Difference between revisions of "Tier1 Operations Report 2016-05-04"

From GridPP Wiki
Jump to: navigation, search
()
()
Line 93: Line 93:
 
** Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
 
** Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
 
* Networking:
 
* Networking:
** Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*10Gbit.
+
** Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
 
* Fabric
 
* Fabric
 
** Firmware updates on remaining EMC disk arrays (Castor, LFC)
 
** Firmware updates on remaining EMC disk arrays (Castor, LFC)

Revision as of 13:05, 4 May 2016

RAL Tier1 Operations Report for 4th May 2016

Review of Issues during the week 27th April to 4th May 2016.
  • None
Resolved Disk Server Issues
  • None
Current operational status and issues
  • There is a problem seen by LHCb of a low but persistent rate of failure when copying the results of batch jobs to Castor. There is also a further problem that sometimes occurs when these (failed) writes are attempted to storage at other sites. A recent modification has improved, but not completed fixed this.
  • The intermittent, low-level, load-related packet loss seen over external connections is still being tracked. Likewise we have been working to understand some remaining low level of packet loss seen within a part of our Tier1 network.
  • The draining of Castor disk servers for Atlas is very slow. We need to drain a few old servers to provide spares - this being part of the deployment plan and server lifecycle. This does not yet impact services but is being followed up.
Ongoing Disk Server Issues
  • All three disk servers listed below have failed more than once and are being put through a week long acceptance test.
  • GDSS620 (GenTape - D0T1) was reporting problems and was taken out of production on the 19th April.
  • GDSS635 (AtlasTape - D0T1) failed in the early hours of the 20th April.
  • GDSS619 (GenTape - D0T1) failed on 26th April only a few hours after being put back into service after a previous failure.
Notable Changes made since the last meeting.
  • Tuesday 3rd May: Upgraded FTS3 "test" instance to fts 3.4.3. Production FTS being updated this morning (4th May).
Declared in the GOC DB

None

Advanced warning for other interventions
The following items are being discussed and are still to be formally scheduled and announced.
  • The Castor 2.1.15 update is pending. Testing has shown a database related performance issue which is being followed up. We await successful resolution of that problem and completion of testing before scheduling. Following advice from the developers we will not upgrade the SRMs before the Castor 2.1.15 upgrade.
  • Decommissioning of "GEN Scratch" storage in Castor. (Formally announced by EGI broadcast).

Listing by category:

  • Databases:
    • Switch LFC/3D to new Database Infrastructure.
  • Castor:
    • Update SRMs to new version (includes updating to SL6).
    • Update to Castor version 2.1.15.
    • Migration of data from T10KC to T10KD tapes (Affects Atlas & LHCb data).
  • Networking:
    • Replace the UKLight Router. Then upgrade the 'bypass' link to the RAL border routers to 2*40Gbit.
  • Fabric
    • Firmware updates on remaining EMC disk arrays (Castor, LFC)
  • Grid Services
    • Once the use of the Load Balancer (HAProxy) has been proven for the test FTS service it will be extended to other services.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
lcgfts3.gridpp.rl.ac.uk, SCHEDULED WARNING 04/05/2016 11:00 04/05/2016 12:00 1 hour FTS3 service at risk during upgrade to version 3.4.3.
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
121147 Green Very Urgent Waiting Reply 2016-04-29 2016-04-29 CMS Failures reading files at T1_UK_RAL
120954 Green Less Urgent Waiting Reply 2016-04-21 2016-04-26 LHCb SRM endpoint entry in GOCDB
120920 Green Less Urgent In Progress 2016-04-19 2016-05-03 SNO+ XRootD issues at RAL
120810 Green Urgent On Hold 2016-04-13 2016-04-27 Biomed Decommissioning of SE srm-biomed.gridpp.rl.ac.uk - forbid write access for biomed users
120350 Green Less Urgent In Progress 2016-03-22 2016-04-29 LSST Enable LSST at RAL
119841 Yellow Less Urgent On Hold 2016-03-01 2016-04-26 LHCb HTTP support for lcgcadm04.gridpp.rl.ac.uk
117683 Green Less Urgent On Hold 2015-11-18 2016-04-05 CASTOR at RAL not publishing GLUE 2
Availability Report

Key: Atlas HC = Atlas HammerCloud (Queue ANALY_RAL_SL6, Template 729); CMS HC = CMS HammerCloud

Day OPS Alice Atlas CMS LHCb Atlas HC CMS HC Comment
27/04/16 100 100 100 100 96.0 100 100 Single SRM Test failure on list: [SRM_INVALID_PATH] No such file or directory
28/04/16 100 100 100 100 100 100 100
29/04/16 100 100 100 100 100 100 100
30/04/16 100 100 100 100 96.0 100 N/A Single SRM Test failure on list: [SRM_INVALID_PATH] No such file or directory
01/05/16 100 100 100 100 100 100 100
02/05/16 100 100 100 100 100 100 100
03/05/16 100 100 100 97 100 100 100 No compatible resource found in BDII (Site BDII move taking place).