RAL Tier1 Operations Report for 8th October 2014
| Review of Issues during the week 1st to 8th October 2014.
|
- There were problems with the Atlas Castor instance over the weekend which was linked to the draining of a disk server. This was followed by very heavy load experienced by that 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.
- This morning, Wed 1st October, one of the Neptune standby databases crashed. Cause unknown. A Service Request has been opened with Oracle.
| Resolved Disk Server Issues
|
- GDSS707 (AtlasDataDisk - D1T0) failed around 5am on Sunday morning (5th Oct). It was restarted and tested but no fault found. The system was returned to service this morning (8th Oct).
| 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).
- Oracle patches (PSU) applied to the standby Neptune database (Castor Atlas & GEN) yesterday (Tuesday 30th Sep).
- Assorted system (Linux) updates.
- Migration of CMS data from 'B' to 'D' tapes is continuing.
- There was a successful UPS/Generator load test this morning (Wed 1st Oct).
| 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
|
| All Castor (all SRM endpoints)
|
UNSCHEDULED
|
WARNING
|
07/10/2014 15:00
|
08/10/2014 17:00
|
1 day, 2 hours
|
Extending warning while databases running with degraded RAID battery
|
| 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- Access to the Cream CEs will be withdrawn apart from leaving access for ALICE. This was proposed for yesterday (Tuesday 30th September) but has been delayed.
- First quarter 2015: Circuit testing of the remaining (i.e. non-UPS) circuits in the machine room.
Listing by category:
- Databases:
- Apply latest Oracle patches (PSU) to the production database systems (Castor, LFC). (Underway).
- 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 1st and 8th October 2014.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| All Castor (all SRM endpoints)
|
UNSCHEDULED
|
WARNING
|
07/10/2014 15:00
|
08/10/2014 17:00
|
1 day, 2 hours
|
Extending warning while databases running with degraded RAID battery
|
| arc-ce01.gridpp.rl.ac.uk
|
SCHEDULED
|
WARNING
|
07/10/2014 10:00
|
07/10/2014 11:00
|
1 hour
|
Upgrade of ARC CE to version 4.2.0
|
| All Castor (all SRM endpoints)
|
UNSCHEDULED
|
WARNING
|
06/10/2014 17:00
|
07/10/2014 15:00
|
22 hours
|
At risk on all Castor instances due to problems with RAID cache battery on Castor DB RAID arrays
|
| All Castor (all SRM endpoints)
|
UNSCHEDULED
|
OUTAGE
|
06/10/2014 16:00
|
06/10/2014 16:22
|
22 minutes
|
Extending downtime to switch over dataguard for SRM databases
|
| srm-alice.gridpp.rl.ac.uk, srm-atlas.gridpp.rl.ac.uk, srm-biomed.gridpp.rl.ac.uk, srm-dteam.gridpp.rl.ac.uk, srm-hone.gridpp.rl.ac.uk, srm-ilc.gridpp.rl.ac.uk, srm-lhcb.gridpp.rl.ac.uk, srm-mice.gridpp.rl.ac.uk, srm-minos.gridpp.rl.ac.uk, srm-na62.gridpp.rl.ac.uk, srm-pheno.gridpp.rl.ac.uk, srm-snoplus.gridpp.rl.ac.uk, srm-superb.gridpp.rl.ac.uk, srm-t2k.gridpp.rl.ac.uk,
|
UNSCHEDULED
|
OUTAGE
|
06/10/2014 14:30
|
06/10/2014 16:00
|
1 hour and 30 minutes
|
Downtime to switch to failover databases because of hardware failure
|
| 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
|
| 01/10/14 |
67.6 |
100 |
100 |
95.5 |
100 |
100 |
n/a |
Multiple CE test failures. Appear to be due to problem on one of our site BDIIs. (Problem started yesterday).
|
| 02/10/14 |
100 |
100 |
98.1 |
100 |
100 |
97 |
100 |
Two SRM test failures. Both "could not open connection to srm-atlas.gridpp.rl.ac.uk". One approximately coincidental with Oracle PSU upgrade.
|
| 03/10/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 04/10/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 05/10/14 |
100 |
100 |
99.3 |
100 |
100 |
100 |
n/a |
Single SRM test failure
|
| 06/10/14 |
100 |
100 |
78.9 |
100 |
100 |
81 |
91 |
Battery failure in disk array holding Castor databases lead to poor database performance.
|
| 07/10/14 |
100 |
100 |
99.1 |
100 |
100 |
99 |
100 |
Single SRM test failure
|
