RAL Tier1 Operations Report for 26th November 2014
| Review of Issues during the week 19th to 26th November 2014.
|
- On the evening of Tuesday 18th, the CMS transfer manager machine (lcgclsf02) failed. The services failed over to the backup. A replacement machine was prepared and put into service that afternoon. The following day the original system was fixed and returned to service.
- In the early hours of Friday 21st Nov. there was a problem of locking sessions in the Castor database that affected CMS & LHCb. Whilst this was transitory the cause has been understood and a fix will be provided in a future version of Castor.
| Resolved Disk Server Issues
|
- GDSS673 (LhcbRawDst - D0T1) had failed during the evening of Friday 14th November. The server was returned to production around midday on Thursday 20th Nov.
| Current operational status and issues
|
- Some problems on Atlas Castor instance. At various times in recent 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.
|
- Latest WMS updates (EMI 3 update 22) applied to WMSs.
- FTS3 upgraded to 3.2.30
- OS Errata updates applied to all Castor systems (apart from GEN instance for which this had already been done).
| 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).
- Castor headnode upgrades to SL6: (Assume 4 hour outage of Castor instance in each case for stager updates).
- Tuesday 2nd Dec - LHCb; Tues 9th Dec - CMS; Wed 10th Dec - Atlas; Wednesday 7th Jan - GEN; Thursday 8th Jan - Nameserver (transparent - at risk)
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 19th and 26th November 2014.
|
| Service
|
Scheduled?
|
Outage/At Risk
|
Start
|
End
|
Duration
|
Reason
|
| Castor (srm endpoints).
|
SCHEDULED
|
WARNING
|
25/11/2014 11:00
|
25/11/2014 12:00
|
1 hour
|
At risk on some castor instances while we deploy errata updates
|
| Whole site
|
UNSCHEDULED
|
WARNING
|
25/11/2014 07:00
|
25/11/2014 08:00
|
1 hour
|
Site warning during firewall configuration change.
|
| lcgfts3.gridpp.rl.ac.uk,
|
SCHEDULED
|
WARNING
|
24/11/2014 10:00
|
24/11/2014 12:00
|
2 hours
|
At risk for FTS3 upgrade to 3.2.30
|
| srm-cms-disk.gridpp, srm-cms.gridpp.rl.ac.uk
|
UNSCHEDULED
|
WARNING
|
20/11/2014 14:00
|
20/11/2014 15:00
|
1 hour
|
At risk while we return a CMS Castor headnode to production
|
| Open GGUS Tickets (Snapshot during morning of meeting)
|
| GGUS ID |
Level |
Urgency |
State |
Creation |
Last Update |
VO |
Subject
|
| 110360
|
Green
|
Less Urgent
|
Waiting for Reply
|
2014-11-25
|
2014-11-25
|
SNO+
|
Jobs failing to load cvmfs data
|
| 110244
|
Green
|
Less Urgent
|
In progress
|
2014-11-19
|
2014-11-24
|
None
|
LFC Webdav support
|
| 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
|
2014-11-24
|
SNO+
|
gfal-copy failing for files at RAL
|
| 109276
|
Green
|
Urgent
|
In Progress
|
2014-11-22
|
2014-11-24
|
CMS
|
Submissions to RAL FTS3 REST interface are failing for some users (re-opened)
|
| 108944
|
Amber
|
Urgent
|
In Progress
|
2014-10-01
|
2014-11-24
|
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
|
| 19/11/14 |
100 |
100 |
98.3 |
92.8 |
100 |
100 |
n/a |
SRM test failures. For CMS there was a general problem affecting multiple sites.
|
| 20/11/14 |
100 |
100 |
99.2 |
99.3 |
100 |
99 |
n/a |
Single SRM test failures.
|
| 21/11/14 |
100 |
100 |
95.8 |
92.4 |
91.7 |
99 |
n/a |
SRM test failures caused by problem of locking sessions in database.
|
| 22/11/14 |
100 |
100 |
100 |
100 |
100 |
100 |
n/a |
|
| 23/11/14 |
100 |
100 |
100 |
100 |
100 |
87 |
95 |
|
| 24/11/14 |
100 |
100 |
100 |
100 |
95.8 |
96 |
n/a |
Single SRM test failure.
|
| 25/11/14 |
100 |
100 |
99.1 |
100 |
100 |
100 |
n/a |
Expired proxy affected Atlas tests for many sites.
|
