RAL Tier1 Operations Report for 12th November 2014
| Review of Issues during the week 5th to 12th November 2014.
|
- Over the weekend there was a hardware problem on one of the database nodes behind the Atlas 3D/Frontier service. The Oracle RAC continued to function correctly using the other available nodes and there was no impact on the service.
| Resolved Disk Server Issues
|
| Current operational status and issues
|
- Some problems on Atlas Castor instance. At various times in the last couple of weeks the Atlas workload has led to differing groups of disk servers spending a lot of time in a "wait i/o" state. This is triggered by the numbers of reads using xroot and has led to some SAM test failures.
| Ongoing Disk Server Issues
|
| Notable Changes made this last week.
|
- Doubled the uplink (10 -> 20Gbit) for the network stack used by the Tape servers serving the T10000B & C drives. The existing link was at full capacity.
- Grid Service updates: BDIIs updated to EMI 3 update 21; LB nodes updated to EMI 3 update 21; LFC updated to EMI 3 update 16.
- OS Errata rolled out to Castor GEN instance (headnodes & disk servers) this morning (12th Nov).
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Atlas, CMS & LHCb Castor instances (srm-atlas, srm-cms, srm-lhcb)
|
SCHEDULED
|
WARNING
|
19/11/2014 11:00
|
19/11/2014 12:00
|
1 hour
|
Warning on Castor Atlas, CMS and LHCb instance during application of OS errata updates.
|
| Castor GEN instance
|
SCHEDULED
|
WARNING
|
12/11/2014 11:00
|
12/11/2014 12:00
|
1 hour
|
Warning on Castor GEN instance during application of OS errata updates.
|
| 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.
- First quarter 2015: Circuit testing of the remaining (i.e. non-UPS) circuits in the machine room.(Provisional dates: week 12-16 January).
Listing by category:
- Databases:
- A new database (Oracle RAC) has been set-up to host the Atlas 3D database. This is updated from CERN via Oracle GoldenGate. This system is yet to be brought into use. (Currently Atlas 3D/Frontier still uses the OGMA datase system, although this was also changed to update from CERN using Oracle Golden Gate.)
- 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 5th and 12th November 2014.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Castor GEN instance
|
SCHEDULED
|
WARNING
|
12/11/2014 11:00
|
12/11/2014 12:00
|
1 hour
|
Warning on Castor GEN instance during application of OS errata updates.
|
| Whole site.
|
UNSCHEDULED
|
WARNING
|
05/11/2014 09:00
|
05/11/2014 10:00
|
1 hour
|
Putting site At Risk for a reboot of network router. Anticipate only two very short (few seconds) break in connectivity.
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 110079
|
Green
|
Very Urgent
|
In Progress
|
2014-11-12
|
2014-11-12
|
T2K
|
ARC CEs no longer accepting jobs from WMS
|
| 110028
|
Green
|
Less Urgent
|
Waiting for Reply
|
2014-11-10
|
2014-11-11
|
CMS
|
Phedex transfer problems from T1_UK_RAL_Buffer
|
| 109712
|
Green
|
Urgent
|
On Hold
|
2014-10-29
|
2014-11-10
|
CMS
|
Glexec exited with status 203; ...
|
| 109694
|
Green
|
Urgent
|
On hold
|
2014-11-03
|
2014-11-06
|
SNO+
|
gfal-copy failing for files at RAL
|
| 108944
|
Yellow
|
Urgent
|
On Hold
|
2014-10-01
|
2014-11-03
|
CMS
|
AAA access test failing at T1_UK_RAL
|
| 107935
|
Red
|
Less Urgent
|
On Hold
|
2014-08-27
|
2014-11-03
|
Atlas
|
BDII vs SRM inconsistent storage capacity numbers
|
| 106324
|
Red
|
Urgent
|
On Hold
|
2014-06-18
|
2014-10-13
|
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
|
| 05/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 06/11/14 |
100 |
100 |
89.3 |
100 |
100 |
100 |
100 |
Two blocks of test failures (06:00-07:00 & 09:00-10:00) Error 'Handling Timeout'.
|
| 07/11/14 |
100 |
100 |
96.5 |
100 |
100 |
100 |
100 |
Several SRM PUT test failures (timeouts).
|
| 08/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 09/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 10/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
| 11/11/14 |
100 |
100 |
98.3 |
100 |
100 |
100 |
98 |
Two SRM test failures one after the other.
|
