RAL Tier1 Operations Report for 1st Octomber 2014
| Review of Issues during the week 24th September to 1st October 2014.
|
- There were problems with the Atlas Castor instance over the weekend which was linked to the draining of a disk server.
- There were problems with the SAM tests on the CEs from Tuesday through to Wednesday. Believed due to a problem in one of the site BDIIs.
| Resolved Disk Server Issues
|
- GDSS763 (AtlasDataDisk - D1T0) failed during Saturday evening. It was restarted and tested but no fault found. The system was returned to service yesterday (30th Sep).
- GDSS720 (AtlasDataDisk - D1T0) was reported as having had problems (and being returned to service) in last week's report. This server has suffered four failures in the last 14 months and is being drained pending further investigation.
| Current operational status and issues
|
- We are investigating why the Atlas Frontier systems had problems using the new Cronos database.
| Ongoing Disk Server Issues
|
| Notable Changes made this last week.
|
- One batch of worker nodes (64 machines) have had Linux cgroups configured to enforce memory limits. (Before it was just advisory).
- Assorted system (Linux) updates.
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| arc-ce02, arc-ce03, arc-ce04
|
SCHEDULED
|
WARNING
|
09/10/2014 10:00
|
09/10/2014 11:00
|
1 hour
|
Upgrade of ARC CEs to version 4.2.0
|
| arc-ce01
|
SCHEDULED
|
WARNING
|
07/10/2014 10:00
|
07/10/2014 11:00
|
1 hour
|
Upgrade of ARC CE to version 4.2.0
|
| Advanced warning for other interventions
|
| The following items are being discussed and are still to be formally scheduled and announced.
|
- The rollout of the RIP protocol to the Tier1 routers still has to be completed.
- Access to the Cream CEs will be withdrawn apart from leaving access for ALICE. The proposed date for this is Tuesday
30th September.
Listing by category:
- Databases:
- Apply latest Oracle patches (PSU) to the production database systems (Castor, LFC).
- A new database (Oracle RAC) has been set-up to host the Atlas3D database. This is updated from CERN via Oracle GoldenGate.
- Switch LFC/3D to new Database Infrastructure.
- Castor:
- Update Castor headnodes to SL6.
- Fix discrepancies were found in some of the Castor database tables and columns. (The issue has no operational impact.)
- Networking:
- Move switches connecting the 2011 disk servers batches onto the Tier1 mesh network.
- Make routing changes to allow the removal of the UKLight Router.
- Enable the RIP protocol for updating routing tables on the Tier1 routers.
- Fabric
- Migration of data to new T10KD tapes. (Migration of CMS from 'B' to 'D' tapes underway; migration of GEN from 'A' to 'D' tapes to follow.)
- 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 (Expected first quarter 2015).
| Entries in GOC DB starting between the 24th September and 1st October 2014.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Whole Site
|
SCHEDULED
|
WARNING
|
01/10/2014 10:00
|
01/10/2014 12:00
|
2 hours
|
RAL Tier1 site in warning state due to UPS/generator test.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 108944
|
Green
|
Urgent
|
In Progress
|
2014-10-01
|
2014-10-01
|
CMS
|
AAA access test failing at T1_UK_RAL
|
| 108886
|
Green
|
Less Urgent
|
In Progress
|
2014-09-29
|
2014-09-30
|
dteam
|
RAL stratum one, cernvmfs.gridpp. connections
|
| 108845
|
Green
|
Urgent
|
In Progress
|
2014-09-27
|
2014-09-30
|
Atlas
|
RAL-LCG2: Source connection timeout plus globus_ftp_client error
|
| 108546
|
Yellow
|
Less Urgent
|
In Progress
|
2014-09-16
|
2014-09-22
|
Atlas
|
RAL-LCG2_HIMEM_SL6: production jobs failed
|
| 107935
|
Red
|
Less Urgent
|
In Progress
|
2014-08-27
|
2014-09-02
|
Atlas
|
BDII vs SRM inconsistent storage capacity numbers
|
| 107880
|
Red
|
Less Urgent
|
In Progress
|
2014-08-26
|
2014-09-02
|
SNO+
|
srmcp failure
|
| 106324
|
Red
|
Urgent
|
In Progress
|
2014-06-18
|
2014-09-23
|
CMS
|
pilots losing network connections 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
|
| 24/09/14 |
100 |
100 |
100 |
100 |
100 |
100 |
99 |
|
| 25/09/14 |
100 |
100 |
100 |
100 |
100 |
99 |
100 |
|
| 26/09/14 |
100 |
100 |
93.5 |
100 |
100 |
98 |
98 |
Problems with Atlas Castor instance (triggered by draining).
|
| 27/09/14 |
100 |
100 |
86.1 |
100 |
100 |
92 |
n/a |
Problems with Atlas Castor instance (triggered by draining).
|
| 28/09/14 |
100 |
100 |
85.9 |
100 |
100 |
93 |
n/a |
Problems with Atlas Castor instance (triggered by draining).
|
| 29/09/14 |
100 |
100 |
97.9 |
100 |
100 |
97 |
n/a |
Atlas test failure.
|
| 30/09/14 |
94.6 |
100 |
100 |
95.5 |
100 |
98 |
n/a |
Multiple CE test failures. Possibly due to problem on one of our site BDIIs.
|
