Difference between revisions of "Tier1 Operations Report 2016-03-23"

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* 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.
 
* 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 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.
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* The draining of Castor disk servers 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 follwed up.  
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* The draining of Castor disk servers 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.  
 
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* At Risk on the whole Tier1 next Monday, 14th March, 11:00 - 16:00 while a network reconfiguration is made followed by the firmware update in a pair of network switches. ('''Note:''' The date of this work was updated after the meeting.)
 
 
* 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.
 
* 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.
 
* Decommissioning of "GEN Scratch" storage in Castor.
 
* Decommissioning of "GEN Scratch" storage in Castor.
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! GGUS ID !! Level !! Urgency !! State !! Creation !! Last Update !! VO !! Subject
 
! GGUS ID !! Level !! Urgency !! State !! Creation !! Last Update !! VO !! Subject
 +
|-
 +
| 120350
 +
| Green
 +
| Less Urgent
 +
| In Progress
 +
| 2016-03-22
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| 2016-03-22
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| LSST
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| Enable LSST at RAL
 
|-
 
|-
 
| 120307
 
| 120307
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| In Progress
 
| In Progress
 
| 2016-03-01
 
| 2016-03-01
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| 2016-03-08
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| 2016-03-22
 
| LHCb
 
| LHCb
 
| HTTP support for lcgcadm04.gridpp.rl.ac.uk
 
| HTTP support for lcgcadm04.gridpp.rl.ac.uk

Latest revision as of 21:43, 22 March 2016

RAL Tier1 Operations Report for 23rd March 2016

Review of Issues during the week 16th to 23rd March 2016.
  • Security updates have been rolled out. There an outage of Castor last Thursday during which all the component servers were successfully updated and rebooted within the announced downtime. During this time job starts were blocked on the batch farm. Various batch farm nodes (Condor masters etc) were also rebooted at this time and there was a confusion that led to batch jobs not being re-allowed to start until later that evening.
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 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
  • GDSS620 (GenTape - D0T1) Reported a read-only file system on the 15th March and was taken out of production. Two T2K files that were not yet copied to tape were corrupt and have been reported as lost. Work still ongoing.
Notable Changes made since the last meeting.
  • Firmware updates were carried out on Monday (21st) on the RAID cards in the "Clustervision '11" batch of worker nodes that are in D1T0 service classes.
  • Patching and rebooting for security updates.
  • A load balancer has been brought partly into service in front of the Test FTS3 instance.
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.
  • Decommissioning of "GEN Scratch" storage in Castor.

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*10Gbit.
  • Fabric
    • Firmware updates on remaining EMC disk arrays (Castor, LFC)
  • Grid Services
    • A Load Balancer (HAProxy) will be used in front of the FTS service.
Entries in GOC DB starting since the last report.
Service Scheduled? Outage/At Risk Start End Duration Reason
All Castor SCHEDULED OUTAGE 17/03/2016 09:30 17/03/2016 13:38 4 hours and 8 minutes Downtime on RAL Storage for security updates
Open GGUS Tickets (Snapshot during morning of meeting)
GGUS ID Level Urgency State Creation Last Update VO Subject
120350 Green Less Urgent In Progress 2016-03-22 2016-03-22 LSST Enable LSST at RAL
120307 Green Less Urgent Waiting Reply 2016-03-21 2016-03-21 Atlas Can't find FTS log.
119841 Green Less Urgent In Progress 2016-03-01 2016-03-22 LHCb HTTP support for lcgcadm04.gridpp.rl.ac.uk
117683 Green Less Urgent In Progress 2015-11-18 2016-02-17 CASTOR at RAL not publishing GLUE 2
Availability Report

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
16/03/16 100 100 100 100 100 100 100
17/03/16 82.3 100 77 83 83 100 92 Mainly Castor outage for security update/reboot.
18/03/16 100 100 100 97 100 100 100 ARC CE jobs held.
19/03/16 100 100 100 100 100 98 100
20/03/16 100 100 100 58 100 98 N/A Problems running CE tests across CMS sites.
21/03/16 100 100 99 100 100 93 100 Single SRM test failure on GET (User timeout).
22/03/16 100 100 100 100 100 100 100
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