : egi.eu.lowAvailability-/RAL-LCG2@RAL-LCG2_Availability
|
EGI
|
138665
|
mice
|
on hold
|
urgent
|
04/12/2018
|
30/01/2019
|
Middleware
|
Problem accessing LFC at RAL
|
EGI
|
138500
|
cms
|
on hold
|
urgent
|
26/11/2018
|
30/01/2019
|
CMS_Data Transfers
|
Transfers failing from T2_PL_Swierk to RAL
|
WLCG
|
138361
|
t2k.org
|
in progress
|
less urgent
|
19/11/2018
|
31/01/2019
|
Other
|
RAL-LCG2: t2k.org LFC to DFC transition
|
EGI
|
138033
|
atlas
|
in progress
|
urgent
|
01/11/2018
|
31/01/2019
|
Other
|
singularity jobs failing at RAL
|
EGI
|
137897
|
enmr.eu
|
on hold
|
urgent
|
23/10/2018
|
31/01/2019
|
Workload Management
|
enmr.eu accounting at RAL
|
EGI
|
GGUS Tickets Closed Last week
|
Request id
|
Affected vo
|
Status
|
Priority
|
Date of creation
|
Last update
|
Type of problem
|
Subject
|
Scope
|
139328
|
cms
|
solved
|
urgent
|
25/01/2019
|
29/01/2019
|
CMS_Facilities
|
T1_UK_RAL SRM tests failing
|
WLCG
|
139312
|
cms
|
solved
|
urgent
|
25/01/2019
|
29/01/2019
|
CMS_Data Transfers
|
Corrupted files at RAL_Buffer?
|
WLCG
|
139302
|
atlas
|
solved
|
urgent
|
24/01/2019
|
25/01/2019
|
File Transfer
|
RAL: transfer issues between BNL and UK due to a wrong DNS alias?
|
WLCG
|
139245
|
cms
|
solved
|
urgent
|
21/01/2019
|
21/01/2019
|
CMS_Data Transfers
|
Transfers failing from CNAF_Disk to RAL_Buffer
|
WLCG
|
139210
|
cms
|
solved
|
urgent
|
17/01/2019
|
25/01/2019
|
CMS_Data Transfers
|
Transfers failing from CSCS to UCL - issue with RAL FTS
|
WLCG
|
139209
|
cms
|
solved
|
urgent
|
17/01/2019
|
25/01/2019
|
CMS_AAA WAN Access
|
file open error at RAL
|
WLCG
|
139108
|
ops
|
verified
|
less urgent
|
09/01/2019
|
21/01/2019
|
Operations
|
[Rod Dashboard] Issue detected : org.nordugrid.ARC-CE-ARIS@arc-ce04.gridpp.rl.ac.uk
|
EGI
|
Day
|
Atlas
|
Atlas-Echo
|
CMS
|
LHCB
|
Alice
|
OPS
|
Comments
|
2019-01-22
|
100
|
100
|
93
|
100
|
100
|
0
|
Ref GGUS#138891
|
2019-01-23
|
100
|
100
|
92
|
100
|
100
|
-1
|
Ref GGUS#138891
|
2019-01-24
|
100
|
100
|
100
|
100
|
100
|
-1
|
Ref GGUS#138891
|
2019-01-25
|
100
|
100
|
75
|
100
|
100
|
0
|
Ref GGUS#138891
|
2019-01-26
|
100
|
100
|
42
|
100
|
100
|
0
|
Ref GGUS#138891
|
2019-01-27
|
100
|
100
|
57
|
100
|
100
|
0
|
Ref GGUS#138891
|
2019-01-28
|
100
|
100
|
72
|
100
|
100
|
0
|
Ref GGUS#138891
|
2019-01-29
|
100
|
100
|
97
|
100
|
100
|
-1
|
Ref GGUS#138891
|
2019-01-30
|
100
|
100
|
99
|
100
|
100
|
-1
|
Ref GGUS#138891
|
Target Availability for each site is 97.0%
|
Red <90%
|
Orange <97%
|
Day |
Atlas HC |
CMS HC |
Comment
|
2019-01-23 |
100 |
98 |
|
2019-01-24 |
100 |
98 |
|
2019-01-25 |
100 |
98 |
|
2019-01-26 |
100 |
91 |
|
2019-01-27 |
100 |
97 |
|
2019-01-28 |
100 |
93 |
|
2019-01-29 |
100 |
98 |
|
Key: Atlas HC = Atlas HammerCloud (Queue RAL-LCG2_UCORE, Template 841); CMS HC = CMS HammerCloud
|